ark-stronghold-protocol/docs/SIM.md

SIM.md — battle simulation engine reference (server/sim)

Audience: content authors (kits, bonds, garrisons, items, bands, enemies, bosses, devices, choices) and the match owner who drives Battle. The normative contract is DESIGN.md §5; this file documents the concrete implementation, every hook and helper, the SkillSpec schema with worked examples, the profession defaults and the test harness. Everything here is deterministic: the only randomness is battle.rng().

server/sim/
  Battle.js        one field (normal / unite / boss / hidden) — public API, hook bus, helpers
  constants.js     TICK, MOVE_SCALE, ATTACK_PAUSE, element numbers, tuning knobs
  rng.js           mulberry32 PRNG (+ int/range/chance/pick/shuffle/weighted)
  grid.js          stage grid, tile semantics, 8-dir A* (no corner cutting), obstacles
  units.js         Unit model + stat aggregation
  buffs.js         Buff model, mod keys, status catalogue
  damage.js        damage / heal pipeline, shields, dodge, element gauges
  targeting.js     range grids (rotated by the unit direction), target filters, priorities
  body.js          where a unit can be hit: huge units' hit rectangles — the helper of every range test on enemies
  dir.js           the 4 deploy directions: vectors, rotation, mirror (shared with server/match and browsers)
  projectiles.js   projectile flight & impact
  skills.js        SkillRuntime (SP, charges, triggers, kinds, SkillSpec)
  ai.js            operator attack loop, enemy route following / blocking / attacks
  professions.js   default behaviour per subProfessionId
  snapshot.js      wire format (UnitInfo, snapshot tuples, flags, anim codes)
  simdata.js       data access + normalisation (data/*.json, research fallback)
  content/index.js installContent / setupUnitKit / registerAllMeta
  content/generic.js  generic kit from skill blackboards
  content/kits/tier1..6.js, content/{tokens,bonds,garrisons,items,bands,enemies,bosses,devices,choices}.js  (content phase)

---

1. Driving a battle (match owner)

import { Battle } from './sim/Battle.js';
const b = new Battle({
  seed, kind: 'normal' | 'unite' | 'boss' | 'hidden', modeId, round,
  stageId | stage,              // data/stages.json id or entry
  rect,                         // optional; defaults: normal rows 9–12 × cols 0–10, unite cols 0–20, boss rows 0–5 × cols 0–20
  timeLimit,                    // game seconds (the match passes 2 × the round's combatTimeLimit, which data gives in
                                // real seconds of the forced-2× battle — DESIGN §4); boss/hidden default Infinity (match force-ends)
  players: [PlayerBattleInput], // DESIGN §5.1
  spawns: [SpawnSpec], routes: [RouteSpec],
  sharedBoss,                   // { hp, maxHp, damage(playerId, amount) } or null
  flags: { layerGainsEnabled, dpInit: 10, dpPerSec: 1, dpMax: 99 },
  fieldId,                      // echoed in snapshots
  enemyOverrides,               // waves.json `overrides` ({ [enemyKey]: { stats: {…partial} } })
  // optional: data (DataSource or raw maps), content ('full'|'generic'|'none'), kits ({baseId: kitFn}),
  // extraContent ([{install(battle)}]), setup(battle) (runs after content install, before deployment),
  // recordEvents (default true), autoFinish (default true), logger, quiet, verbose, devices (false = no stage crates)
});
while (!b.finished) b.step();      // 1 TICK = 1/30 game s; live battles run at the forced 2× = 60 ticks per real second
b.snapshot();  b.drainEvents();   // every 3 ticks for watchers (§8.2 wire format)
b.result();                        // BattleResult (DESIGN §5.1) — see §1.3
b.forceEnd('forced' | 'timeout'); // 'timeout' converts remaining enemies to leaks
b.fieldMeta();                     // { fieldId, kind, rect, stageId, units: UnitInfo[] } for m.field

Construction creates every ally unit (not yet deployed) and installs content (kits, then domain modules). The first step() (or b.start()) spawns stage crates, deploys all board units for free — per player the operators top→bottom then left→right (right boss side: right→left in field columns), then the summon pieces the same way (PRTS 卫戍协议/帮助 "按从上到下>从左到右的顺序部署。优先部署干员，随后为召唤物") — firing deploy {initial:true} for each, forces out the operators that enter knocked out (carryState.down, 联防 — §1.1), then fires battleStart. Every summon that came in during the initial deployment (also one an operator's deploy brought along) then ranks after all the operators in the aggro order (unit.aggroSeq, §1.2). On a shared field (联防, the boss field) the players' fields deploy side by side: the i-th operators of all players come in together (in players order), then the summons the same way, and the summons rank after the operators of all players [ASSUMED] (PRTS describes one field — units deploy one after another with a fixed delay from the battle start — and "两处阵地将前后拼接为一处阵地"). Register hooks before the first step (e.g. opts.setup(battle) or right after new Battle).

Tick order: scheduled callbacks → spawns → DP → buffs (+HP regen) → enemies (attack, move, block) → enemy tile index → allies (skill tick, attack) → projectiles → auto-redeploys → boss pool sync → tick hook → release hooks/timers of units removed this tick (§1.4) → time += TICK → end checks.

1.1 Coordinates (PlayerBattleInput units)

units[].row/col are board coordinates (rows 9–12, cols 2–10) unless abs: true (or player coords: 'field'). Mapping:

field	row	col	direction
normal	row	col + colOffset (0)	unit dir (default RIGHT)
unite	row	col + colOffset (0 or 8)	unit dir
boss/hidden, side L	row − 7 when row ≥ 7 (board 9–12 → boss 2–5)	col + colOffset	unit dir
boss/hidden, side R	same	20 − col (mirrored; colOffset ignored)	mirrored: RIGHT ↔ LEFT, UP / DOWN unchanged (battle.mapDir)

rowOffset on the player overrides the boss row mapping. Unit input dir ∈ 'UP'|'RIGHT'|'DOWN'|'LEFT' (the board piece's facing, research 09 §1.2; absent/junk ⇒ RIGHT; with abs / coords:'field' it is a field direction as given). Token pieces: { kind:'token', tokenId, ownerUid, row, col, dir? }.

Facing (DESIGN §3, sim/dir.js). Every ally has unit.dir; unit.fwd = its forward vector [dRow, dCol] (UP [1,0], RIGHT [0,1], DOWN [−1,0], LEFT [0,−1]; row 0 is the bottom). Range grids and every relative offset [dRow, dCol] are authored facing RIGHT and rotated: RIGHT (dr,dc), UP (dc,−dr), LEFT (−dr,−dc), DOWN (−dc,dr) (rotateOffset; the inverse toLocal turns an absolute delta into the unit's frame); rangeExtend adds tiles along +dCol before rotating. unit.facing (±1) survives only as the derived horizontal sign for sprite flipping (a legacy facing = ±1 assignment sets RIGHT / LEFT). Content rules: "身前 k 格" = frontOf(r, c, dir, k) (support.frontTile); "左右两格" = offsetTile(r, c, ±1, 0, dir) (support.sideTiles); kit pushes / pulls use unit.fwd; blowers compare directions (same ⇒ equal, reverse ⇒ opposite, perpendicular ⇒ vertical); board-position rules ("更靠左", "最右边", "同一行最右边") stay board positions in the player's own frame (mirrored FA side: counted from the field's other end), independent of the units' directions. Enemies keep their own horizontal facing logic (content/enemies.js frontGuard). "First tile" tie-breaks relative to a unit (tactical points findTacticalPoint, summon tiles findSummonTile, the 突袭 landing tile) compare offsets in the unit's facing-RIGHT frame (localOrder / localBefore; for a RIGHT unit exactly the old tile-key order), so a rotated layout plays the same (test/sim/facing-invariance.test.js: every chess × 4 directions on an open field). 余 S3's fire wall runs through his tile perpendicular to his direction (his column facing RIGHT / LEFT, his row facing UP / DOWN; fx firewall.axis = 'col'|'row'). carryState: { hpPct, sp, skillActive } restores unite helpers (HP ratio, SP; skillActive restarts a timed skill for a fresh duration/ammo without spending a charge — unitsEnd reports sp: 0 while a skill runs, so pass it through as is). carryState: { down: true } = an operator knocked out at the end of the helper's own combat (PRTS 卫戍协议/帮助 "上一阶段为 退场状态的干员强制退场", user playtest #5 item 2): start() deploys it with everyone (initial deploy fires), then — before battleStart — withdraws it with reason FORCED_EXIT (constants.js 'forcedExit') and HP 0 (the end-of-phase HP ratio, as after kill): it is down on its tile (isDown, b.snap down) with its full redeploy timer and redeploys by the normal rule; no kill hook, no 'killed' death (knock-out effects such as 深海 / 不屈 revives or 崇高牺牲 layers fired in its own combat), no deaths count. Right after battleStart its timer is re-read (deathAt + respawnTime × persist.redeployMul × s.redeployMul), so a redeploy-time effect switched on by a battleStart handler covers it like a later knock-out (机变 征召 −50 %; 征召's row check does not count it [ASSUMED]).

1.2 Enemies, routes, ownership

SpawnSpec = { time, enemyKey, routeIndex, count=1, interval=0, mods:{hpMul,atkMul,defMul,resMul,speedMul}, sourcePlayerId?, bounty?:{coins, ownerPlayerId}, tag?:'boss'|'part'|'escort'|'bounty', ownerPlayerId?, pos?:[r,c], route?:RouteSpec, countInTotal? }. RouteSpec accepts data/waves.json routes ({motion, start, end, checkpoints:[[r,c]…], steps:[{t:'move',p},{t:'wait',s},{t:'disappear'},{t:'appear',p}]}) and research routes ({m, s, e, cp:[['MOVE',r,c]…]}). spawnsFromTemplate(waveEntry, {mods}) (simdata.js) converts a template into { routes, spawns, maxPlayTime, overrides, extraRoutes } (non-spawn action entries are skipped; unharmful and tag:'part' spawns don't count in total).

WALK legs pathfind on the stage grid inside the rect with the official flow field (grid.js: 4-direction SPFA from the destination, crates cost 1000, then Bresenham line-of-sight smoothing — research 08 §3.4). Among equal-length routes the one crossing the fewest non-blockable tiles (floor / gate lanes) wins, and a smoothed segment never cuts across floor the grid route does not walk (user playtest #2 item 2; test/sim/pathing-blockable.test.js). Enemies re-path whenever an obstacle changes (grid.version), after a displacement and when 诱导 ends; the smoothed chain is only line-of-sight clear from a tile centre, so an enemy re-planning off-centre first steps back to its tile centre when the straight line to its first waypoint would cut a tile it cannot walk or a crate (a pushed enemy never clips a fence corner or breaks the decorative crate on it — act1 m03 (11,5); test/sim/pathing.test.js). If crates cut every path the enemy walks through them, gets blocked by the crate and destroys it. FLY legs fly straight between checkpoints. disappear hides the enemy (untargetable, not in snapshots), wait pauses, appear teleports.

Blocking (Battle._checkBlock, official contact rule — PRTS 游戏数据基础 §阻挡半径, 作战机制 "中点判定 … 案例: 阻挡"; user playtest #5 item 4): an unblocked, blockable enemy is blocked by an ally (or device) whose centre is within its block radius of the enemy's position — constants.js BLOCK_RADIUS: ground 0.7071 (compared as d² < 0.49999037, the tile's circumscribed circle), air 0.8944 (blockFly units against flyers), devices 0.4472 — while that blocker has free capacity for the enemy's blockWeight (data blockCnt). It is checked every tick for every unblocked enemy, moving or not: an enemy that overlaps an operator when its blocker dies / is withdrawn / is stunned, or when the operator's blocked enemy dies, is taken over at once; an enemy that finds no room walks on (pass-through). Several blockers in contact → the nearest [ASSUMED]. A head-on enemy therefore stops at contact, ~0.71 tile from the blocker's centre, on the tile in front of it (PRTS 作战机制: a blocked enemy's collider does not enter the blocker's tile; the official few hundredths of a tile of deceleration are not modelled), and a melee blocker (data position MELEE, targeting.js meleeUnit: 要塞 / 领主 / 哨戒铁卫 included) may always target the enemies it blocks, in range or not, and targets them first ("可以选择且优先选择阻挡单位", PRTS 选择器; 索敌的概念 "我方索敌优先级：阻挡（近战限定）" — Battle.blockedTargets, used by ai.js acquireTargets and the skills' DEFAULT trigger, and sortEnemyTargets; "自身这格内" rules name the blocked enemies separately — 瑕光 S2, PRTS 备注). A ranged operator standing on a melee tile blocks, but targets by its range alone: no blocked-first priority, nothing out of range, no DEFAULT cast for the enemy it holds (PRTS 索敌的概念 "远程位干员通常而言不会 优先攻击自己阻挡的目标；甚至如果这个目标被阻挡在该干员的身后…无法攻击到这个敌人").

Enemy attacks: blocked melee enemies hit their blocker; enemies with rangeRadius > 0 and applyWay ≠ MELEE attack allies within the radius (a MELEE enemy only ever hits its blocker — data/enemies.json already zeroes their rangeRadius, the engine enforces it for any source; content may set enemy.profile.melee = false). Target order (targeting.js sortAllyTargets, PRTS 作战机制 索敌 "阻挡→特殊优先级→仇恨值（更容易被攻击→…→最后部署的目标→不容易被攻击）"): its blocker → highest taunt level → latest deployed (aggroSeq = the deploy order: a redeploy or a mid-battle summon is the latest). enemy.profile.canTarget(ally) (content: 萨卡兹枯朽战车 "只攻击位于低地的我方单位，且不会攻击飞行单位", 掠海漂移体 / “萨科塔之眼” 不会攻击飞行单位 …) filters the candidates before the order; a special priority (假想敌：铳 / 昆图斯 highest DEF, 假想敌：胄 highest / lowest ATK, “自在” nearest …) sorts by its key and breaks ties by taunt, then latest deployed (aggroCmp); untargetable / sleeping allies and devices are never targets; a stealthed ally (隐匿 / 迷彩, 排气格栅) only for the enemy it blocks — our operators keep 隐匿 while blocking (PRTS 作战机制 §隐匿; 索敌的概念: a blocked enemy "强行无视对方可选性" attacks its blocker) and pause ATTACK_PAUSE (0.35 s) after each unblocked attack; fear/disarm stop attacks; dmgType 'none' enemies never attack; dmgType 'heal' enemies heal the lowest-HP% enemy in their radius instead. Content can take over an enemy's attack: enemy.profile.deferHit = the engine makes the attack (target, timing, the 'atk' event) but deals no damage — the content's attack handler resolves it (帝国炮火先兆者's shells landing 3 s later, content/enemies.js kitShell); enemy.profile.shot = the 'atk' event's projectile kind ('mortar': no projectile drawn). Crates (stage devices with role crate, 100 HP) are ground obstacles; an enemy forced through one is blocked by it and destroys it. A device is present when data/stages.json says active: true (this wins over the level file's hidden: act1 m02's crates); research stages without active use !hidden. Active platforms/mounds (射击台, act1 m03) [ASSUMED, DATA §15.11] are ground obstacles, and an operator standing on one is elevated (unit.ground = false: never blocks).

Ownership (enemy.ownerId, used for killed/total and leak attribution): ownerPlayerId if given, else the player whose half contains the spawn tile (cols ≥ 11 = right half / player with colOffset 8 or side R). A leak is recorded for the player whose half contains the goal it reached, with sourcePlayerId preserved for unite LP.

1.3 BattleResult

{ time, reason: 'cleared'|'timeout'|'forced', killed, total, errors, unspawned?: [{enemyKey,time,tag}], bossHpLeft?,
  perPlayer: { [playerId]: { killed, total, perfect,
      leaked: [{ enemyKey, mods, lpr, sourcePlayerId, tag, counted, boss?, spawned }],
      layerGains: {bondId: n}, coins, damageDealt, bossDamage, healingDone, deaths,
      unitsEnd: [{ uid, id, defId, hpPct, sp, skillActive, alive }],
      unitStats: [{ id, uid, defId, name, kind, dmg, kills, heal, taken, attacks }] } } }

• cleared: no spawns pending and no enemy alive (or the shared boss pool reached 0). A boss/hidden battle with a sharedBoss ends only when the pool reaches 0 or on forceEnd (DESIGN §5.5) — an emptied field keeps running (the h07_04 pair leader has no wait step and can walk into the objective: the leak costs its lpr, then the field idles while another field may still empty the pool or the match's overtime drain — team LP, from 150 real s — ends it); without a pool (sandboxes, tools) it still ends cleared when empty. timeout: time ≥ timeLimit — every living non-boss enemy becomes a leak; spawns that never happened are dropped from total and listed in unspawned.
• leaked[].counted = false for notCountInTotal/unharmful/boss parts (LP rules: normal rounds count only counted leaks, cap 10; boss rounds use lpr). perfect = no counted leak.
• battleEnd {result} fires before the result is frozen: handlers may still call addLayers/addCoins.

1.4 Robustness

Every content callback (hooks, buffs, timers, kits, projectiles, skill callbacks) runs inside try/catch: the error is logged once per (label, unit, message) into battle.errors and the battle continues. Engine-phase errors (internal:*) are counted separately; after 200 of them the battle force-ends as a timeout. step() never throws.

Guarantees content can rely on (pinned by test/sim/robustness.test.js):

• Re-entrancy. forceEnd() called while a step runs (from any hook/callback) is deferred to the end of the current phase: the remaining phases are skipped, time does not advance and the result is built once (never mutated later). Enemies/units created by hooks during the enemy loop or the buff pass start acting next tick. A skill onEnd that runs because its unit is dying cannot redeploy it (use the death hook). gainSp / dealDamage re-read cost and stats after their spGain / hit hooks.
• Recursion. Hook emits and content callbacks share one nesting counter; deeper than MAX_HOOK_DEPTH (32) the handler/callback is skipped and a hookDepth:* content error is logged (deterministic — no stack overflow). Its message lists the open frames (chain: hit(enemy_x→chess_y) > damaged(chess_y) > …) so the looping pair is named; see the re-entrancy rule in §5. A tripped guard is always a content bug, never a limit to raise.
• Bad numbers. Helpers sanitize their inputs: DP flags and non-boss timeLimit (0/NaN ⇒ 60 s) fall back to defaults; unit rows/cols are coerced to integers (junk ⇒ unit skipped); spawnEnemy mods must be finite ≥ 0 (else ×1), the spawn point is clamped into the rect; spawnDevice/spawnToken/relocate accept only integer in-rect free tiles (spawnToken returns null and leaves nothing behind when the tile is busy, relocate only moves living deployed allies, redeploy {tile} refuses a non-integer / out-of-rect / occupied tile without falling back to the home tile); non-finite hp/stats/duration/extend/addAmmo/addCharge/addLayers/addCoins/spCostMul values are ignored; aggregated stats that overflow (stacked *Mul) fall back to base values; a revive written by a kill handler is clamped to max HP (NaN/≤ 0 ⇒ the unit dies with hp 0); projectiles with non-finite coordinates are re-aimed at their origin; a NaN shared-boss pool shows the boss at full HP and counts 0 damage.
• Runaway content. At most MAX_ALIVE_ENEMIES (600) living enemies per field (spawnEnemy returns null beyond — content must handle it); a SpawnSpec count is capped the same way and time: Infinity spawns are never scheduled.
• Movement. Route legs outside the rect are clamped onto it (h07_01's extra fly route runs along row 6, outside the boss rect: without the clamp the flyer hovered at the border forever). An enemy that gains unblockable/levitate through a plain buff is released by its blocker on its next update.
• Listener hygiene. When a unit is removed for good (enemy killed/leaked, token expired or dead, device destroyed, permanent retreat) its hooks and periodic every timers registered with { owner: unit } are dropped at the end of that step — after its own death/enemyLeak handlers ran; one-shot after callbacks still run. Register global handlers without an owner (or with a longer-lived owner) if they must outlive the unit.

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2. Units

Unit fields: id, side ('ally'|'enemy'), kind ('op'|'token'|'enemy'|'device'), defId, def (normalised), name, ownerId (playerId), uid (board piece), ownerUnit (tokens), x, y (floats; x = col, y = row), tileR, tileC (allies), homeR, homeC (board tile: auto-redeploys land there), dir ('UP'|'RIGHT'|'DOWN'|'LEFT'; getters fwd= forward vector,facing= horizontal sign ±1 for sprites only), hp, alive, deployed, removed, hidden, base {…}, buffs[], rangeKeys / rangeKeySet (current range, absolute tile keysr × 21 + c), baseRangeKeys (initial range, §7.1), extraRangeKeys (content extra targets, battle.setExtraRange), blocking[] (allies), blockedBy (enemies), motion ('WALK'|'FLY' enemies), profile, skill (SkillRuntime), kit, items (itemIds), lpr/mods/tag/bounty/sourcePlayerId (enemies), stats {dmg,kills,heal,taken,attacks}, mem {} and trait {} (free scratch space), persist {redeployMul, …}. Getters: s (aggregated stats), maxHp, atk, hpRatio, sp, spMax, canAct, isFlying, statusFlags (UF bits), dmgType, weight. isFlying = an air unit for every targeting / ground-only rule: motion FLY, or an enemy with flag float (近地悬浮, PRTS 术语释义 "算作空中单位") or levitate (浮空 "变为空中单位"); movement and pathing read motion (a hovering enemy keeps walking the ground path). deploySeq counts deployments (and identifies one: seq === u.deploySeq); aggroSeq is the aggro order (= deploySeq, except the summons of the initial deployment, §1).

Hit areas (body.js, user playtest #5 item 10). A regular enemy is a point: in a grid range when the tile of its position (round(y), round(x)) is a range tile, in a radius when its position is (DESIGN §3). A huge enemy (巨型单位: enemy.hitArea from data/enemies.json hitArea — 假想敌：胄 / 管 / 盐风主教昆图斯 / 阿利斯泰尔 / “萨米的意志”, PRTS "受击判定区域为长4.95、宽2.95的长方形，向上偏移1.0") is hit anywhere on a rectangle w × h tiles centred on its position moved dx columns right / dy rows up: it occupies every tile the rectangle overlaps (bodyKeys — 5 × 3 tiles; PRTS 作战机制 "巨型BOSS单位的每一个占据的格子都可以让其本身通过格子判定"), and radius rules measure to the rectangle (bodyDist, 0 inside) [ASSUMED: PRTS 作战机制 calls collider tests the most common one] — except splash around a struck / marked target, a 中点判定 (PRTS 作战机制 "中点判定…案例：阻挡，酒神1天赋的1.3溅射半径"): enemiesInRadius(x, y, r, true) counts every enemy, a huge one too, by its position (the engine's profession splash and 炮手 aftershocks, and the kits' splash centred on an enemy — 焰影苇草 S3's 灼痕 burst, 新约能天使 火力电台, 仇白 S1 留羽). Its position stays its 判定中心 (projectiles fly to it; its own attacks, and splash centred on it, measure from it); body size plays no part in blocking or movement: every huge leader is 自缚 + 无法被阻挡 (PRTS 天赋; content/bosses.js SELF_BOUND gives it a persistent noMove + unblockable buff at spawn — it stands where it spawns, its route is never walked, so the rectangle stays on the pipe block). Content tests enemies only through the engine queries above or body.js (bodyInKeys, bodyOnTile, bodyInRadius, bodyDist, bodyTileReach; wave-B modules via support/index.js onKeys / inRange), never rangeKeySet.has(tileKey(enemy)); distance-scaled numbers (farther targets take more damage, pull strength), movement, pathing, terrain under the enemy, tile-entry tracking, placement heuristics and the range keys taken from blocked enemies (a huge enemy is never blocked) keep the position.

unit.s (lazy, recomputed after any buff change): maxHp, atk, def, res, aspd, bat, interval, blockCnt, moveSpeed, rangeExtend, baseRangeExtend (its permanent part: persist + never-expiring buffs), massLevel (base + ΣmassFlat, ≥ 0 — unit.weight), maxTargets (+n), taunt, dodgePhys, dodgeArts, defIgnoreFlat/Pct, resIgnoreFlat/Pct, dmgDealtMul, physDealtMul, artsDealtMul, dmgTakenMul, physTakenMul, artsTakenMul, trueTakenMul, elemTakenMul (元素损伤倍率: gauge fills), elementalTakenMul (元素脆弱: 元素伤害), healingDealtMul, healingTakenMul, atkScaleMul, spRecovery, spCostFlat, redeployMul, hpRegen, shield, flags{…}.

Aggregation: ATK/DEF/maxHp = (base + Σflat) × (1 + Σpct) × Πmul; res = clamp((base + ΣresFlat) × ΠresMul, 0, 100); aspd = clamp(base + Σaspd, 10, 600); interval = bat × (1 + ΣbatPct) × 100 / aspd; moveSpeed = (base + ΣmoveFlat) × ΠmoveMul; tiles/s = moveSpeed × MOVE_SCALE (0.5). A maxHp change keeps the HP ratio. Elite stats (module included) come from data.

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3. Buffs, mods, statuses

battle.addBuff(unit, { key, duration=Infinity, refresh='replace'|'extend'|'stack'|'independent'|'keep', stacks, maxStacks, mods, flags, onTick(ctx), interval, onExpire(ctx), onRemove(ctx), tags, shield, shieldHits, persist, visible, data, allowDead })

• replace: new instance replaces the old; extend: keep the longer remaining time, take the new mods; stack: +stacks up to maxStacks, timer reset; independent: separate timers, at most maxStacks alive (oldest dropped); keep: ignore.
• Additive mods scale with stacks (value × stacks), *Mul mods multiply (value ^ stacks).
• onTick({battle, unit, buff, dt}) every tick, or every interval s. persist: true survives death/redeploy.
• shield = HP absorbed (consumed, buff removed when empty); shieldHits = number of damage instances fully negated.
• visible: true emits ['status', id, key, 1/0] client events. battle.removeBuff(unit, key|buff).

Mod keys — additive: atkFlat atkPct defFlat defPct hpFlat hpPct resFlat aspd batPct blockCnt rangeExtend defIgnoreFlat defIgnorePct resIgnoreFlat resIgnorePct dodgePhys dodgeArts spRecoveryFlat maxTargets taunt hpRegen hpRegenRatio spCostFlat moveFlat massFlat (重量 levels: 失重 = massFlat: −1; never edit base.massLevel); multiplicative: atkMul defMul hpMul resMul moveMul dmgDealtMul dmgTakenMul physTakenMul artsTakenMul trueTakenMul elemTakenMul elementalTakenMul healingDealtMul healingTakenMul spRecoveryMul redeployMul atkScaleMul physDealtMul artsDealtMul. A rangeExtend on a persist never-expiring buff is permanent: it also widens the initial range (§7.1). Flags: stun freeze sleep silence disarm stealth invulnerable unblockable levitate fear cold reveal bind noHeal untargetable blockFly noMove noSp burstLock hidden attract float noDisplace (float = 近地悬浮 (an air unit, Unit.isFlying), noDisplace = 失衡免疫 (displace() moves nothing)). taunt: true as a flag counts as +1 taunt level (DESIGN §5.3).

Statuses — battle.applyStatus(target, key, { duration, source, value, force, refresh, point }) (returns true if applied); honours enemy/op immunities (stun, silence, sleep, frozen, levitate, feared) unless force; fires beforeStatus (cancellable; handlers may also change ctx.duration / ctx.value), then applies 抵抗 (resist, below) and the 浮空 weight rule, then statusApplied { source, target, status, duration (final), value, entered } — entered = the target carried no buff of that status before (a refresh / a weaker "取最高" application is not an entry: "进入…时"). Effects follow the official term table (gamedata_const.termDescriptionDict, ba.*). Same-key statuses refresh to the longer duration, except the "同名效果取最高" ones marked strongest below: the strongest value wins, a weaker application never overrides it and, if it outlasts it, resumes when the strong one expires (pass refresh to opt out).

key	effect	value
stun	cannot act / move; a stunned operator blocks nothing (its blocked enemies are released: taken over by another operator in contact with room, else they walk on — §1.2 Blocking)	–
freeze	stun; enemies also RES −15	–
cold	ASPD −30; a 2nd cold while cold ⇒ freeze 3 s (unless frozen-immune)	–
sleep	无敌且无法行动: inactive, untargetable, takes no damage (unless the attacker profile has hitSleep or the damage ignoreSleep), blocks nothing	–
slow	moveMul 1 − value (strongest)	default 0.5
sluggish (停顿)	moveMul 0.2	–
bind (束缚)	cannot move	–
fragile / artsFragile / physFragile / elemFragile	taken ×(1+value) (strongest); elemFragile = 元素脆弱 ("受到的元素伤害提升"): elementalTakenMul, 元素伤害 only — never the gauge	0.3 / 0.3 / 0.3 / 0.2
silence	no skill activation	–
fear (恐惧)	无法被阻挡并四散逃跑: enemy cannot attack, is unblockable (released) and does not advance	–
tremble (战栗)	被阻挡后无法进行普通攻击: no normal attack while blocked (abilities still fire)	–
palsy (麻痹)	each stack cancels one enemy normal attack (max 3, lasts until consumed); refused by 麻痹免疫 (data palsyImmune)	stacks, default 1
disarm	no normal attacks	–
stealth / reveal	untargetable unless blocked (an ally: only the enemy it blocks attacks it) / cancels stealth	–
invulnerable	ignores damage	–
levitate (浮空)	stun + unblockable (unblocks enemies) + 失衡免疫 (noDisplace); an air unit meanwhile (isFlying: melee cannot hit it); half duration on units with (current) massLevel > 3; refused on data flyers (motion FLY) and units already levitated (PRTS 异常效果 "若单位数据上为飞行单位…或是持有浮空异常则Buff取消") — a 近地悬浮 enemy is WALK in its data, so it can be levitated; 浮空 is not one of the 近地悬浮 enemies' drop triggers	–
attract (诱导)	无法被阻挡并向目标位置移动: unblockable (released); the engine walks it (own speed, grid path re-planned on obstacle changes; flyers straight) to opts.point ([r, c] or {x, y}, default the source's tile, clamped to the rect) and keeps it there; stun/bind/sleep stop it; its route re-plans from where it stands when the status ends. A new application moves the point	point
resist (抵抗)	the control statuses of RESIST_STATUSES (晕眩 冻结 寒冷 沉睡 恐惧 战栗 诱导 浮空 束缚 沉默 缴械 停顿 减速) applied to the unit last ×(1 − value); a resisting unit loses one 麻痹 stack every 5 s. 同名效果不叠加 — battle.resistOf(u) = the strongest status: 'resist' buff (never a product): several sources (灵知, 流明, 寒檀, enemy talents) never compound. strongest; a permanent one that survives death is a persist buff with status: 'resist', data: { value }	0.5 (≤ 0.95)
taunt	taunt level +value	1
weaken	atkMul 1 − value (strongest)	0.3
aspdDown	aspd + value (strongest)	−30
defDown / resDown	defMul 1 − value / RES −value (strongest)	0.3 / 20

Unknown keys become a flag buff { [key]: true }. Flags noBlock (blocks nothing) and tremble exist for custom buffs; a custom buff with flags.sleep also blocks nothing and is untargetable/invulnerable like the status.

Element gauges (unit.elem = {burn, neural, apoptosis, erosion, necrosis}; capacity unit.gaugeMax = 1000, enemy leaders (rank BOSS / boss units) 2000): deal { type:'element', element, amount } (fires elementHit first; the gauge gain is amount × dmg.mul × elemTakenMul (元素损伤倍率: "受到的元素损伤提高/降低…") × max(5 %, 1 − 损伤抵抗 / 100), 损伤抵抗 = the target's data epResistance — PRTS 元素 "受到的元素损伤 = 损伤值 × (1 − 损伤抵抗 × 0.01)， 后续可应用元素损伤倍率", with the 5 % floor of DMG_e (PRTS 游戏数据基础 "目标受到元素损伤时也可以使用该公式计算，只需要将 D 值 改为目标的损伤抵抗即可"); elementIntake(unit) in damage.js returns that factor, applied after elementHit). 元素脆弱 never scales it, no gauge decays (EP_RECOVERY_PER_SEC 0), and every enemy in data/enemies.json has 损伤抵抗 0 except 转译基底·α (10); operators have none. Enemies deal ATK × their talent's ep_damage_ratio per hit (content/enemies.js ep). A full gauge bursts with the official effects, which depend on the side hit (constants.js ELEMENT); burst damage is 无来源 (DamageInfo sourceless, PRTS 伤害分类 "无法被追溯伤害来源": no damage-dealt multiplier or penetration of the unit that filled the gauge, and the hit / damaged / fatal hooks see source: null — no attacker-keyed content applies — while the ctx's credit, the stats and the kill keep that unit; target-side reactions with no source condition read source || credit: damage sharing — 圣杯, 盲信之誓, 余音 — and 抵挡 — 星熊 战术装甲, 拉普兰德 日晷, whose "enemy damage" guard is otherwise the source's side):

element	operator hit by enemies (ba.dt.*)	enemy hit by operators ("·我方" ba.dt.*2)
burn 灼燃	1200 arts + RES −20, 10 s lock	7000 元素伤害 + RES −20, 10 s lock
neural 神经	stun 10 s, then 1000 true (10 s lock)	3 palsy (none with 麻痹免疫), then 6000 元素伤害, 10 s lock
apoptosis 凋亡	15 s: 阻回 (noSp: no SP gain of any kind, skills.js) + 静默 (no skill activation), −1 SP/s, 100 arts/s	15 s: 50 % weaken recovering over the burst, 800 元素伤害/s
erosion 侵蚀	permanent DEF −100 (stacking erosionDown) then 800 phys, 10 s lock	permanent DEF −120 then 5000 元素伤害, 8 s lock
necrosis (legacy spare gauge)	12 s: 100 true/s, ATK −20 %	same

The lock (<el>Burst buff, flag burstLock) is the official 爆发冷却: while it runs NO element of the unit fills or can be recovered (battle.reduceElement(unit, amount, el?) removes nothing) and the bursting gauge shows full; when it ends EVERY gauge of the unit resets to 0. A burst that is still resolving counts as locked too (unit.burstPending[el], burstLocked(unit) in damage.js — it takes no element): the elementBurst hook fires before the lock buff exists, so fills of that unit are refused until the burst has resolved — an elementBurst handler that spreads the element to neighbours (淤困 parasite) cannot bounce it back into a second burst. elementView(u, now) (damage.js) is the one gauge a unit shows (b.snap elem, §9): the fullest one, ties by the official element id (constants.js ELEMENT_ORDER: 神经, 侵蚀, 灼燃, 凋亡, then the legacy necrosis); during a 爆发冷却 the bursting element with fill 1 and the cooldown's end. 元素伤害 (element HP damage, e.g. "每秒受到…元素伤害") is the DamageInfo type 'elemental' (+ optional element for the client colour): no DEF/RES/dodge — 元素抗性 instead (the target's data epDamageResistance, max(A × (1 − D/100), 5 %A), PRTS 游戏数据基础 DMG_e; 0 on every enemy in data/enemies.json) —, × source dmgDealtMul × target elementalTakenMul (元素脆弱) only — the target's dmgTakenMul (脆弱, ba.fragile "受到的物理、法术、真实伤害提升", and the other "受到的伤害±" effects [ASSUMED: they share that multiplier]) does not scale it —, shields absorb it. An element fill on a target with no HP left is refused (damage.js hasHp: a lethal hit's damaged hook runs before battle.kill, while the target is still alive at 0 HP — no burst on the corpse). Element healing (battle.reduceElement(unit, amount, el?)) lowers element el, or every element type, each by amount on its own (PRTS 菲莱 备注: 清除元素损伤 = "一次等同于自身最大元素值的全类型元素 损伤治疗").

---

4. Damage & heal pipeline

battle.dealDamage(source, target, dmg) → HP removed. DamageInfo = { amount, type:'phys'|'arts'|'true'|'elemental'|'element', element?, defIgnoreFlat, defIgnorePct, resIgnoreFlat, resIgnorePct, mul=1, canDodge (phys/arts), isSkill, isSplash, isAttack, attackId, ignoreSleep, sourceless, tags[], cancel } (sourceless: 无来源 damage — the source's stats add nothing and the hooks get source: null plus credit = the source, which keeps the stats and the kill; a loseHp whose from is 无来源 is 无来源 too) (battle.makeDamage(d) normalises). attackId is the same for every damage instance of one normal attack (all targets, splash, chain, projectile impacts; 0 for non-attack damage) — use it for "本次攻击" procs that must roll once per attack. Dodge from several buffs rolls independently: the unit's s.dodgePhys = 1 − Π(1 − pᵢ) (a single source keeps its exact value). Order: invulnerable / asleep? → hit (mutate dmg, set dmg.cancel) → dodge (rng()) → mitigation (phys max(A − max(0, D×(1−defIgnorePct) − defIgnoreFlat), 5 %A), arts max(A×(1 − R′/100), 5 %A), elemental max(A×(1 − 元素抗性/100), 5 %A), true = A; source ignore mods are added) → × source dmgDealtMul (× phys/artsDealtMul) × target dmgTakenMul (not for elemental) × type-taken mul × dmg.mul (a sourceless hit skips every source term) → shields → HP loss (boss units: routed to sharedBoss.damage(playerId, amount)) → if HP ≤ 0: fatal (ctx.prevented = true keeps the unit at ≥ 1 HP) → damaged → SP-on-hurt / TAKE_DAMAGE → kill + death.

battle.heal(source, target, amount, { overheal=false, self, silent }): no-op on noHeal targets (unless self); × source healingDealtMul × target healingTakenMul; heal hook (mutable amount); capped at max HP; overheal turns the excess into an overheal shield. battle.loseHp(target, amount, {source}) = HP loss ignoring DEF/RES/shields/dodge (流失).

---

5. Hook bus

battle.on(name, fn(ctx, battle), { priority=0, owner, once }) → handle; handlers run in descending priority, then registration order. battle.off(handle) / battle.off(name, fn) / battle.offOwner(owner) (also cancels timers); battle.emit(name, ctx) (custom events allowed); ctx.stopPropagation = true stops later handlers.

name	ctx	notes
battleStart	{}	after the initial deployment
deploy	{ unit, initial }	ops/tokens (initial & redeploy), enemies (initial:false), devices
tick	{ dt }	end of every tick
beforeAttack	{ attacker, targets, isSkill, profile }	allies and enemies; replace/filter ctx.targets
attack	{ attacker, targets, isSkill }	an attack/heal was performed (projectiles may still be in flight)
hit	{ source, target, dmg, credit }	before mitigation; mutate dmg (not fired for gauge fills — see elementHit). source may be null (terrain; 无来源 dmg.sourceless bursts, whose credit names the unit credited)
elementHit	{ source, target, dmg }	before a gauge fill (dmg.type === 'element'); mutate dmg.amount/dmg.mul, set dmg.cancel
damaged	{ source, target, amount, type, dmg, credit }	after application (amount may be 0 when shielded); element fills too (with their source); 无来源: source null, credit set
heal	{ source, target, amount, opts }	mutable amount
fatal	{ unit, source, credit, dmg, amount, prevented }	HP would reach 0 — set prevented (substitutes, 不屈, 复活 items)
kill	{ killer, victim }	victim HP reached 0 (a handler may revive by restoring HP)
death	`{ unit, reason:'killed'	'leak'
skillStart / skillEnd	{ unit, skill, reason }	mutate skill.ammoLeft / skill.timeLeft in skillStart
ammoUsed	{ unit, left, skill }	per ammo consumed
spGain	`{ unit, amount, reason:'time'	'attack'
beforeStatus	{ source, target, status, duration, value, cancel }	set cancel (e.g. 浓缩嗅盐)
statusApplied	{ source, target, status, duration, value, entered }	after immunity check; duration = final (after 抵抗 / weight); entered = newly started (not a refresh)
blocked	{ blocker, enemy }	enemy became blocked
enemySpawn / enemyLeak	{ enemy }
elementBurst	{ source, target, element }	before the burst's lock/effects; same-element fills of target are already refused
dodge	{ source, target, dmg }	an attack was dodged
layerGain	{ playerId, bondId, n, reason, source, tile }	mutable n before recording (魔王 +1 …); tile = [r, c] where source stands — or was knocked out this very instant ("被击倒时" gains) — else null (addLayers opts.tile overrides)
merchantPay	{ unit, cost, cancel }	a merchant (行商) is about to pay its periodic DP; change cost or set cancel
battleEnd	{ result }	may still add layer gains / coins

Re-entrancy rule for content. A handler that deals damage from hit/damaged (counters, reflection, sharing, "bonus damage on hit") must not react to its own output or to other reactive damage, or two such effects ping-pong until the nesting guard trips (the guard then skips every nested handler, including kill/death bookkeeping of content). Respond only to dmg.isAttack (normal attacks), tag your damage (tags: ['counter']) and skip tagged damage, or guard with a per-unit flag while dealing it. When the guard trips, the logged error names the open frames (chain: hit(enemy_x→chess_y) > damaged(chess_y) > …).

---

6. Engine helpers (content must use these)

helper	notes
dealDamage(src, tgt, dmg), heal(src, tgt, amount, opts), loseHp(tgt, amount, {source})	§4
applyStatus(tgt, key, {duration, source, value, force, point}), removeStatus(tgt, key), resistOf(unit)	§3
addBuff(unit, buff), removeBuff(unit, key)	§3
`spawnToken(ownerUnit	playerId, tokenId, row, col, { def, stats, hp, duration, untargetable, dir, kit, force, anySource })`
`tokenDef(tokenId, ownerUnit	chessId), producesToken(ownerUnit, tokenId)`
spawnEnemy(enemyKey, { routeIndex, route, pos, mods, tag, sourcePlayerId, ownerPlayerId, bounty, countInTotal, def })	returns the enemy, or null past MAX_ALIVE_ENEMIES; def = inline record (enemies.json shape or normalised) for keys missing from data
spawnDevice(key, row, col, { hp, obstacle, blockCnt, name, def, res, atk, bat, aspd }), setObstacle(r, c, on)	obstacles re-path enemies; spawnDevice returns null outside the rect or on a living unit
isReservedTile(r, c)	true when a living unit stands there or it is the home tile of an ally piece that has not deployed yet / waits to redeploy — summon tile pickers must skip these (findTacticalPoint does)
`addProjectile({ from, target	to:{x,y}, speed, onHit(ctx), visual, source, hitDead })`
unitsInGrid(unit, grid, {side, extend}), alliesInGrid(unit), enemiesInRadius(x, y, r, centre?), alliesInRadius(x, y, r, ownerId?)	grid offsets are relative to facing RIGHT, rotated by unit.dir; enemies by their body (§2 hit areas: a huge enemy on every tile it occupies / within r of its rectangle; centre = splash around a target, a 中点判定 by position)
enemiesInKeys(keys, attacker, profile), blockedTargets(unit, profile)	targetable enemies whose body is on the tiles (a huge one listed once); the enemies a melee unit blocks — always selectable by it (none for a ranged operator on a melee tile, §1.2 Blocking)
allies(ownerId?), aliveEnemies(), unitAt(r, c), unitById(id), tileInfo(r, c), lowestHpAllyInRange(unit)
addLayers(playerId, bondId, n, reason, {source}), addCoins(playerId, n)	layers are a no-op when flags.layerGainsEnabled is false (unite/boss)
getPlayer(playerId)	{ playerId, seat, side, colOffset, mirror, dir (default unit direction: RIGHT, mirrored side LEFT), facing (its sign), bonds (live copy, layers updated by addLayers), bandId, playerEffects, lpForBoss, dp, units }
mapTile(ps, row, col, abs?) / mapDir(ps, dir, abs?)	board → field tile / direction of a player (the FA right-side mirror)
addDp(playerId, n), retreat(unit, {reason, permanent}), relocate(unit, r, c)
redeploy(unit, { free=true, tile, keepSp })	immediate (re)deployment of a dead/retreated ally (full HP, deploy {initial:false}); free: false pays base.cost DP (refused without it); tile: [r, c] lands on that tile once (home unchanged — later redeploys use the board tile; refused when off-rect or occupied, no fallback); keepSp keeps SP/charges (保留技力), restored before deploy fires — 突袭 raids, 阿戈尔 revive in place
refreshRange(unit), setExtraRange(unit, keys), rangeChanged(unit)	rebuild the ranges after changing unit.rangeGrid (流形 copies); extra targetable tiles (absolute keys; merged into every later rebuild until set again; null clears; never in baseRangeKeys): 蕾缪安 wanted, 维娜 S3
displace(enemy, {x, y}, tiles, {force})	push/pull along passable tiles (by motion: FLY in the rect, else ground-passable); heavier (massLevel) enemies move less; nothing for 失衡免疫 (noDisplace: 近地悬浮, 浮空) and leaders; unblocks + re-paths
after(seconds, fn, {owner}), every(seconds, fn, {owner, immediate})	return {cancel()}; fn(battle, sched)
fx(kind, params), rng() (+ rng.int/range/chance/pick/shuffle/weighted)	never use Math.random
forceAttack(unit, targets?, { noAmmo })	an immediate attack with the current profile (hooks, attack SP, a running ammo skill's bullet); noAmmo: true = spends no bullet and emits no ammoUsed (圣约送葬人 extra attack). Returns true when it attacked
findTacticalPoint(unit), groundPathTiles()	tactical point (战术点, tactician 援军 / talent tokens): a free (isReservedTile) walkable tile of the initial range on an enemy ground path first (groundPathTiles: grid paths of every non-FLY route, cached per grid version), then nearest (Chebyshev, rows break ties), then the lowest tile key
effectiveProfile(unit), reduceElement(unit, amount, el?)
battle.grid	tile(r,c) → `{glyph, key, height:'LOW'
battle.data	DataSource: getChess(id, loadout?), getEnemy(key), getToken(id, ownerChessId, ownerLoadout?), getStage(id), getWave(id) (normalised defs; raw record in def.raw; the per-battle loadout view, §12)

---

7. Skills

7.1 Runtime rules (skills.js)

• SP types: time (+s.spRecovery/s), attack (+1 per attack), hurt (+1 per hit taken); starts at initSp; no SP gain while a duration/ammo/toggle skill is active, while stunned, or with the noSp flag. Attack-type SP: attacks made by the skill (the pending "next attack" of an instant/charge skill, every shot of a timed skill including the one that ends it) recover nothing, so a cost-N skill fires every N+1 attacks (AK). Charges (maxChargeTime > 1): SP fills to cost → +1 charge (SP restarts) until charges are full (then SP stays full).
• Triggers (skill.trigger.rule in data): DEFAULT — ready and about to attack/heal and an enemy (heal skills: an injured ally) inside the initial range (unit.baseRangeKeys: its own grid + its permanent rangeExtend — "攻击范围扩大" modules/talents as persist never-expiring rangeExtend buffs; no skill range, no temporary extend, no extra keys) — or, checked every tick, an enemy (flyers included) inside a content trigger range (unit.skill.addTriggerRange(fn), fn(battle, unit) → list of ally units (their current range) or tile-key arrays; returns an unregister fn; not for heal skills: 海嗣 "攻击范围视为自身攻击范围的延伸", 流形); TAKE_DAMAGE — ready and just hit; SP_FULL (ALWAYS) — immediately; CUSTOM_RANGE — an enemy inside trigger.customRangeGrid (rotated by the unit direction like every grid); SEARCH — an enemy inside the INITIAL range, checked every tick (no attack needed; BWIKI "解放者/阵法术师子职业干员 技能1，初始攻击范围内出现敌人后自动释放", research 03 Addendum C1); NEVER (alias MANUAL) — never auto-casts: the kit calls unit.skill.activate(reason) itself; GDGLOW_SKILL_2, MLYSS_WTRMAN and any unknown rule behave like DEFAULT. Units that never attack (bard, phalanx, librator) check DEFAULT every tick. Silence blocks activation. gainSp is ignored while a duration/ammo/toggle skill runs (its bar shows the skill), whatever the reason, and — any reason but 'init' — while the unit has the noSp flag (阻回: "停止并阻止任意形式的技力回复"; the operators' 凋亡 burst, §3).
• Kinds: duration (mods for duration s), ammo (mods until ammo attacks were made, optional duration cap), instant (onStart + optional one-shot attack override applied to the next attack), charges (instant with charges), passive (always on from deployment, no SP), toggle (stays on until death once activated).
• end(): active turns false, then onEnd runs while the skill's mods / range are still applied (finishers and end bursts use the skill's stats and range), then they are removed (kept when onEnd re-activated the skill), then skillEnd fires. onAttack ctx carries noAmmo (set it to true: this attack spends no bullet, no ammoUsed — 流明's free heals).
• Runtime helpers on unit.skill: activate(reason, {free}), end(reason), stop(), addAmmo(n), extend(s), addCharge(n), gainSp(n, reason), addTriggerRange(fn); fields sp, spCost (= floor(base×spCostMul + spCostFlat)), spCostMul, charges, maxCharges, active, timeLeft, ammoLeft, activations, kind, rule, bb.

7.2 Kits

// server/sim/content/kits/tierN.js
export default {
  [baseChessId]: (bb, chess, def) => Kit,   // bb = flattened blackboard of the SELECTED skill (normal Lv4 / elite Lv7)
};                                           // chess = the record as the unit's loadout makes it (simdata loadoutRecord),
                                             // def = normalised def (def.skill = selected skill, def.talents[].bb, def.loadout)
Kit = {
  skill: SkillSpec | null,      // the chess's DEFAULT skill; null ⇒ unit never casts
  skills: { [skillId]: SkillSpec },          // optional: specs of the other selectable skills (DESIGN §16 operator loadout)
  talents: [{ install(battle, unit) {} }],   // hooks with { owner: unit }; check unit.alive in handlers
  trait: { ...profile overrides },           // e.g. { priority: 'lowDef', maxTargets: 2, splashRadius: 1.2 }
  install(battle, unit) {},                  // optional extra per-unit setup (runs under EVERY selected skill)
}

Keys: the data baseId (chess_char_1_01_a, also used for the elite _b), the exact chess id, or the suffix-less id of the DESIGN §5.6 example (chess_char_1_01) — all three are looked up. Missing kit ⇒ content/generic.js builds one from the blackboard (§7.4), so every chess always fights. Operator loadouts (DESIGN §16): the unit's def is getChess(chessId, { skillIndex, moduleId }) of its PlayerBattleInput entry (no loadout fields = the default). The skill spec is kit.skills[selectedSkillId] when authored, else kit.skill only when the selected skill is the default one, else the GENERIC spec of the selected skill (its generic install is chained after the kit's; kit.skillSource = 'skills' | 'generic', absent for the default spec) — talents, trait and install always come from the kit, so keep default-skill logic inside skill (or check unit.skill.id). Under a non-default skill spawnToken refuses summons that skill does not make (琳琅诗怀雅 S1/S3: no 香槟炸弹), and the tokens.js skill-summon fallback (a table of skill summons, e.g. 迷迭香 S3's two 战术装备) runs while the selected skill has the generic spec. Summons: battle.tokenDef(tokenId, unit) / battle.spawnToken(unit, …) resolve the owner's loadout (token skill of that slot: variants[owner].bySkill[i], module attributes: .byModule[id]). Coverage of the selectable skills: node tools/kit-coverage.mjs --missing [--tier N] [--strict].

Element conventions of the kits (user playtest #5 #3; official term dictionary: 元素损伤 = the gauge, 元素伤害 = HP damage):

• 元素损伤 dealt = { type: 'element', element, amount } with the official base: "N%攻击力的…损伤" ⇒ N × ATK at that moment, "伤害N%的…损伤" / "相当于法术伤害N%" ⇒ N × the HP damage just dealt (post-mitigation, damaged ctx.amount). No damage buff or 脆弱 scales it (the attached-to damage already carries them).
• "自身造成的元素损伤提升N%" (菲莱 / 余 PRP-X while blocking, 塑心 RIT-X vs elite / leader) multiplies EVERY element fill of the unit — kit talents, a carried 灼燃维式重锤 — in an elementHit handler (ctx.source === unit ⇒ ctx.dmg.mul *=); a talent-ratio upgrade (盟约·辅助干员 RIT-X ep_damage_ratio_boss) touches its talent only (PRTS 备注).
• "受到的元素损伤±N%" is also an elementHit multiplier (PRTS 元素 "…后续可应用元素损伤倍率提升/降低等效果") — not the mod elemTakenMul (the gauge's generic 元素损伤倍率 in elementIntake, applied after every elementHit handler, so after the 损伤屏障; 元素脆弱 is elementalTakenMul). On operators (菲莱 神河谕使, 哈洛德 我即军营, 纯烬艾雅法拉 火山灰疗愈, and the host of 假想敌：淤困, "受到的元素损伤提高至130%") it runs at priority 20, before the 损伤屏障 (菲莱 S1, 纯烬 S2 at −50: "损伤屏障于伤害计算前、第一天赋后处理"); the enemy-side amplifier 塑心 精神逆构 (×1.2 凋亡 in her range) has no ordering constraint (priority 0 — enemies carry no 损伤屏障).
• Element attached to a damage (a damaged hook: 迭代元素, 灼燃维式重锤, 炎佑, 妮芙 S2, 余 S3 火墙): the hook runs before battle.kill, so a killing blow still sees the target alive at 0 HP — these riders check HP left (damage.js hasHp, boss: pool HP; tier6 elementDmg) and applyElement itself refuses such a target, so nothing bursts on the corpse. 塑心 S2 (安魂的弥撒) is the exception: PRTS "…凋亡损伤生效于当次触发的伤害之前，该造成的凋亡损伤的来源始终为塑心" — a late hit handler (priority −1000, after any cancel), so its 凋亡 lands (and may burst) before the damage; a hit dodged or absorbed after that still carried it [ASSUMED].
• 盟约·辅助干员 迭代元素 (tier6.js pithst): every damage she deals (HP damage > 0; "造成伤害时") attaches ep_damage_ratio × ATK of 神经, then 灼燃, then 凋亡 (PITHST_ELEMENTS); the element applied first bursts, so alone she bursts 神经.

7.3 SkillSpec schema

{
  kind: 'duration'|'ammo'|'instant'|'charges'|'passive'|'toggle',
  duration,              // s (duration kind; optional cap for ammo)
  ammo,                  // attacks (ammo kind)
  spCost, initSp, charges, spType: 'time'|'attack'|'hurt',   // optional overrides of the data values
  trigger: 'DEFAULT' | { rule, grid },                          // optional override
  heal: bool,            // heal-type skill for the DEFAULT trigger (default: unit is a healer)
  mods: { …mod keys },   // buff while active (instant: only during the pending attack)
  flags: { …flags },
  targeting: { maxTargets, rangeGrid, rangeExtend, priority, allInRange, canHitFly },
  attack: { dmgType, atkScale, healScale, splashRadius, splashScale, hits, projectile, maxTargets, dmgMul,
            chain: {count, falloff, radius, sluggish}, heal: {mode, count, falloff}, onHitStatus: {key, duration, value},
            onHit(ctx),                           // once per attack (main target; target may be null for a splash landing)
            onEachHit(ctx) },                     // per victim: main, every splash / chain victim — ctx += { dealt, kind:'main'|'splash'|'chain', isSplash, isChain, main, attackId }
                                                  // (overrides the profession profile while active; profiles may define onEachHit(b, u, victim, hctx) too)
  onStart(ctx), onEnd(ctx) /* mods & range still applied */, onHit(ctx), onAttack(ctx) /* ctx.noAmmo */, onTick(ctx),
}
ctx = { battle, unit, skill, bb, target?, dealt?, heal?, targets?, dt?, reason?, x?, y? }

7.4 Generic kit (content/generic.js)

Kind: PASSIVE (or a free skill without duration/ammo) ⇒ passive; AMMO ⇒ ammo; duration > 0 ⇒ duration; duration < 0 ⇒ ammo if an ammo key exists, toggle only when the text says 持续时间无限 (史尔特尔) — the data also uses −1 for instant/charge skills (塑心, 妮芙, 夕, 流星, 莱恩哈特 …); else instant (charges when maxChargeTime > 1). Keys → spec (stat keys prefer the plain key, attack/targeting keys prefer attack@: 薄绿 hits for attack@atk_scale 1.1, its atk_scale 2.1 is the end burst): atk→atkPct, def→defPct, max_hp→hpPct (values > 5 are flat: 史尔特尔 +5000 HP), attack_speed→aspd, base_attack_time→batPct, magic_resistance→resMul (|v| < 1, "法术抗性+60%") or resFlat, damage_scale→dmgDealtMul, block_cnt→blockCnt, taunt_level→taunt, damage_resistance→dmgTakenMul (1−v), positive hp_recovery_per_sec(_by_max_hp_ratio)→hpRegen(Ratio), sp_recovery_per_sec→spRecoveryFlat, magic_resist_penetrate_fixed→ resIgnoreFlat, def_penetrate_fixed→defIgnoreFlat, ability_range_forward_extend→targeting.rangeExtend, max_target→ targeting.maxTargets, atk_scale→attack.atkScale, heal_scale→attack.healScale, times→attack.hits, attack@range_radius→ attack.splashRadius, trigger_time/ammo→ammo. Text-aware rules: negative atk/def/RES described on enemies debuff the targets (aura over the range while a timed skill runs — 初雪; on hit for bb.duration otherwise — 流星, 莱恩哈特); statuses (stun cold sleep fear sluggish root unmovable, × prob): attack@ keys on hit, plain keys on hit for instant/charges but once at start on ≤ max_target enemies in range for timed skills (小满), a plain stun described "…结束后…晕眩" = self-stun at the end; "立即…造成…" / "技能结束时…造成…" = one AoE burst of the plain atk_scale at start / end (乌尔比安, 薄绿); "额外造成攻击力N%…" is bonus damage, never the attack scale (烛煌); "停止攻击…" (duration skills) ⇒ attack.noAttack (泡泡, 蛇屠箱, 凯瑟琳, 菲莱, 铃兰); "受到攻击时…攻击力/防御力N%的X伤害" ⇒ counter-damage while the skill is active (星熊, 泡泡; 周围 ⇒ AoE, aoe_cd cooldown: 菲莱) via kit.install; a non-healer whose skill "恢复…友方/友军…生命" heals the most injured ally in range on each hit (古米, 瑕光; 所有友军 ⇒ all: 塞雷娅); ep_damage_ratio + "附带…凋亡/灼燃/神经损伤" ⇒ element damage on hit (凋亡 → apoptosis; × damage dealt when the text says "伤害N%的…损伤", else × ATK); "屏障" + shield_max_hp_ratio/hp_ratio ⇒ decaying self shield at start (砾, 新约能天使); "立即流失N%当前生命" ⇒ self HP loss at start (宴, 风丸); hp_ratio + "恢复/回复…生命" ⇒ self heal at start; force ⇒ on-hit displacement (拖拽/hookmaster pull, else push). Passive skills only apply stat mods (timed when the text says "N秒内": 宴 +65 % ATK for 14 s) and the self/counter effects — their scales describe procs that need a kit. Instant skills with mods/targeting but no attack override apply them to the next attack (the skill range is switched in for that attack).

7.5 Worked examples (real operators, numbers from blackboards)

1. Ammo sniper — 隐现 chess_char_1_01_a “解决麻烦” (bb atk 0.8, base_attack_time −0.3, attack@trigger_time 14; text: prefers ranged enemies, less likely to be targeted; talent: +2 ammo after 20 s on field):

chess_char_1_01_a: (bb, chess, def) => ({
  skill: {
    kind: 'ammo', ammo: bb['attack@trigger_time'],
    mods: { atkPct: bb.atk, batPct: bb.base_attack_time, taunt: -1 },
    targeting: { priority: 'ranged' },
  },
  talents: [{ install(battle, unit) {
    const t = def.talents[0].bb;                          // { self_ammo: 2, duration: 20 }
    battle.on('skillStart', ({ unit: u, skill }) => {
      if (u === unit && battle.time - unit.deployedAt >= t.duration) skill.ammoLeft += t.self_ammo;
    }, { owner: unit });
  } }],
}),

2. Duration ATK buff guard — 幽灵鲨 chess_char_2_07_a 肉斩骨断 (bb atk 0.7, stun 10: HP never below 1 during the skill, self-stun 10 s afterwards):

chess_char_2_07_a: (bb) => ({
  skill: {
    kind: 'duration',                                     // duration comes from the data (11 s)
    mods: { atkPct: bb.atk },
    onStart({ battle, unit }) {
      unit.mem.undying = battle.on('fatal', (c) => { if (c.unit === unit) c.prevented = true; }, { owner: unit });
    },
    onEnd({ battle, unit, reason }) {
      battle.off(unit.mem.undying);
      if (reason !== 'death') battle.applyStatus(unit, 'stun', { duration: bb.stun, source: unit });
    },
  },
}),

3. Instant burst caster — 至简 chess_char_3_13_a 神工意匠 (bb atk_scale 1.3, ct 2; next attack 130 % arts, hits twice; 2 charges; the funnel profile already ramps damage on the same target):

chess_char_3_13_a: (bb) => ({
  skill: { kind: 'charges', attack: { atkScale: bb.atk_scale, hits: 2, dmgType: 'arts' } },
}),

An AoE instant (德克萨斯 剑雨, bb stun 2: two hits of 120 % arts around her + stun) uses onStart instead:

onStart({ battle, unit, bb }) {
  for (const e of battle.enemiesInRadius(unit.x, unit.y, 1.5)) for (let i = 0; i < 2; i++) {
    battle.dealDamage(unit, e, { amount: unit.s.atk * 1.2, type: 'arts', isSkill: true });
    battle.applyStatus(e, 'stun', { duration: bb.stun, source: unit });
  }
  battle.addDp(unit.ownerId, 10);
}

4. Healer — 调香师 chess_char_2_14_a 精调 (bb atk 1.8, attack_speed −50, 30 s; the ringhealer profile heals 3 allies):

chess_char_2_14_a: (bb) => ({
  skill: { kind: 'duration', heal: true, mods: { atkPct: bb.atk, aspd: bb.attack_speed } },
}),

and 华法琳 紧急包扎 (charges, bb hp_ratio 0.15: next heal +15 % of the target's max HP if it is below half):

skill: { kind: 'charges', heal: true, attack: { onHit({ battle, unit, target, bb }) {
  if (target && target.hpRatio < 0.5) battle.heal(unit, target, target.s.maxHp * bb.hp_ratio);
} } },

5. Summoner — 赫默 chess_char_2_02_a 医疗无人机 (bb cnt 1: gain a medical drone that heals nearby allies for 10 s):

chess_char_2_02_a: (bb) => ({
  skill: {
    kind: 'instant', trigger: 'SP_FULL',
    onStart({ battle, unit }) {
      for (const k of unit.rangeKeys) {                  // first free walkable tile in range, nearest first
        const r = Math.floor(k / 21), c = k % 21;
        if (!battle.unitAt(r, c) && battle.grid.canStand(r, c, { ranged: true })) {
          battle.spawnToken(unit, 'token_10000_silent_healrb', r, c, { duration: 10 });
          break;
        }
      }
    },
  },
}),

(the drone's stats come from tokens.json variants[chess_char_2_02_a]; it is untargetable and uses the heal profile.)

6. Tank TAKE_DAMAGE — 古米 chess_char_1_10_a 备用军粮 (rule TAKE_DAMAGE, bb heal_scale 1.15: the next attack heals a nearby ally for 115 % ATK):

chess_char_1_10_a: (bb) => ({
  skill: {
    kind: 'instant',                                      // trigger comes from data: TAKE_DAMAGE
    attack: { onHit({ battle, unit }) {
      const ally = battle.alliesInRadius(unit.x, unit.y, 1.5, unit.ownerId).sort((a, b) => a.hpRatio - b.hpRatio)[0];
      if (ally) battle.heal(unit, ally, unit.s.atk * bb.heal_scale);
    } },
  },
}),

7. Bond hook example — 精准 3-tier (bonds.js): members + ranged ops ignore 30 % DEF/RES:

export function install(battle) {
  battle.on('battleStart', () => {
    for (const p of battle.players) {
      const bond = p.bonds.preciShip;
      if (!bond?.active || bond.tier < 2) continue;
      for (const u of p.units) if (u.def.bonds?.includes('preciShip') || u.def.position === 'RANGED')
        battle.addBuff(u, { key: 'bond:preci', persist: true, allowDead: true, mods: { defIgnorePct: 0.3, resIgnorePct: 0.3 } });
    }
  });
}

8. Timed follow-ups — 蕾缪安 chess_char_6_01 S3 礼炮·强制追思 (user playtest #3; bb attack@emit_offset 0.2, dist_1 / dist_2, proj_atk_scale_1 / _2; PRTS S3 note: after the skill ends one bombardment every 0.3 s in lock order on a random point of the 0.4-side square around each lock mark, ATK cached at the end, ≤ 33 in 10 s). Content that unfolds over time chains battle.after callbacks owned by the unit (they run even if it dies later — check what the official text says and bail out yourself); random numbers come from battle.rng, drawn in the unit's facing frame (dir.js rotateOffset) so a turned board plays alike:

const bombard = (battle, unit, locks) => {
  const atk = unit.s.atk, seq = unit.deploySeq;                        // ATK cached at the skill's end
  const n = Math.min(locks.length, Math.floor(10 / 0.3 + 1e-9));        // ≤ 33 shells
  const fire = (i) => {
    if (!(unit.alive && unit.deployed && unit.deploySeq === seq)) return;  // knocked out: no further shell
    const L = markOf(locks[i]);                                         // follows the enemy / stays where it left
    const [oy, ox] = rotateOffset(battle.rng.range(-spread, spread), battle.rng.range(-spread, spread), unit.dir);
    const x = L.x + ox, y = L.y + oy;
    battle.fx('bombardShell', { x, y, id: unit.id, r: d2, t: 0.3, i });  // the renderer drops a shell there
    battle.after(0.3, () => blast(battle, unit, atk, x, y), { owner: unit });   // lands 0.3 s later [ASSUMED]
    if (i + 1 < n) battle.after(0.3, () => fire(i + 1), { owner: unit });
  };
  if (n > 0) fire(0);
};

(blast emits fx 'bombard' at (x, y) and deals proj_atk_scale_1 / _2 × the cached ATK to every enemy within dist_2, once each; the full kit is content/kits/tier6.js lemuen.)

---

8. Professions (server/sim/professions.js)

Profile resolution: PROFESSION_DEFAULTS[profession] → SUB[subProfessionId] → trait tunables (trait text + data trait.bb, elites include module upgrades) → data fields (dmgType / attackKind / projectile / canHitFly / targetPriority) → kit.trait. Defaults: SNIPER ranged phys arrow · CASTER ranged arts bolt · MEDIC ranged heal · SUPPORT ranged arts · TANK/WARRIOR/PIONEER/SPECIAL melee phys (melee cannot hit air units: FLY, 近地悬浮, 浮空 — Unit.isFlying). Skill and talent effects that pick their own victims follow the skill's text and PRTS 备注 (the official per-ability targetMotion, PRTS 选择器, is not in the data): "地面敌人" / "不可对空" ⇒ !e.isFlying (e.g. 隐德来希 S2 血镰, 归溟幽灵鲨 拥抱自我, 琳琅诗怀雅 S3 cash-out, 乌尔比安 S1 捕网 [ASSUMED like 雪雉's]); "可对空" or no note ⇒ air units too (no note = [ASSUMED]: 风丸 折纸生花, 乌尔比安 S3, 缄默德克萨斯 S2, 余 S2, 见行者 S2, 耀骑士临光 不畏苦暗 and the token appear bursts — “耀阳”, 沙之碑, 迷迭香的战术装备's stun, 纸偶). A stun / freeze / sleep from any of them drops a hovering 掠海漂移体 for good. Ranged attacks fly as projectiles (constants.js PROJECTILE_SPEEDS: arrow 14, bolt 11, bomb/lob 8, orb 10, drone 16, enemy 10 tiles/s; boomerang 15 out, 3.75 back = BOOMERANG_RETURN_SPEED, PRTS 跃跃); melee/none hits are instant. Kit-settable profile flags beyond the table: hitSleep (targets and damages sleeping enemies — "可以攻击沉睡的敌人"), onEachHit(b, u, victim, hctx), dmgMul, afterHit, afterAttack, canAttack, hitsFn, priority, blockFly, noHeal, boomerang (the projectile stays 'boomerang' whatever the data's generic ranged projectile says) (see the header of professions.js).

sub	behaviour
fastshot	FLY first; module atk_scale vs FLY
closerange, underminer, primcaster, corecaster, ritualist, summoner, counsellor, pioneer, fearless, fighter, protector, guardian, primprotector, executor, duelist	plain profile (numbers from data; skills/talents via kits). underminer module: weaken 10 % ATK 2 s on hit
longrange	lowest DEF first
aoesniper / splashcaster / blastcaster	splash 1.1 tiles at full damage
bombarder	ground-only splash 1.0 + aftershock(s) at 50 % ATK (bb append_atk_scale / times)
hunter	8 bullets (bb value), ×1.2 ATK (bb atk_scale), reloads 1/s after 1 s without attacking; can't attack when empty
loopshooter	回环射手 (user playtest #3): every attack throws a boomerang (ai.js throwBoomerang, projectile 'boomerang') out to the target at 15 tiles/s — it hits on arrival — and back to the thrower's current position at 3.75 tiles/s without damage (PRTS 跃跃 "投射物飞行速度15，返回时飞行速度3.75"); attacks only while holding it (every boomerang thrown caught — "必须回收全部回旋投掷物才可以进行下一次攻击", unit.trait.boomerangsOut) and with the attack cooldown ready, so the real interval is the longer of the two; a target dead mid-flight is not hit (it still flies to the last position and back); knocked out / withdrawn ⇒ lost, a redeployed thrower holds a fresh one; 跃跃 S2's extra boomerangs share the one flight (cnt hits)
reaperrange	hits every enemy in range; ×1.5 (bb atk_scale) on the trait front grid (or its own line ahead) — both along its direction
chain	chain N (trait text/bb max_target) with −15 % per jump (bb chain.atk_scale), 1.8-tile jumps, sluggish on each hit
funnel	drone damage 20 % → +15 %/hit on the same target → 110 % (bb init/delta/max)
mystic	stores up to 3 (bb times) attacks while idle, fires them all at once
phalanx	no attack & DEF +200 %, RES +20 (bb) while the skill is off; attacks with 1.1 splash while on
physician	heal the lowest HP% injured ally in range (a skill targeting.maxTargets widens any heal profile)
ringhealer	heal 3 allies
chainhealer	heal bounces 3× (−25 %, bb chain.*) within 2.5 tiles
healer (流明)	heal ×0.8 (bb heal_scale) beyond 2 tiles
wandermedic	heal + reduce element gauges by 50 % ATK (bb ep_heal_ratio); also targets uninjured allies with gauge
incantationmedic	arts attack; heals the lowest ally in range for 50 % (bb scale) of damage dealt
slower	sluggish 0.8 s on hit (bb sluggish)
bard	no attack; every second heals allies in range 10 % ATK (bb atk_to_hp_recovery_ratio)
craftsman	melee phys (support devices via kit)
shotprotector	ranged phys, can hit FLY, blocks 3
fortress	melee single target while blocking, ranged 1.0 splash otherwise
unyield / musha / reaper	cannot be healed by others; musha heals itself 50 (bb value) per hit; reaper hits every enemy in range and heals 50 × min(hits, block)
centurion / crusher / pusher	hit every blocked enemy at once
hammer	50 % splash (bb atk_scale_2) to others within 1 tile
instructor	×1.2 (bb atk_scale) vs enemies it doesn't block
librator	no attack & block 0 while the skill is off; ATK +5 %/s up to +200 % (bb atk / max_stack_cnt), reset at skill end; elite module starts at +100 % (bb init_atk)
lord	can hit FLY at range; ×0.8 (bb atk_scale) unless the target is on its tile / the tile in front (along its direction) or blocked by it
sword / swordmaster	2 hits per attack
artsfghter	melee arts
charger	+1 DP (bb cost) per kill
tactician	spawns a 援军 token (70 % HP, 50 % ATK, block 1) on the nearest walkable tile in range at each deployment; ×1.5 vs enemies it blocks
agent / hookmaster	can hit FLY (ranged reach); hook displacement comes from skills (generic: force)
bearer	block 0 while the skill is active
alchemist	ranged lob, can hit FLY
dollkeeper	fatal damage ⇒ substitute for 20 s (bb duration): block 0, doll HP (its own substitute token's stats, else 50 % max HP: 归溟幽灵鲨); swaps back at full HP; dies if the doll dies
geek	loses 1–3 % max HP per second (bb hp_ratio), never lethal on its own
merchant	−3 DP every 3 s (bb cost/interval); retreats when DP runs out
skywalker	can block FLY enemies
stalker	hits every enemy in range; 50 % dodge (bb prob), taunt −1
traper	ranged, ground only

Unknown subprofessions fall back to the profession default (test professions.test.js checks every pool subprofession).

---

9. Wire format (snapshot.js, DESIGN §8.2)

• snapshot() → { fieldId, t, units: [[id, x, y, hp, maxHp, sp, spMax, flags, anim]], dp, killed, total, dps?, boss?, down?, elem? }. sp/spMax show remaining duration/ammo as a draining bar while a timed skill is active. Units in DIE state stay 0.8 s. down: [[id, respawnAt, respawnTime, state]] (only when non-empty) = knocked-out operators waiting to redeploy (Battle.isDown(u): reason 'killed' or FORCED_EXIT (§1.1 carryState down), deployed at least once, a finite respawn timer; state = constants.js DOWN_STATE: 0 counting, 1 timer done / DP short, 2 timer done / own tile taken); elem: [[id, element, fill, cooldownEnd, cooldown]] (only when non-empty) = elementView of every unit with a gauge or a running 爆发冷却 (§3). fieldMeta() lists the knocked-out operators too (a client joining mid-battle shows them; DESIGN §18.3).
• drainEvents() tuples: ['spawn', UnitInfo] (first appearance), ['deploy', id] (every (re)deploy), ['atk', src, tgt, projKind] (none|arrow|bolt|bomb|lob|orb|drone|enemy|boomerang|chain|chainHeal; a boomerang's way back has no event — the renderer flies it back to the thrower at BOOMERANG_RETURN_SPEED; an enemy's profile.shot may name another kind, e.g. mortar for 帝国炮火先兆者, which the renderer does not draw — its fx bombardShell is the shell), ['dmg', tgt, amount, type] (phys|arts|true|burn|neural|necrosis|apoptosis), ['heal', tgt, amount], ['skill', id, 1|0], ['die', id, reason], ['leak', id], ['status', id, key, 1|0], ['fx', kind, x, y, extra], ['layer', playerId, bondId, n], ['bounty', playerId, coins].
• UnitInfo = { id, kind, side, ownerId, defId, name, tier, golden, spine, avatar, x, y, facing, dir, maxHp, motion?, boss?, uid?, skillIndex? } (skillIndex: an ally's equipped skill, DESIGN §16) (dir = the unit direction, allies meaningful, enemies 'RIGHT'; facing = its horizontal sign for sprite flipping) (spine/avatar are asset ids from data).
• flags: UF bits (blocked 1, stunned 2, frozen 4, stealth 8, skill 16, shield 32, invuln 64, cold 128, sleep 256, flying 512); anim: ANIM codes (idle 0, move 1, attack 2, skill 3, die 4, stun 5, deploy 6).

---

10. Testing content (test/helpers/battleHarness.js)

import { test } from 'node:test';
import assert from 'node:assert/strict';
import { makeBattle, chessRec, enemyRec, checkInvariants } from '../helpers/battleHarness.js';

test('隐现 S2: 14 shots then the skill ends', () => {
  const h = makeBattle({
    defs: { enemies: { enemy_dummy: enemyRec({ key: 'enemy_dummy', hp: 1e7, speed: 0 }) } },  // synthetic target
    units: [{ chessId: 'chess_char_1_01_a', row: 10, col: 4 }],                                // board coords
    enemies: [{ key: 'enemy_dummy', pos: [10, 6] }],
    hooks: ['ammoUsed', 'skillEnd'],
  });
  const u = h.unit('chess_char_1_01_a');
  assert.ok(h.runUntil(() => u.skill.activations === 1, 60));
  h.runUntil(() => !u.skill.active, 60);
  assert.equal(h.hooksOf('ammoUsed').length, 14);
  checkInvariants(h.b);
});

makeBattle(opts) options: stageId (default 'flat': synthetic open lanes, gates (9,10)/(12,10), goal (9,2); flat: { rows, crates } to customise) or stage; kind; seed; units (board coords, player p1; each may carry dir: 'UP'|'RIGHT'|'DOWN'|'LEFT', default RIGHT — facing tests: test/sim/facing.test.js, test/sim/facing-invariance.test.js, test/content/facing.test.js) or players; enemies: [{ key, time, route (index | RouteSpec), pos, count, interval, mods, tag, bounty, sourcePlayerId }] or waveTemplate (id or object ⇒ routes, spawns, time limit); routes (flat defaults: 0 walk low gate, 1 walk high gate, 2/3 fly); timeLimit; content ('full'|'generic'|'none'); kits (inject { baseId: kitFn }); defs: { chess, enemies, tokens } (extra/override records; build them with chessRec({...}) / enemyRec({...})); bonds, bandId, playerEffects, flags, sharedBoss, setup(battle), hooks (names to capture; captureNoisy to keep tick/hit/damaged/heal/spGain/ attack contexts), autoFinish (default: true when enemies are scheduled). Harness API: battle/b, step(n), run(seconds), runUntil(pred | seconds, maxSeconds), runToEnd(max), unit(uid | chessId | baseId | id), allies(), enemies(), enemy(key), spawn(key, opts), events / eventsOf(kind) (client tuples), hooks / hooksOf(name) (captured ctx copies with t), result(), snapshot(), invariants(). checkInvariants(b) (no NaN, hp ∈ [0, maxHp], positions inside the rect, SP/charge bounds, finite skill timers, occupancy map in sync with deployed allies, block links, DP, finite projectiles and per-player result counters, no open hook emit between steps), hashOf(v), flatStage(), flatRoutes(kind) are exported too.

Soaks: SIM_FUZZ_N=3000 SIM_FUZZ_CHECK_EVERY=3 node --test test/sim/fuzz.test.js (random real battles) and SIM_CHAOS_N=500 SIM_CHAOS_SEED=<n> node --test --test-name-pattern="chaos fuzz" test/sim/robustness.test.js (content that abuses every helper from every hook with junk numbers; asserts invariants and zero engine errors). Normalised defs from battle.data are deep-frozen (shared by every battle in the process): never mutate bb, def, def.stats or range grids in a kit — copy them ({ ...bb }, grid.map(…)).

Rules for content tests: seed everything, prefer synthetic enemyRec targets for exact numbers, assert on ids (not unit objects), and call checkInvariants at the end. Run: node --test test/sim/*.test.js test/content/*.test.js.

11. Tools

node tools/simrun.mjs --mode mode_multi_normal --round 5 --stage act2autochess_m01 --lineup "角峰@9,7 隐现@10,4 艾丝黛尔*@12,5" --ascii 10 prints a per-unit damage/DPS/kills/heal table (+ ASCII frames: letters = operators, digits = ground enemies per tile, ^ = flyers, ■ = crates). --wave <template>, --seed, --content generic, --hpMul/--atkMul/--speedMul, --time, --bossHp, --json, --events, or a scenario JSON file (see the file header).

12. Data notes (simdata.js)

Defs are normalised from data/*.json (DATA.md) with research JSON as a fallback. Chess: stats {maxHp, atk, def, res, aspd, bat, blockCnt, cost, respawnTime, spRecovery, tauntLevel, massLevel, hpRecoveryPerSec}, rangeGrid, dmgType, attackKind, projectile, canHitFly, targetPriority, trait (text), traitBb, immune (Set), skill {id, name, skillType, durationType, duration, spType, spCost, initSp, maxCharges, rangeGrid, trigger {rule, grid}, bb, description}, talents [{name, description, bb, bbStr, rangeGrid, tokenKey}], raw. Enemy: maxHp, atk, def, res, aspd, bat, rangeRadius, moveSpeed, massLevel, lpr, motion, applyWay, dmgType, immune, tauntLevel, blockCnt, epResistance, epDamageResistance, hpRecoveryPerSec, notCountInTotal, hitArea (huge units only, §2; else null), tags, abilities, skills, talent, raw. Tokens use variants[ownerChessId] (owner-level stats). skcom_withdraw token skills are ignored. Operator loadouts (DESIGN §16, DATA.md §2.2 / §14): getChess(id, { skillIndex, moduleId }) = the def with the selected skill (def.skill, its bb / SP / trigger) and, for elites, the module's stats / trait / talents; def.loadout = the resolved loadout { skillIndex, moduleId, skillIsDefault, moduleIsDefault, isDefault } (illegal choices fall back to the default; cached per loadout; the default loadout is the same object as getChess(id)). getToken(id, ownerChessId, ownerLoadout) = the summon for that owner loadout (bySkill / byModule merged; def.sources ⊆ ['talent', 'skill', 'display'] and def.count of that loadout — [] / ['display']: the owner does not make it). Every Battle gets a per-battle view (withUnitLoadouts: id-only getChess(id) / getToken(id, owner) use the loadout the inputs give that chess id — the first player's when two players of one field differ, view.loadoutConflicts); Battle itself always passes the unit's own loadout (_createAllyFromInput, tokenDef / spawnToken, the dollkeeper substitute), so it is exact. Assumptions taken here (documented choices): element burst numbers for necrosis/apoptosis; unspawned enemies at timeout are dropped (not leaks); geek drain is non-lethal; tactician reinforcement stats; displacement distance 0.5 + 0.5·force; platforms/mounds are ground obstacles that elevate operators; the generic kit maps 凋亡 to apoptosis (侵蚀 has no element key yet — enemy content must pick one); 抵抗 covers the control statuses of RESIST_STATUSES (the official term lists 晕眩/寒冷/ 冻结/恐惧/诱导…, the rest follow the operator kits that grant it) and caps at 0.95; tactical points prefer enemy path tiles.