feedback5: merge O6 — 自选 kits for 黑 and 鸿雪 (with her 打字机); 焰狐龙梓兰's kit and test left out (a collab operator, out of the pool since 8287422); 黑 S3's tests and kit header follow its DEFAULT trigger (「攻击范围改为」); golden: only diy moved

server/sim/content/kits/index.js

@@ -98,6 +98,8 @@ export const OPERATOR_KIT_FILES = Object.freeze([
   'op-zuole.js',
   'op-chyue.js',
   'op-huang.js',
+  'op-shwaz.js',
+  'op-bgsnow.js',
 ]);
 
 /**

server/sim/content/kits/ops/op-bgsnow.js

@@ -0,0 +1,226 @@
+// server/sim/content/kits/ops/op-bgsnow.js — 鸿雪 (char_4055_bgsnow) 自选 operator kit: 6★ 重射手 (狙击), an owned-6★ pick of
+// the tier-5 and tier-6 自选 slots; every skill, both talents, the trait, both modules (ARC-Y 打字机色带, ARC-X 仪式感) at
+// every form, and the kit of her summon “打字机” (token_10026_bgsnow_subbow). Kit contract and the 自选 rules: ../README.md
+// ("How to add an operator (自选)").
+//
+// Forms (data/backups.json units.char_4055_bgsnow): normal = E2 Lv1, skills at rank 4, no module; elite = E2 Lv60, rank 7,
+// the picked module at stage 1 (tier 5) or 3 (tier 6) — the owner's decision of 2026-10-05. Potential 0 [ASSUMED: no
+// account]. Sources: character_table / skill_table / battle_equip_table / token_table (zh_CN, as built into backups.json)
+// and PRTS 鸿雪 + “打字机” (点题 备注; the {{**|82%|下降18%}} marks = a final ×0.82; PRTS 伤害分类: "鸿雪2技能三段伤害的后2段"
+// are 持续伤害).
+// - Trait (重射手) "高精度的近距离射击": ranged physical arrows, 3-6, can hit air units (PRTS 分支特性信息 重射手 "可对空"),
+//   blocks 1, ground enemies target her (no flag).
+// - Module ARC-Y “打字机色带” trait "攻击正前方的敌人时攻击力提升至105%且无视其物理闪避" (trait bb atk_scale): her damage on
+//   an enemy whose body is on her straight line ahead ×atk_scale, not dodgeable — 点题's two 持续伤害 hits included
+//   [ASSUMED: they are two of its "3次攻击"]; 正前方 = local row 0, column ≥ 0 (her own tile included, as the 3-2 "前方3格"
+//   lines count it) [ASSUMED]. Stage 2+ "属性更强的打字机": the typewriter's stats of the data (token module attributes).
+// - Module ARC-X “仪式感”: "再部署时间减少" (attribute respawn_time −25, in the stats); stage 2+ upgrades 弱点速记 (below).
+// - T1 自动打字机 "可使用一个持续25秒的“打字机”，“打字机”拥有和自己一样的技能，拥有独立的再部署时间": the typewriter is a
+//   hand piece the player places (the mode's talent summons, content/tokens.js header): it deploys with the board, leaves
+//   after 25 s (the token's hidden talent `interval`), and comes back on its tile after its own redeploy time (data 40 s; ×
+//   respawn_time while she carries S2), paying its cost (5 DP), while she is on the field [ASSUMED: as the 海嗣]. Its skill
+//   is the copy of hers the data gives (bySkill: sktok_bgsnow_1 / 2 / 3 — the 卫戍 strategy force-opens a summon's manual
+//   skill, PRTS 卫戍协议/帮助): free (spCost 0), once per deployment, by the data's DEFAULT. It is untargetable ("不会受到
+//   攻击"), blocks nothing, hits air units. content/tokens.js has no kit for it: her install gives her pieces this one.
+// - T2 弱点速记 "“打字机”的攻击会使命中目标的防御力下降18%，持续4秒；若“打字机”放在鸿雪周围四格则效果提升至23%": every
+//   damage the typewriter's attacks land cuts the target's DEF by bgsnow_token[def_down]_1 (_2 while the typewriter stands
+//   on one of the 4 tiles next to her — while she is on the field [ASSUMED]) for `duration` s: the catalogue `defDown`
+//   (final ×, 同名 keeps the strongest). ARC-X stage 2+: 28 % / 33 % and "周围八格" (the talent text names the ring).
+// - S1 抑扬格 (AUTO, attack SP, data DEFAULT — an AUTO attack buff waits for her next attack): ATK +atk until she leaves the
+//   field ("持续时间无限": a toggle), and every attack meanwhile `prob` to deal ×atk_scale (one roll per attack).
+// - S2 点题 (MANUAL, 2 charges, data SKILL_RANGE on its 3-1): passive — the typewriter's redeploy time ×respawn_time;
+//   active — 3 attacks at once ("立即": the cast takes the next attack now) on one target of the 3-1, atk_scale × ATK each:
+//   the first a physical 普通伤害 attack, the other two physical 持续伤害 (PRTS 伤害分类: tags 'dot', not dodgeable).
+//   PRTS 备注 "仅在干员自身范围内有可攻击目标时可释放": the data's SKILL_RANGE fires for any enemy of the 3-1, untargetable
+//   ones too; the cast then waits (pending) for an attackable target — reported as an open question (the 备注 reading
+//   of the strategy would be the basic one on her own range).
+// - S3 锐笔速写 (MANUAL, data ACTIVE_RANGE on its 3-1): range 3-1 while it runs, attack interval base_attack_time s (−0.6 on
+//   1.6 s), every attack atk_scale × ATK, bgsnow_s_3[atk_up].atk_scale × ATK on the 正前方3格 (the 3-2 line, her tile
+//   included [ASSUMED]).
+
+import { num, up, traitBb, skillRec, batMod } from '../shared/tier1.js';
+import { absoluteRangeKeys } from '../../../targeting.js';
+import { bodyKeys, bodyInKeys } from '../../../body.js';
+import { toLocal } from '../../../dir.js';
+import { hasHp } from '../../../damage.js';
+import { COLS } from '../../../constants.js';
+
+const S1 = 'skchr_bgsnow_1';
+const S2 = 'skchr_bgsnow_2';
+const S3 = 'skchr_bgsnow_3';
+export const TYPEWRITER = 'token_10026_bgsnow_subbow';
+const TS1 = 'sktok_bgsnow_1';
+const TS2 = 'sktok_bgsnow_2';
+const TS3 = 'sktok_bgsnow_3';
+/** 锐笔速写's 正前方3格: the 3-2 line (range_table) — her tile and the three ahead. */
+const FRONT_3 = Object.freeze([[0, 0], [0, 1], [0, 2], [0, 3]]);
+/** 点题's two 持续伤害 hits (PRTS 伤害分类 attackType BUFF). */
+const TAG_PRECIS = 'bgsnow:precis';
+/** 自动打字机: the typewriter's life when neither the token nor the talent carries it (PRTS: 持续25秒 at E2). */
+const LIFE_FALLBACK = 25;
+
+const bbOf = (chess, id) => skillRec(chess, id)?.bb ?? {};
+/** First talent of a normalised token def holding `key` (token talents keep no index). */
+const tokTalent = (def, key) => (def?.talents ?? []).find((t) => t && t.bb && t.bb[key] != null) ?? null;
+
+/** ARC-Y 正前方: the enemy's body touches the unit's straight line ahead (local row 0, local column ≥ 0). */
+function inFrontLine(unit, e) {
+  for (const k of bodyKeys(e)) {
+    const [lr, lc] = toLocal(Math.floor(k / COLS) - unit.tileR, (k % COLS) - unit.tileC, unit.dir);
+    if (lr === 0 && lc >= 0) return true;
+  }
+  return false;
+}
+
+/** 点题 / its copy: the two 持续伤害 hits after the attack's first (普通伤害) hit, on the same target. */
+function precisFollowUps(battle, unit, target, scale) {
+  for (let i = 0; i < 2 && target && target.alive; i++) {
+    battle.dealDamage(unit, target, { amount: unit.s.atk * scale, type: 'phys', isSkill: true, canDodge: false, tags: ['skill', 'dot', TAG_PRECIS] });
+  }
+}
+
+/** 抑扬格 / its copy: while `on(unit)`, every attack `prob` to deal ×scale (one roll per attack). */
+function installIamb(battle, unit, prob, scale, on) {
+  if (!(prob > 0) || !(scale > 0) || scale === 1) return;
+  battle.on('hit', (ctx) => {
+    const d = ctx.dmg, t = ctx.target;
+    if (ctx.source !== unit || !t || t.side !== 'enemy' || !d.isAttack || d.isSplash || d.type === 'element' || !on(unit)) return;
+    const m = unit.mem;
+    if (!d.attackId || m.iambRollId !== d.attackId) {
+      m.iambRollId = d.attackId;
+      m.iambProc = battle.rng.chance(prob);
+      if (m.iambProc) battle.fx('crit', { x: t.x, y: t.y, id: unit.id });
+    }
+    if (m.iambProc) d.amount *= scale;
+  }, { owner: unit });
+}
+
+/**
+ * The typewriter's kit: its skill (the copy of her skill the data gives), 弱点速记, its life and its redeploys.
+ * `owner` = 鸿雪, `chess` = her composed record.
+ */
+function typewriterKit(t, owner, chess) {
+  const def = t.def;
+  const sk = def.skill ?? null;
+  const tb = sk?.bb ?? {};
+  const weak = tokTalent(def, 'duration');
+  const wb = weak?.bb ?? {};
+  const cut1 = -num(wb['bgsnow_token[def_down]_1.def']), cut2 = -num(wb['bgsnow_token[def_down]_2.def'], -cut1);
+  const ring8 = /八格/.test(String(weak?.description ?? ''));
+  const ownTalent = (chess?.talents ?? []).find((x) => x && x.index === 0)?.bb ?? {};
+  const life = num(tokTalent(def, 'interval')?.bb?.interval, num(ownTalent.duration, LIFE_FALLBACK));
+  const respawnMul = owner.skill?.id === S2 ? num(bbOf(chess, S2).respawn_time, 1) : 1;
+  const near = () => {
+    if (!up(owner)) return false;
+    const dr = Math.abs(t.tileR - owner.tileR), dc = Math.abs(t.tileC - owner.tileC);
+    return ring8 ? Math.max(dr, dc) === 1 : dr + dc === 1;
+  };
+  const skillOn = (u) => !!(u.skill && u.skill.active);
+  let skill = null;
+  if (sk?.id === TS1) skill = { kind: 'toggle', mods: { atkPct: num(tb.atk) } };
+  else if (sk?.id === TS2) {
+    const scale = num(tb.atk_scale, 1);
+    skill = { kind: 'instant', attack: { atkScale: scale, onHit({ battle, unit, target }) { precisFollowUps(battle, unit, target, scale); } } };
+  } else if (sk?.id === TS3) {
+    skill = {
+      kind: 'duration',
+      targeting: { rangeGrid: sk.rangeGrid ?? [[0, 0], [0, 1], [0, 2], [0, 3], [0, 4]] },
+      mods: { batPct: batMod(tb.base_attack_time, { stats: def.stats }) },
+      attack: { atkScale: num(tb['attack@atk_scale'], 1) },
+    };
+  }
+  return {
+    skill,
+    talents: [{ install(battle, unit) { // 弱点速记: every damage of its attacks cuts the target's DEF (near her: more)
+      const dur = num(wb.duration, 4);
+      if (!(cut1 > 0) || !(dur > 0)) return;
+      battle.on('damaged', (ctx) => {
+        if (ctx.source !== unit || !ctx.target || ctx.target.side !== 'enemy' || !hasHp(ctx.target) || ctx.dmg?.type === 'element') return;
+        battle.applyStatus(ctx.target, 'defDown', { duration: dur, value: near() ? cut2 : cut1, source: unit });
+      }, { owner: unit });
+    } }],
+    install(battle, unit) {
+      if (sk?.id === TS1) installIamb(battle, unit, num(tb.prob), num(tb.atk_scale, 1), skillOn);
+      // 持续25秒: leaves `life` s after each deployment
+      battle.on('deploy', (ctx) => {
+        if (ctx.unit !== unit || !(life > 0)) return;
+        const seq = unit.deploySeq;
+        battle.after(life, () => { if (unit.alive && unit.deploySeq === seq) battle.retreat(unit, { reason: 'expired', permanent: true }); }, { owner: unit });
+      }, { owner: unit });
+      // 拥有独立的再部署时间: back on its tile after its redeploy time, paying its cost, while 鸿雪 stands (the piece is kept:
+      // `removed` false, as content/tokens.js enableRespawn)
+      battle.on('death', (ctx) => {
+        if (ctx.unit !== unit || battle.finished) return;
+        unit.removed = false;
+        const at = battle.time + Math.max(0, num(unit.base.respawnTime) * respawnMul);
+        unit.mem.respawnAt = at;
+        battle.every(0.25, (b, sched) => {
+          if (unit.alive || unit.removed) { sched.cancel(); return; }
+          if (b.time + 1e-9 < at || !up(owner)) return;
+          if (b.redeploy(unit, { free: false })) sched.cancel();
+        }, { owner: unit });
+      }, { owner: unit, priority: -10 });
+    },
+  };
+}
+
+export default {
+  char_4055_bgsnow: (bb, chess) => {
+    const b1 = bbOf(chess, S1), b2 = bbOf(chess, S2), b3 = bbOf(chess, S3);
+    const s2 = skillRec(chess, S2), s3 = skillRec(chess, S3);
+    const frontScale = num(traitBb(chess).atk_scale, 1);
+    const s2Scale = num(b2.atk_scale, 1);
+    const s3Scale = num(b3.atk_scale, 1), s3Front = num(b3['bgsnow_s_3[atk_up].atk_scale'], s3Scale);
+    return {
+      skills: {
+        [S1]: { kind: 'toggle', mods: { atkPct: num(b1.atk) } },
+        [S2]: {
+          kind: num(s2?.maxChargeTime, 1) > 1 ? 'charges' : 'instant',
+          // the 3-1 selects the target; her attack range stays her own (a 技能范围, not a range change)
+          targeting: { rangeGrid: s2?.rangeGrid ?? null, showOwnRange: true },
+          attack: { atkScale: s2Scale, onHit({ battle, unit, target }) { precisFollowUps(battle, unit, target, s2Scale); } },
+          onStart({ unit }) { unit.atkCd = 0; }, // "立即": the pending attack goes off now when a target is there
+        },
+        [S3]: {
+          kind: 'duration',
+          targeting: { rangeGrid: s3?.rangeGrid ?? null },
+          mods: { batPct: batMod(b3.base_attack_time, chess) },
+          attack: { atkScale: s3Scale },
+        },
+      },
+      talents: [
+        // 自动打字机 (and 弱点速记, the typewriter's own talent): her typewriter pieces run the typewriter's kit — set up
+        // here, before the battle starts (Battle._setupUnit with a kit, as spawnToken's `kit` option)
+        { install(battle, unit) {
+          for (const t of battle.allyUnits) {
+            if (t.kind !== 'token' || t.defId !== TYPEWRITER || t.ownerUnit !== unit || t.alive || t.deployed) continue;
+            if (t.kit) battle.offOwner(t); // a piece set up before her: drop its generic kit's hooks
+            battle._setupUnit(t, typewriterKit(t, unit, chess));
+          }
+        } },
+      ],
+      install(battle, unit) {
+        const sid = unit.skill?.id;
+        if (sid === S1) installIamb(battle, unit, num(b1.prob), num(b1.atk_scale, 1), (u) => !!u.skill?.active);
+        // 锐笔速写: 正前方3格 ⇒ atk_up's scale instead of the skill's
+        if (sid === S3 && s3Front !== s3Scale && s3Scale > 0) {
+          battle.on('hit', (ctx) => {
+            const d = ctx.dmg, t = ctx.target;
+            if (ctx.source !== unit || !t || t.side !== 'enemy' || !d.isAttack || !unit.skill?.active) return;
+            if (bodyInKeys(t, absoluteRangeKeys(FRONT_3, unit.tileR, unit.tileC, unit.dir, 0))) d.amount *= s3Front / s3Scale;
+          }, { owner: unit });
+        }
+        // ARC-Y 打字机色带: 攻击正前方的敌人时攻击力提升至105%且无视其物理闪避
+        if (frontScale > 0 && frontScale !== 1) {
+          battle.on('hit', (ctx) => {
+            const d = ctx.dmg, t = ctx.target;
+            if (ctx.source !== unit || !t || t.side !== 'enemy' || d.type === 'element') return;
+            if (!(d.isAttack || d.tags?.includes(TAG_PRECIS)) || !inFrontLine(unit, t)) return;
+            d.amount *= frontScale;
+            d.canDodge = false;
+          }, { owner: unit });
+        }
+      },
+    };
+  },
+};

server/sim/content/kits/ops/op-shwaz.js

@@ -0,0 +1,162 @@
+// server/sim/content/kits/ops/op-shwaz.js — 黑 (char_340_shwaz) 自选 operator kit: 6★ 重射手 (狙击), an owned-6★ pick of the
+// tier-5 and tier-6 自选 slots; every skill, both talents, the trait and both modules (ARC-X 定制弩配件套装, ARC-Y 老剃刀) at
+// every form. Kit contract and the 自选 rules: ../README.md ("How to add an operator (自选)").
+//
+// Forms (data/backups.json units.char_340_shwaz): normal = E2 Lv1, skills at rank 4, no module; elite = E2 Lv60, rank 7,
+// the picked module at stage 1 (tier 5) or 3 (tier 6) — the owner's decision of 2026-10-05. Potential 0 [ASSUMED: no
+// account]. Sources: character_table / skill_table / battle_equip_table (zh_CN, as built into backups.json) and PRTS 黑
+// (破甲箭头 备注 "攻击力提升效果为提升攻击力倍率"; 战术的终结 "攻击间隔略微增大(+0.4)"; the {{**|80%|下降20%}} marks of the
+// DEF cut = a final ×0.8).
+// - Trait (重射手) "高精度的近距离射击": the plain closerange profile — ranged physical arrows, 3-6, can hit air units
+//   (PRTS 分支特性信息 重射手 "可对空"), blocks 1, ground enemies target her (no flag).
+// - T1 破甲箭头 "攻击时，20%几率当次攻击的攻击力提升至160%，并使命中目标的防御力下降20%，持续5秒": one roll per attack
+//   (`prob`); on a proc the attack's damage ×atk_scale (an ATK-scale multiplier, PRTS 备注, so it multiplies the skills'
+//   own scales) and, once the hit landed (命中: a dodged hit does nothing), the target's DEF ×(1 + def) for
+//   defdown_duration s — the catalogue `defDown` (final ×0.8, PRTS; 同名 keeps the strongest). The skills raise the chance:
+//   S1's next attack to S1 talent@prob, S2 / S3's attacks while they run to their talent@prob (every attack a skill makes
+//   carries dmg.isSkill — S2's empty attack override marks its attacks for that). ARC-Y stage 2+ upgrades it (stage 3:
+//   170 %, DEF −25 %) — read from the base talent and the module's NAMED change: ARC-Y's hidden talent part (talentIndex 0,
+//   isHideTalent, atk_scale 1.05, prefabKey "10") is the trait's 105 % as a talent of its own in the game, which the
+//   data's merge by talentIndex folds into 破甲箭头 at stage 1 (composed atk_scale 1.05) — reported, not used.
+// - T2 交叉火力 "场上存在黑和另外至少一名【狙击】干员时，所有【狙击】干员的攻击力+8%": while she is on the field and another
+//   【狙击】 operator is too, every 【狙击】 operator of the field (her included; a partner's in a shared field too [ASSUMED,
+//   as 推进之王's 万兽之王]) ATK +atk, refreshed every 0.5 s (lapses within 0.6 s when the condition ends); several sources
+//   keep the strongest. ARC-X stage 2+ "携带黑和另外至少一名【狙击】干员时…+13%": 携带 = in the squad — the player's own
+//   pieces of the battle, deployed or not — so with another 【狙击】 piece in her player's battle every 【狙击】 operator of
+//   that player ATK +13 % for the whole battle (persist; a partner's operators are not in her squad [ASSUMED]).
+// - Module ARC-X “定制弩配件套装”: "再部署时间减少" (attribute respawn_time −25, in the stats: 70 → 45 s) + HP / ATK.
+// - Module ARC-Y “老剃刀” trait "攻击正前方的敌人时攻击力提升至105%且无视其物理闪避" (trait bb atk_scale): her attack damage
+//   on an enemy whose body is on her straight line ahead ×atk_scale and not dodgeable (canDodge false — her damage is
+//   physical only). 正前方 = local row 0, column ≥ 0 in her facing — her own tile included, as S3's 3-2 "前方3格" counts
+//   it [ASSUMED: no source draws the line].
+// - S1 强弩 (AUTO, attack SP 4, data DEFAULT): the next attack ×atk_scale (and the T1 chance above).
+// - S2 暮眼锐瞳 (MANUAL, data DEFAULT): ATK +atk for 33 / 36 s, T1 chance talent@prob.
+// - S3 战术的终结 (MANUAL): range → 3-2 (her tile + 3 ahead) while it runs, attack interval +base_attack_time s (a flat
+//   +0.4 on her 1.6 s, PRTS), ATK +atk, T1 chance 100 %. Trigger: the data's DEFAULT (the basic strategy) — "攻击范围改为前方
+//   3格" is an attack-range change, not a 技能范围 (tools/build-data.mjs ATTACK_RANGE_CHANGE has "改为" since O6's report).
+
+import { num, up, traitBb, moduleOn, skillRec, batMod } from '../shared/tier1.js';
+import { bodyKeys } from '../../../body.js';
+import { toLocal } from '../../../dir.js';
+import { hasHp } from '../../../damage.js';
+import { COLS } from '../../../constants.js';
+
+const S1 = 'skchr_shwaz_1';
+const S2 = 'skchr_shwaz_2';
+const S3 = 'skchr_shwaz_3';
+/** 交叉火力's buff (the field aura and the squad version share it: one effect per operator, the strongest). */
+const CROSSFIRE = 'talent:shwaz:crossfire';
+/** 交叉火力's refresh interval (s), as installAura. */
+const AURA_EVERY = 0.5;
+
+const bbOf = (chess, id) => skillRec(chess, id)?.bb ?? {};
+/** A 【狙击】 operator (summons are never operators). */
+const isSniperOp = (a) => !!a && a.kind === 'op' && a.def?.profession === 'SNIPER';
+
+/** The module the record fights with (its active one), or null. */
+function activeModule(chess) {
+  if (!moduleOn(chess)) return null;
+  return (chess.modules ?? []).find((m) => m && m.uniEquipId === chess.module.id) ?? null;
+}
+
+/**
+ * 破甲箭头's blackboard: the base talent (no module) with the module's NAMED changes of talent 0 only — never the hidden
+ * trait part (see the header).
+ */
+function pierceBb(chess) {
+  const base = (chess?.talentsBase ?? chess?.talents ?? []).find((t) => t && t.index === 0)?.bb ?? {};
+  const ups = (activeModule(chess)?.talentChanges ?? []).filter((t) => t && t.talentIndex === 0 && !t.hidden && t.name);
+  return Object.assign({}, base, ...ups.map((t) => t.bb || {}));
+}
+
+/** The record's 交叉火力 (talent 1, the module's change included): its blackboard and whether it reads 携带 (squad). */
+function crossfireOf(chess) {
+  const t = (chess?.talents ?? []).find((x) => x && x.index === 1) ?? null;
+  return { atk: num(t?.bb?.atk), squad: /携带/.test(String(t?.desc ?? '')) };
+}
+
+/** ARC-Y 正前方: the enemy's body touches the unit's straight line ahead (local row 0, local column ≥ 0). */
+function inFrontLine(unit, e) {
+  for (const k of bodyKeys(e)) {
+    const [lr, lc] = toLocal(Math.floor(k / COLS) - unit.tileR, (k % COLS) - unit.tileC, unit.dir);
+    if (lr === 0 && lc >= 0) return true;
+  }
+  return false;
+}
+
+export default {
+  char_340_shwaz: (bb, chess) => {
+    const b1 = bbOf(chess, S1), b2 = bbOf(chess, S2), b3 = bbOf(chess, S3);
+    const s3 = skillRec(chess, S3);
+    const t0 = pierceBb(chess);
+    const cross = crossfireOf(chess);
+    const frontScale = num(traitBb(chess).atk_scale, 1);
+    return {
+      skills: {
+        [S1]: { kind: 'instant', attack: { atkScale: num(b1.atk_scale, 1) } },
+        // (an empty attack override: the attacks made while it runs carry dmg.isSkill — 破甲箭头's raised chance)
+        [S2]: { kind: 'duration', mods: { atkPct: num(b2.atk) }, attack: {} },
+        [S3]: {
+          kind: 'duration',
+          targeting: { rangeGrid: s3?.rangeGrid ?? [[0, 0], [0, 1], [0, 2], [0, 3]] },
+          mods: { atkPct: num(b3.atk), batPct: batMod(b3.base_attack_time, chess) },
+        },
+      },
+      talents: [
+        { install(battle, unit) { // 破甲箭头: one roll per attack; ×atk_scale on a proc, then DEF cut on the target hit
+          const scale = num(t0.atk_scale, 1), cut = -num(t0.def), dur = num(t0.defdown_duration, 5), base = num(t0.prob);
+          const sid = unit.skill?.id;
+          const raised = num(bbOf(chess, sid)['talent@prob'], base);
+          battle.on('hit', (ctx) => {
+            const d = ctx.dmg, t = ctx.target;
+            if (ctx.source !== unit || !t || t.side !== 'enemy' || !d.isAttack || d.isSplash || d.type === 'element') return;
+            const m = unit.mem;
+            if (!d.attackId || m.shwazRollId !== d.attackId) {
+              m.shwazRollId = d.attackId;
+              const p = d.isSkill ? raised : base;
+              m.shwazProc = p > 0 && battle.rng.chance(p);
+              if (m.shwazProc) battle.fx('crit', { x: t.x, y: t.y, id: unit.id });
+            }
+            if (!m.shwazProc) return;
+            d.amount *= scale;
+            d.shwazPierce = true;
+          }, { owner: unit });
+          battle.on('damaged', (ctx) => {
+            if (ctx.source !== unit || !ctx.dmg?.shwazPierce || !(cut > 0) || !hasHp(ctx.target) || ctx.target.side !== 'enemy') return;
+            battle.applyStatus(ctx.target, 'defDown', { duration: dur, value: cut, source: unit });
+          }, { owner: unit });
+        } },
+        { install(battle, unit) { // 交叉火力: field aura, or (ARC-X stage 2+) the squad's snipers for the whole battle
+          const v = cross.atk;
+          if (!(v > 0)) return;
+          const give = (a, extra) => {
+            const cur = a.findBuff(CROSSFIRE);
+            if (cur && cur.source !== unit && (cur.data?.v ?? 0) > v && cur.timeLeft > 0.05) return;
+            battle.addBuff(a, { key: CROSSFIRE, mods: { atkPct: v }, source: unit, data: { v }, ...extra });
+          };
+          if (cross.squad) {
+            const squad = battle.allyUnits.filter((a) => isSniperOp(a) && a.ownerId === unit.ownerId);
+            if (squad.some((a) => a !== unit)) for (const a of squad) give(a, { persist: true, allowDead: true, tags: ['talent'] });
+            return;
+          }
+          battle.every(AURA_EVERY, () => {
+            if (!up(unit)) return;
+            const snipers = battle.alliesFor(unit).filter(isSniperOp);
+            if (!snipers.some((a) => a !== unit)) return;
+            for (const a of snipers) give(a, { duration: AURA_EVERY + 0.1, tags: ['aura'] });
+          }, { owner: unit, immediate: true });
+        } },
+      ],
+      install(battle, unit) {
+        // ARC-Y 老剃刀: 攻击正前方的敌人时攻击力提升至105%且无视其物理闪避
+        if (!(frontScale > 0) || frontScale === 1) return;
+        battle.on('hit', (ctx) => {
+          const d = ctx.dmg, t = ctx.target;
+          if (ctx.source !== unit || !t || t.side !== 'enemy' || !d.isAttack || d.type === 'element' || !inFrontLine(unit, t)) return;
+          d.amount *= frontScale;
+          d.canDodge = false;
+        }, { owner: unit });
+      },
+    };
+  },
+};

test/content/op_bgsnow.test.js

@@ -0,0 +1,306 @@
+// test/content/op_bgsnow.test.js — the 自选 operator kit of 鸿雪 (char_4055_bgsnow, 6★ 重射手; kit
+// server/sim/content/kits/ops/op-bgsnow.js) and of her summon “打字机” (token_10026_bgsnow_subbow), fielded the production
+// way (a DIY slot + its `diy` pick, simdata getDiy; the typewriter as the placed hand piece of her player) in every form:
+// tiers 5 / 6, normal (E2 Lv1, skill rank 4, no module) and elite (E2 Lv60, rank 7) with no module, ARC-Y “打字机色带” or
+// ARC-X “仪式感” at stage 1 (tier 5) / 3 (tier 6). Numbers from data/backups.json; the fidelity checklist of kits/README.md.
+// Run: node --test test/content/op_bgsnow.test.js
+
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import { makeBattle, enemyRec, checkInvariants } from '../helpers/battleHarness.js';
+import { KITTED_CHARS, OPERATOR_KITS, KITS } from '../../server/sim/content/kits/index.js';
+import { diyPool, validateDiyPicks } from '../../shared/diy.js';
+
+const load = (f) => JSON.parse(readFileSync(new URL(`../../data/${f}.json`, import.meta.url), 'utf8'));
+const CHESS = load('chess');
+const BACKUPS = load('backups');
+const SNOW = 'char_4055_bgsnow';
+const TOK = 'token_10026_bgsnow_subbow';
+const FORMS = BACKUPS.units[SNOW].forms;
+const TOKREC = BACKUPS.tokens[TOK];
+const SLOT = { 5: 'chess_char_5_diy1_a', 6: 'chess_char_6_diy1_a' };
+const Y = 'uniequip_002_bgsnow', X = 'uniequip_003_bgsnow';
+const S1 = 'skchr_bgsnow_1', S2 = 'skchr_bgsnow_2', S3 = 'skchr_bgsnow_3';
+const statusOf = (tier, elite) => (elite ? (tier === 5 ? '2/60/7/1' : '2/60/7/3') : '2/1/4/0');
+const formOf = (tier, elite) => FORMS[statusOf(tier, elite)];
+const skillOf = (tier, elite, id) => formOf(tier, elite).skills.find((s) => s.skillId === id);
+const modOf = (tier, mod) => (mod ? formOf(tier, true).modules.find((m) => m.uniEquipId === mod) : null);
+/** The typewriter's variant of a form, with the pick's skill / module (getDiyToken). */
+const tokOf = (tier, elite, skill, mod) => {
+  let v = TOKREC.variants[`${SNOW}@${statusOf(tier, elite)}`];
+  if (v.bySkill?.[skill]) v = { ...v, ...v.bySkill[skill] };
+  if (mod && v.byModule?.[mod]) v = { ...v, ...v.byModule[mod] };
+  return v;
+};
+const approx = (a, b, msg, eps = 1e-6) => assert.ok(Math.abs(a - b) <= eps * Math.max(1, Math.abs(b)), `${msg}: ${a} vs ${b}`);
+const dummy = (key, o = {}) => enemyRec({ key, hp: 1e9, speed: 0, mass: 0, ...o });
+const ENEMIES = { enemy_dummy: dummy('enemy_dummy'), enemy_fly: dummy('enemy_fly', { motion: 'FLY' }) };
+const FORMS_ALL = [[5, false, null], [6, false, null], ...[5, 6].flatMap((t) => [null, Y, X].map((m) => [t, true, m]))];
+
+/** 鸿雪 as uid 1 at (10, 5) facing RIGHT; `tok` = the typewriter piece's tile (uid 2) or null. */
+function field({ tier = 5, elite = false, mod = null, skill = 0, tok = null, tokFirst = false, seed = 5, others = [] } = {}) {
+  const op = { uid: 1, diy: { slot: SLOT[tier], charId: SNOW, skillIndex: skill, uniEquipId: mod }, elite, row: 10, col: 5 };
+  const piece = tok ? [{ uid: 2, kind: 'token', tokenId: TOK, ownerUid: 1, row: tok[0], col: tok[1] }] : [];
+  const h = makeBattle({
+    defs: { enemies: ENEMIES }, timeLimit: 900, autoFinish: false, seed,
+    flags: { dpPerSec: 0, dpMax: 999 }, hooks: ['damaged', 'skillStart', 'skillEnd', 'statusApplied', 'death', 'deploy', 'attack', 'dodge'], captureNoisy: true,
+    units: tokFirst ? [...piece, op, ...others] : [op, ...piece, ...others],
+  });
+  h.step();
+  return { h, u: h.unit(1), t: h.b.allyUnits.find((a) => a.kind === 'token' && a.defId === TOK) ?? null };
+}
+const from = (h, src) => h.hooksOf('damaged').filter((c) => c.source === src);
+function done(h) {
+  checkInvariants(h.b);
+  assert.equal(h.b.errors.length, 0, JSON.stringify(h.b.errors[0]));
+}
+const label = ([tier, elite, mod]) => `T${tier} ${elite ? 'elite' : 'normal'} ${mod ?? 'none'}`;
+
+test('鸿雪 in every 自选 form: her kit, the form\'s stats + module attributes, 3-6, ranged physical, hits air, blocks 1, ground-targetable, the data triggers; offered as a pick', () => {
+  assert.equal(OPERATOR_KITS[SNOW], KITS[SNOW]);
+  for (const f of FORMS_ALL) {
+    const [tier, elite, mod] = f;
+    for (const skill of [0, 1, 2]) {
+      const { h, u } = field({ tier, elite, mod, skill });
+      const form = formOf(tier, elite), m = elite ? modOf(tier, mod) : null;
+      assert.deepEqual([u.def.charId, u.def.diyFor, u.skill.id, !!u.kit.generic, u.kit.skillSource], [SNOW, SLOT[tier], form.skills[skill].skillId, false, 'skills'], label(f));
+      assert.deepEqual([u.base.maxHp, u.base.atk, u.base.def, u.base.respawnTime],
+        [form.stats.maxHp + (m?.attr.maxHp ?? 0), form.stats.atk + (m?.attr.atk ?? 0), form.stats.def + (m?.attr.def ?? 0), form.stats.respawnTime + (m?.attr.respawnTime ?? 0)], `${label(f)}: stats`);
+      assert.deepEqual([u.s.blockCnt, u.profile.attack, u.profile.canHitFly, u.profile.dmgType, u.base.bat], [1, 'ranged', true, 'phys', 1.6], `${label(f)}: 重射手`);
+      assert.deepEqual(u.liveRangeGrid, form.rangeGrid, `${label(f)}: 3-6`);
+      assert.equal(u.skill.rule, form.skills[skill].trigger.rule, `${label(f)}: the data's trigger`);
+      assert.ok(!u.s.flags.liftoff && !u.s.flags.camou && !u.s.flags.stealth, `${label(f)}: ground enemies target her`);
+      done(h);
+    }
+  }
+  assert.deepEqual(formOf(6, true).skills.map((s) => s.trigger.rule), ['DEFAULT', 'SKILL_RANGE', 'ACTIVE_RANGE']);
+  assert.deepEqual([modOf(5, Y).attr, modOf(6, Y).attr, modOf(5, X).attr, modOf(6, X).attr],
+    [{ maxHp: 130, atk: 55 }, { maxHp: 170, atk: 75 }, { atk: 80, def: 10, respawnTime: -25 }, { atk: 120, def: 16, respawnTime: -25 }]);
+  const data = { chess: CHESS, backups: BACKUPS };
+  assert.ok(KITTED_CHARS.includes(SNOW) && [5, 6].every((t) => diyPool(t, { data, kitted: KITTED_CHARS }).includes(SNOW)));
+  assert.equal(validateDiyPicks({ [SLOT[5]]: { charId: SNOW, skillIndex: 1, uniEquipId: X } }, { data, kitted: KITTED_CHARS }).ok, true);
+});
+
+test('S1 抑扬格 (AUTO, attack SP 29 / 25, data DEFAULT): after that many attacks ATK +35 % / +50 % until she leaves the field, every attack meanwhile 30 % to deal ×145 % / ×160 %', () => {
+  for (const [tier, elite] of [[5, false], [6, true]]) {
+    const sk = skillOf(tier, elite, S1);
+    assert.deepEqual([sk.spCost, sk.bb.atk, sk.bb.prob, sk.bb.atk_scale], elite ? [25, 0.5, 0.3, 1.6] : [29, 0.35, 0.3, 1.45], `T${tier}`);
+    const { h, u } = field({ tier, elite, skill: 0, seed: 12 });
+    assert.deepEqual([u.skill.kind, u.skill.rule, u.skill.spType], ['toggle', 'DEFAULT', 'attack'], `T${tier}`);
+    h.spawn('enemy_dummy', { pos: [11, 6] });
+    assert.ok(h.runUntil(() => u.skill.active, 60), `T${tier}: cast`);
+    const before = from(h, u);
+    assert.equal(before.length, sk.spCost, `T${tier}: after ${sk.spCost} attacks`);
+    assert.ok(before.every((c) => Math.abs(c.amount - u.base.atk) < 1e-6), `T${tier}: plain before it`);
+    approx(u.s.atk, u.base.atk * (1 + sk.bb.atk), `T${tier}: ATK`);
+    h.run(500);
+    assert.ok(u.skill.active, `T${tier}: 持续时间无限`);
+    const after = from(h, u).slice(before.length);
+    const atk = u.base.atk * (1 + sk.bb.atk);
+    for (const c of after) assert.ok([atk, atk * sk.bb.atk_scale].some((v) => Math.abs(c.amount - v) < 1e-6), `T${tier}: ${c.amount}`);
+    const r = after.filter((c) => c.amount > atk + 1e-6).length / after.length;
+    assert.ok(Math.abs(r - sk.bb.prob) < 0.06, `T${tier}: ${r}`);
+    h.b.retreat(u);
+    assert.ok(!u.skill.active, `T${tier}: ends when she leaves`);
+    done(h);
+  }
+});
+
+test('S2 点题 (MANUAL, 2 charges, data SKILL_RANGE on 3-1): an enemy 3 tiles ahead (3-1, not 3-6) casts it and is struck at once: atk_scale × ATK as a 普通伤害 attack, then twice as 持续伤害 (not dodgeable); her card range stays 3-6', () => {
+  for (const [tier, elite] of [[5, false], [6, true]]) {
+    const sk = skillOf(tier, elite, S2);
+    assert.deepEqual([sk.bb.atk_scale, sk.bb.respawn_time, sk.maxChargeTime, sk.spCost, sk.initSp], elite ? [2, 0.6, 2, 10, 6] : [1.8, 0.65, 2, 11, 3], `T${tier}`);
+    const { h, u } = field({ tier, elite, skill: 1, seed: 3 });
+    assert.deepEqual([u.skill.kind, u.skill.rule, u.skill.maxCharges], ['charges', 'SKILL_RANGE', 2], `T${tier}`);
+    u.skill.gainSp(999);
+    h.run(1);
+    assert.equal(u.skill.activations, 0, `T${tier}: nobody in range`);
+    const e = h.spawn('enemy_dummy', { pos: [10, 8] });
+    h.b.addBuff(e, { key: 'test:dodge', mods: { dodgePhys: 1 } });
+    assert.ok(h.runUntil(() => u.skill.activations === 1, 1), `T${tier}: cast for the enemy on 3-1`);
+    const tc = h.b.time;
+    assert.deepEqual(u.liveRangeGrid, formOf(tier, elite).rangeGrid, `T${tier}: the card keeps 3-6`);
+    h.run(0.5);
+    const atk = h.hooksOf('attack').filter((c) => c.attacker === u);
+    approx(atk[0].t, tc, `T${tier}: 立即`, 0.04);
+    assert.equal(atk[0].isSkill, true);
+    const dodged = h.hooksOf('dodge').filter((c) => c.source === u);
+    const hits = from(h, u);
+    assert.equal(dodged.length, 1, `T${tier}: the 普通伤害 hit can be dodged (a dodge enemy)`);
+    assert.equal(hits.length, 2, `T${tier}: the two 持续伤害 hits cannot`);
+    for (const c of hits) {
+      approx(c.amount, u.s.atk * sk.bb.atk_scale, `T${tier}: ×${sk.bb.atk_scale}`);
+      assert.deepEqual([c.dmg.isAttack, c.dmg.canDodge, c.dmg.tags.includes('dot'), c.type], [false, false, true, 'phys']);
+    }
+    assert.equal(u.skill.charges, 1, `T${tier}: one of two charges spent`);
+    h.b.removeBuff(e, 'test:dodge');
+    const n0 = from(h, u).length;
+    h.run(3.5);
+    const second = from(h, u).slice(n0).filter((c) => c.dmg.isSkill);
+    assert.deepEqual(second.map((c) => [c.dmg.isAttack, c.dmg.tags.includes('dot')]), [[true, false], [false, true], [false, true]], `T${tier}: the second charge 3 s later: 普通 then 2 × 持续`);
+    done(h);
+  }
+});
+
+test('S3 锐笔速写 (MANUAL, data ACTIVE_RANGE on 3-1): an enemy only on [0,3] casts it; range 3-1 (and back), interval 1.6 − 0.6 s, ×155 % / 170 % off her line, ×185 % / 215 % on the 正前方3格', () => {
+  for (const [tier, elite] of [[5, false], [6, true]]) {
+    const sk = skillOf(tier, elite, S3);
+    assert.deepEqual([sk.duration, sk.bb.base_attack_time, sk.bb.atk_scale, sk.bb['bgsnow_s_3[atk_up].atk_scale'], sk.rangeId], elite ? [27, -0.6, 1.7, 2.15, '3-1'] : [26, -0.6, 1.55, 1.85, '3-1'], `T${tier}`);
+    const { h, u } = field({ tier, elite, skill: 2, seed: 7 });
+    assert.deepEqual([u.skill.kind, u.skill.rule], ['duration', 'ACTIVE_RANGE']);
+    u.skill.gainSp(999);
+    const far = h.spawn('enemy_dummy', { pos: [10, 8] });
+    assert.ok(h.runUntil(() => u.skill.active, 1), `T${tier}: cast for [0,3] (outside 3-6)`);
+    assert.deepEqual(u.liveRangeGrid, sk.rangeGrid, `T${tier}: 3-1 while it runs`);
+    approx(u.s.interval, 1.0, `T${tier}: interval`);
+    const side = h.spawn('enemy_dummy', { pos: [11, 7] });
+    h.b.kill(far, null);
+    const front = h.spawn('enemy_dummy', { pos: [10, 7] });
+    h.run(8);
+    const onFront = from(h, u).filter((c) => c.dmg.isAttack && c.target === front);
+    h.b.kill(front, null);
+    h.run(4);
+    const onSide2 = from(h, u).filter((c) => c.dmg.isAttack && c.target === side);
+    assert.ok(onFront.length > 3 && onSide2.length > 1, `T${tier}: both struck (${onFront.length} / ${onSide2.length})`);
+    for (const c of onFront) approx(c.amount, u.base.atk * sk.bb['bgsnow_s_3[atk_up].atk_scale'], `T${tier}: 正前方3格`);
+    for (const c of onSide2) approx(c.amount, u.base.atk * sk.bb.atk_scale, `T${tier}: off the line`);
+    u.skill.extend(-999);
+    h.step(2);
+    assert.deepEqual(u.liveRangeGrid, formOf(tier, elite).rangeGrid, `T${tier}: back to 3-6`);
+    approx(u.s.interval, 1.6, `T${tier}: interval back`);
+    done(h);
+  }
+});
+
+test('ARC-Y 打字机色带 trait: ×105 % and no dodge on her straight line ahead (stages 1 and 3) — 点题\'s 持续伤害 hits too; off the line it dodges; ARC-X / no module nothing', () => {
+  for (const f of FORMS_ALL) {
+    const [tier, elite, mod] = f;
+    const y = elite && mod === Y;
+    const { h, u } = field({ tier, elite, mod, skill: 1, seed: 3 });
+    u.skill.charges = 0; u.skill.sp = 0;
+    h.b.addBuff(u, { key: 'test:noSp', flags: { noSp: true } });
+    const front = h.spawn('enemy_dummy', { pos: [10, 7] });
+    const side = h.spawn('enemy_dummy', { pos: [11, 7] });
+    for (const e of [front, side]) h.b.addBuff(e, { key: 'test:dodge', mods: { dodgePhys: 1 } });
+    h.run(12);
+    const onFront = from(h, u).filter((c) => c.target === front);
+    if (y) {
+      assert.ok(onFront.length > 4, `${label(f)}: the front enemy is hit`);
+      for (const c of onFront) approx(c.amount, u.s.atk * 1.05, `${label(f)}: ×1.05`);
+      // 点题 on the front enemy: all three hits ×1.05
+      h.b.removeBuff(u, 'test:noSp');
+      u.skill.addCharge(1);
+      const n0 = from(h, u).length;
+      h.run(0.5);
+      const s2 = from(h, u).slice(n0).filter((c) => c.dmg.isSkill);
+      assert.equal(s2.length, 3, `${label(f)}: 点题's three hits land`);
+      for (const c of s2) approx(c.amount, u.s.atk * skillOf(tier, true, S2).bb.atk_scale * 1.05, `${label(f)}: 点题 ×1.05`);
+      h.b.kill(front, null);
+      h.run(6);
+      assert.ok(h.hooksOf('dodge').filter((c) => c.source === u && c.target === side).length > 2, `${label(f)}: off the line it dodges`);
+    } else {
+      assert.equal(onFront.length, 0, `${label(f)}: every attack dodged`);
+    }
+    done(h);
+  }
+});
+
+test('“打字机”: her placed piece runs its kit (not the generic one) — the variant\'s stats (ARC-Y stage 3 stronger), untargetable, 3-2, blocks 0, hits air; deploys with the board, leaves after 25 s, back on its tile after 40 s (S2: ×65 % / ×60 %) for 5 DP, never while 鸿雪 is down', () => {
+  for (const f of FORMS_ALL) {
+    const [tier, elite, mod] = f;
+    for (const skill of [0, 1, 2]) {
+      const v = tokOf(tier, elite, skill, elite ? mod : null);
+      const { h, t } = field({ tier, elite, mod, skill, tok: [12, 3], tokFirst: skill === 1 });
+      assert.ok(t && t.alive && t.deployed, `${label(f)} S${skill + 1}: deployed with the board`);
+      assert.deepEqual([!!t.kit.generic, t.skill.id, t.base.atk, t.base.maxHp, t.base.respawnTime, t.base.cost], [false, v.skill.skillId, v.stats.atk, v.stats.maxHp, 40, 5], `${label(f)} S${skill + 1}`);
+      assert.deepEqual([!!t.s.flags.untargetable, t.s.blockCnt, t.profile.canHitFly, t.profile.attack, t.liveRangeGrid], [true, 0, true, 'ranged', [[0, 0], [0, 1], [0, 2], [0, 3]]], `${label(f)} S${skill + 1}: 不会受到攻击`);
+      done(h);
+    }
+  }
+  assert.deepEqual([tokOf(5, false, 0).stats.atk, tokOf(5, true, 0).stats.atk, tokOf(6, true, 0, Y).stats.atk, tokOf(5, true, 0, Y).stats.atk], [666, 799, 869, 799]);
+  // life and redeploys (S1: 40 s; S2: ×respawn_time)
+  for (const [tier, elite, skill, mul] of [[5, false, 0, 1], [5, false, 1, 0.65], [6, true, 1, 0.6]]) {
+    const { h, u, t } = field({ tier, elite, skill, tok: [12, 3] });
+    h.b.players[0].dp = 20;
+    assert.ok(h.runUntil(() => !t.alive, 26));
+    approx(h.b.time, 25, `T${tier} S${skill + 1}: 25 s`, 0.05);
+    assert.equal(h.hooksOf('death').find((c) => c.unit === t).reason, 'expired');
+    assert.ok(h.runUntil(() => t.alive, 60));
+    approx(h.b.time, 25 + 40 * mul, `T${tier} S${skill + 1}: back after ${40 * mul} s`, 0.3);
+    assert.deepEqual([t.tileR, t.tileC, h.b.players[0].dp], [12, 3, 15], `T${tier} S${skill + 1}: on its tile, 5 DP`);
+    assert.ok(u.alive);
+    done(h);
+  }
+  // 鸿雪 down: the typewriter waits for her
+  const { h, u, t } = field({ tier: 5, elite: false, skill: 0, tok: [12, 3] });
+  h.b.players[0].dp = 0;
+  h.run(10);
+  h.b.kill(u, null);
+  h.run(60);
+  assert.ok(!t.alive, 'not while 鸿雪 is down');
+  h.b.players[0].dp = 25;
+  assert.ok(h.runUntil(() => u.alive, 30), '鸿雪 back');
+  assert.ok(h.runUntil(() => t.alive, 1), 'then the typewriter');
+  done(h);
+});
+
+test('“打字机”\'s skill is the copy of hers, free once per deployment: S1 ATK +35 % / +50 % for good with the 30 % proc, S2 three hits of ×180 % / ×200 % (普通 + 2 × 持续), S3 4-1 + interval −0.6 s + ×185 % / ×215 % for 16 / 17 s', () => {
+  for (const [tier, elite] of [[5, false], [6, true]]) {
+    for (const skill of [0, 1, 2]) {
+      const v = tokOf(tier, elite, skill, null);
+      const tb = v.skill.bb;
+      const { h, t } = field({ tier, elite, skill, tok: [11, 5], seed: 4 });
+      h.spawn('enemy_dummy', { pos: [11, 7] });
+      assert.deepEqual([t.skill.rule, t.skill.spCost, t.skill.charges], ['DEFAULT', 0, 1], `T${tier} S${skill + 1}: free, ready`);
+      assert.ok(h.runUntil(() => t.skill.activations === 1, 1), `T${tier} S${skill + 1}: cast at its first attack`);
+      if (skill === 0) {
+        approx(t.s.atk, t.base.atk * (1 + tb.atk), `T${tier}: S1 copy ATK`);
+        h.run(20);
+        assert.ok(t.skill.active, `T${tier}: S1 copy stays`);
+        const hits = from(h, t);
+        const atk = t.base.atk * (1 + tb.atk);
+        assert.ok(hits.some((c) => Math.abs(c.amount - atk * tb.atk_scale) < 1e-6) && hits.some((c) => Math.abs(c.amount - atk) < 1e-6), `T${tier}: S1 copy procs ×${tb.atk_scale}`);
+      } else if (skill === 1) {
+        h.run(0.5);
+        const s2 = from(h, t).filter((c) => c.dmg.isSkill);
+        assert.deepEqual(s2.map((c) => [c.dmg.isAttack, c.dmg.tags.includes('dot')]), [[true, false], [false, true], [false, true]], `T${tier}: S2 copy`);
+        for (const c of s2) approx(c.amount, t.base.atk * tb.atk_scale, `T${tier}: S2 copy ×${tb.atk_scale}`);
+      } else {
+        assert.deepEqual(t.liveRangeGrid, [[0, 0], [0, 1], [0, 2], [0, 3], [0, 4]], `T${tier}: S3 copy 4-1`);
+        approx(t.s.interval, 1.0, `T${tier}: S3 copy interval`);
+        approx(t.skill.timeLeft, v.skill.duration, `T${tier}: ${v.skill.duration} s`, 0.05);
+        h.run(3);
+        for (const c of from(h, t).filter((x) => x.dmg.isSkill)) approx(c.amount, t.base.atk * tb['attack@atk_scale'], `T${tier}: S3 copy ×${tb['attack@atk_scale']}`);
+      }
+      h.run(24);
+      assert.equal(t.skill.activations, 1, `T${tier} S${skill + 1}: once per deployment`);
+      done(h);
+    }
+  }
+});
+
+test('弱点速记: every damage of the typewriter cuts the target\'s DEF 18 % for 4 s, 23 % on one of the 4 tiles next to 鸿雪 (not diagonal); ARC-X stage 3: 28 % / 33 % and the 8 tiles; 鸿雪 down ⇒ the base cut', () => {
+  for (const f of FORMS_ALL) {
+    const [tier, elite, mod] = f;
+    const x3 = tier === 6 && elite && mod === X;
+    const tal = tokOf(tier, elite, 2, elite ? mod : null).talents.find((x) => x && x.bb.duration);
+    const c1 = -tal.bb['bgsnow_token[def_down]_1.def'], c2 = -tal.bb['bgsnow_token[def_down]_2.def'];
+    assert.deepEqual([c1, c2, tal.bb.duration], x3 ? [0.28, 0.33, 4] : [0.18, 0.23, 4], label(f));
+    for (const [tile, near] of [[[11, 5], true], [[11, 4], x3], [[12, 3], false]]) {
+      const { h, u, t } = field({ tier, elite, mod, skill: 0, tok: tile, seed: 2 });
+      h.spawn('enemy_dummy', { pos: [tile[0], tile[1] + 2] });
+      h.run(4);
+      const cuts = h.hooksOf('statusApplied').filter((c) => c.source === t && c.status === 'defDown');
+      assert.ok(cuts.length >= 2, `${label(f)} ${tile}: cuts`);
+      for (const c of cuts) assert.deepEqual([c.value, c.duration], [near ? c2 : c1, 4], `${label(f)} ${tile}: ${near ? 'near' : 'apart'}`);
+      if (near) {
+        h.b.kill(u, null);
+        h.run(3);
+        const after = h.hooksOf('statusApplied').filter((c) => c.source === t && c.status === 'defDown').slice(cuts.length);
+        assert.ok(after.length && after.every((c) => c.value === c1), `${label(f)}: 鸿雪 down ⇒ ${c1}`);
+      }
+      done(h);
+    }
+  }
+});

test/content/op_shwaz.test.js

@@ -0,0 +1,269 @@
+// test/content/op_shwaz.test.js — the 自选 operator kit of 黑 (char_340_shwaz, 6★ 重射手; kit
+// server/sim/content/kits/ops/op-shwaz.js), fielded the production way (a DIY slot + its `diy` pick, simdata getDiy) in
+// every form: tiers 5 / 6, normal (E2 Lv1, skill rank 4, no module) and elite (E2 Lv60, rank 7) with no module, ARC-X
+// “定制弩配件套装” or ARC-Y “老剃刀” at stage 1 (tier 5) / 3 (tier 6). Every number is read back from data/backups.json (the
+// form of that slot status); the fidelity checklist of kits/README.md item by item.
+// Run: node --test test/content/op_shwaz.test.js
+
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import { makeBattle, enemyRec, checkInvariants } from '../helpers/battleHarness.js';
+import { KITTED_CHARS, OPERATOR_KITS, KITS } from '../../server/sim/content/kits/index.js';
+import { diyPool, validateDiyPicks } from '../../shared/diy.js';
+
+const load = (f) => JSON.parse(readFileSync(new URL(`../../data/${f}.json`, import.meta.url), 'utf8'));
+const CHESS = load('chess');
+const BACKUPS = load('backups');
+const SHWAZ = 'char_340_shwaz';
+const FORMS = BACKUPS.units[SHWAZ].forms;
+const SLOT = { 5: 'chess_char_5_diy1_a', 6: 'chess_char_6_diy1_a' };
+const X = 'uniequip_002_shwaz', Y = 'uniequip_003_shwaz';
+const S1 = 'skchr_shwaz_1', S2 = 'skchr_shwaz_2', S3 = 'skchr_shwaz_3';
+const PROVE = 'chess_char_1_07_a', YAK = 'chess_char_1_02_a';
+/** The unit form of a slot (tier, normal / elite). */
+const formOf = (tier, elite) => FORMS[elite ? (tier === 5 ? '2/60/7/1' : '2/60/7/3') : '2/1/4/0'];
+const skillOf = (tier, elite, id) => formOf(tier, elite).skills.find((s) => s.skillId === id);
+const modOf = (tier, mod) => (mod ? formOf(tier, true).modules.find((m) => m.uniEquipId === mod) : null);
+const approx = (a, b, msg, eps = 1e-6) => assert.ok(Math.abs(a - b) <= eps * Math.max(1, Math.abs(b)), `${msg}: ${a} vs ${b}`);
+const dummy = (key, o = {}) => enemyRec({ key, hp: 1e9, speed: 0, mass: 0, ...o });
+const ENEMIES = { enemy_dummy: dummy('enemy_dummy'), enemy_fly: dummy('enemy_fly', { motion: 'FLY' }) };
+/** Every 自选 form: [tier, elite, module]. */
+const FORMS_ALL = [[5, false, null], [6, false, null], ...[5, 6].flatMap((t) => [null, X, Y].map((m) => [t, true, m]))];
+/** 破甲箭头 of a form: the base talent, upgraded by ARC-Y's NAMED change only (stage 3: 170 % / −25 %). */
+const pierce = (tier, elite, mod) => ({ ...formOf(tier, elite).talents[0].bb, ...(modOf(tier, mod)?.talentChanges ?? []).filter((t) => t.talentIndex === 0 && t.name).reduce((o, t) => ({ ...o, ...t.bb }), {}) });
+
+/** A battle with 黑 as uid 1 at (row, col) facing RIGHT, plus `others`. */
+function field({ tier = 5, elite = false, mod = null, skill = 0, row = 10, col = 5, others = [], seed = 5, players = null } = {}) {
+  const h = makeBattle({
+    defs: { enemies: ENEMIES }, timeLimit: 900, autoFinish: false, seed,
+    flags: { dpPerSec: 0, dpMax: 999 }, hooks: ['damaged', 'skillStart', 'skillEnd', 'statusApplied', 'dodge'], captureNoisy: true,
+    ...(players ? { players } : { units: [{ uid: 1, diy: { slot: SLOT[tier], charId: SHWAZ, skillIndex: skill, uniEquipId: mod }, elite, row, col }, ...others] }),
+  });
+  h.step();
+  return { h, u: h.unit(1) };
+}
+const atkHits = (h, u) => h.hooksOf('damaged').filter((c) => c.source === u && c.dmg?.isAttack);
+function done(h) {
+  checkInvariants(h.b);
+  assert.equal(h.b.errors.length, 0, JSON.stringify(h.b.errors[0]));
+}
+const label = ([tier, elite, mod]) => `T${tier} ${elite ? 'elite' : 'normal'} ${mod ?? 'none'}`;
+
+test('黑 in every 自选 form: her operator kit (all three skills authored), the form\'s stats + module attributes, 3-6, ranged physical, hits air, blocks 1, ground-targetable, data triggers', () => {
+  assert.equal(OPERATOR_KITS[SHWAZ], KITS[SHWAZ]);
+  for (const f of FORMS_ALL) {
+    const [tier, elite, mod] = f;
+    for (const skill of [0, 1, 2]) {
+      const { h, u } = field({ tier, elite, mod, skill });
+      const form = formOf(tier, elite), m = elite ? modOf(tier, mod) : null;
+      assert.deepEqual([u.def.charId, u.def.diyFor, u.skill.id, !!u.kit.generic, u.kit.skillSource], [SHWAZ, SLOT[tier], form.skills[skill].skillId, false, 'skills'], label(f));
+      assert.deepEqual([u.base.maxHp, u.base.atk, u.base.def], [form.stats.maxHp + (m?.attr.maxHp ?? 0), form.stats.atk + (m?.attr.atk ?? 0), form.stats.def + (m?.attr.def ?? 0)], `${label(f)}: stats`);
+      // ARC-X “定制弩配件套装”: "再部署时间减少" — the attribute respawn_time −25 (70 → 45 s)
+      assert.equal(u.base.respawnTime, form.stats.respawnTime + (m?.attr.respawnTime ?? 0), `${label(f)}: redeploy time`);
+      assert.deepEqual([u.s.blockCnt, u.profile.attack, u.profile.canHitFly, u.profile.dmgType, u.base.bat], [1, 'ranged', true, 'phys', 1.6], `${label(f)}: 重射手`);
+      assert.deepEqual(u.liveRangeGrid, form.rangeGrid, `${label(f)}: 3-6`);
+      assert.ok(!u.s.flags.liftoff && !u.s.flags.camou && !u.s.flags.stealth, `${label(f)}: ground enemies target her`);
+      assert.equal(u.skill.rule, form.skills[skill].trigger.rule, `${label(f)}: the data's trigger`);
+      done(h);
+    }
+  }
+  // the data: all three DEFAULT (S3's 「攻击范围改为」 is an attack-range change, not a 技能范围 — tools/build-data.mjs
+  // ATTACK_RANGE_CHANGE); E2 Lv1 1393 / 646 / 164, Lv60 1685 / 775 / 204
+  assert.deepEqual(formOf(6, true).skills.map((s) => s.trigger.rule), ['DEFAULT', 'DEFAULT', 'DEFAULT']);
+  assert.deepEqual([FORMS['2/1/4/0'].stats.atk, FORMS['2/60/7/1'].stats.atk], [646, 775]);
+  assert.deepEqual([modOf(5, X).attr, modOf(6, X).attr, modOf(5, Y).attr, modOf(6, Y).attr],
+    [{ maxHp: 130, atk: 55, respawnTime: -25 }, { maxHp: 170, atk: 75, respawnTime: -25 }, { atk: 80, def: 10 }, { atk: 120, def: 16 }]);
+});
+
+test('a 自选 pick: 黑 is offered at tiers 5 and 6 (she has a kit) and a roster with her passes validateDiyPicks', () => {
+  const data = { chess: CHESS, backups: BACKUPS };
+  assert.ok(KITTED_CHARS.includes(SHWAZ));
+  for (const t of [5, 6]) assert.ok(diyPool(t, { data, kitted: KITTED_CHARS }).includes(SHWAZ), `tier ${t}`);
+  assert.deepEqual(validateDiyPicks({ [SLOT[6]]: { charId: SHWAZ, skillIndex: 2, uniEquipId: Y } }, { data, kitted: KITTED_CHARS }),
+    { ok: true, picks: { [SLOT[6]]: { charId: SHWAZ, skillIndex: 2, uniEquipId: Y } } });
+});
+
+test('S1 强弩 (AUTO, attack SP 4, data DEFAULT): every 5th attack ×175 % / 190 % ATK, 破甲箭头 then at 60 % / 70 % (20 % otherwise); air units are hit', () => {
+  for (const [tier, elite] of [[5, false], [6, true]]) {
+    const sk = skillOf(tier, elite, S1), t0 = pierce(tier, elite, null);
+    const { h, u } = field({ tier, elite, skill: 0, seed: 21 });
+    assert.deepEqual([u.skill.kind, u.skill.rule, u.skill.spCost, u.skill.spType, sk.bb.atk_scale, sk.bb['talent@prob']],
+      ['instant', 'DEFAULT', 4, 'attack', elite ? 1.9 : 1.75, elite ? 0.7 : 0.6], `T${tier}`);
+    h.spawn('enemy_fly', { pos: [10, 6] }); // a flyer in front: she hits air units
+    h.run(800);
+    const hits = atkHits(h, u);
+    const sk1 = hits.filter((c) => c.dmg.isSkill), plain = hits.filter((c) => !c.dmg.isSkill);
+    assert.ok(Math.abs(sk1.length * 5 - hits.length) <= 5, `T${tier}: one S1 attack in 5 (${sk1.length} / ${hits.length})`);
+    const base = u.s.atk;
+    for (const c of sk1) assert.ok([base * sk.bb.atk_scale, base * sk.bb.atk_scale * t0.atk_scale].some((v) => Math.abs(c.amount - v) < 1e-6), `T${tier}: S1 hit ${c.amount}`);
+    for (const c of plain) assert.ok([base, base * t0.atk_scale].some((v) => Math.abs(c.amount - v) < 1e-6), `T${tier}: plain hit ${c.amount}`);
+    const rate = (list, scale) => list.filter((c) => c.amount > base * scale + 1e-6).length / list.length;
+    const r1 = rate(sk1, sk.bb.atk_scale), r0 = rate(plain, 1);
+    assert.ok(Math.abs(r1 - sk.bb['talent@prob']) < 0.12, `T${tier}: 破甲箭头 on S1 ${r1}`);
+    assert.ok(Math.abs(r0 - t0.prob) < 0.07, `T${tier}: 破甲箭头 otherwise ${r0}`);
+    assert.ok(hits.every((c) => c.type === 'phys' && c.target.motion === 'FLY'), `T${tier}: physical, on the flyer`);
+    done(h);
+  }
+});
+
+test('S2 暮眼锐瞳 (MANUAL, data DEFAULT): ATK +85 % / +100 % for 33 / 36 s, 破甲箭头 at 40 % / 45 % meanwhile; no cast without an enemy', () => {
+  for (const [tier, elite] of [[5, false], [6, true]]) {
+    const sk = skillOf(tier, elite, S2), t0 = pierce(tier, elite, null);
+    const { h, u } = field({ tier, elite, skill: 1, seed: 8 });
+    assert.deepEqual([u.skill.kind, u.skill.rule, sk.duration, sk.bb.atk, sk.bb['talent@prob']], ['duration', 'DEFAULT', elite ? 36 : 33, elite ? 1 : 0.85, elite ? 0.45 : 0.4], `T${tier}`);
+    u.skill.gainSp(999);
+    h.run(2);
+    assert.equal(u.skill.activations, 0, `T${tier}: no enemy, no cast`);
+    h.spawn('enemy_dummy', { pos: [10, 7] });
+    assert.ok(h.runUntil(() => u.skill.active, 3), `T${tier}: cast with an enemy in range`);
+    approx(u.skill.timeLeft, sk.duration, `T${tier}: ${sk.duration} s`, 0.01);
+    approx(u.s.atk, u.base.atk * (1 + sk.bb.atk), `T${tier}: ATK +${sk.bb.atk * 100} %`);
+    const n0 = atkHits(h, u).length;
+    u.skill.extend(600);
+    h.runUntil(() => !u.skill.active, 700);
+    const during = atkHits(h, u).slice(n0);
+    const atk = u.base.atk * (1 + sk.bb.atk);
+    assert.ok(during.length > 300 && during.every((c) => c.dmg.isSkill), `T${tier}: ${during.length} attacks, marked`);
+    const r = during.filter((c) => c.amount > atk + 1e-6).length / during.length;
+    assert.ok(Math.abs(r - sk.bb['talent@prob']) < 0.07, `T${tier}: 破甲箭头 ${r}`);
+    for (const c of during.slice(0, 20)) assert.ok([atk, atk * t0.atk_scale].some((v) => Math.abs(c.amount - v) < 1e-6), `T${tier}: ${c.amount}`);
+    approx(u.s.atk, u.base.atk, `T${tier}: ATK back`);
+    done(h);
+  }
+});
+
+test('S3 战术的终结: range 3-2 while it runs (and back), interval 1.6 + 0.4 s, ATK +120 % / +140 %, 破甲箭头 on every attack; the basic strategy (DEFAULT): an enemy she is about to attack casts it, then only the 3-2 line is attacked', () => {
+  for (const [tier, elite] of [[5, false], [6, true]]) {
+    const sk = skillOf(tier, elite, S3), t0 = pierce(tier, elite, null);
+    assert.deepEqual(sk.rangeGrid, [[0, 0], [0, 1], [0, 2], [0, 3]]);
+    const { h, u } = field({ tier, elite, skill: 2, seed: 4 });
+    assert.deepEqual([u.skill.kind, u.skill.rule, sk.duration, sk.bb.atk, sk.bb.base_attack_time, sk.bb['talent@prob']],
+      ['duration', 'DEFAULT', elite ? 21 : 18, elite ? 1.4 : 1.2, 0.4, 1], `T${tier}`);
+    u.skill.gainSp(999);
+    const side = h.spawn('enemy_dummy', { pos: [11, 6] }); // in 3-6, not in 3-2
+    assert.ok(h.runUntil(() => u.skill.active, 3), `T${tier}: cast as she is about to attack the 3-6 enemy (DEFAULT)`);
+    const far = h.spawn('enemy_dummy', { pos: [10, 8] }); // 3 tiles ahead: 3-2, outside 3-6
+    assert.deepEqual(u.liveRangeGrid, sk.rangeGrid, `T${tier}: range 3-2 while it runs`);
+    approx(u.s.interval, 2.0, `T${tier}: interval +0.4 s`);
+    approx(u.s.atk, u.base.atk * (1 + sk.bb.atk), `T${tier}: ATK`);
+    const n0 = atkHits(h, u).length;
+    h.runUntil(() => !u.skill.active, 30);
+    const during = atkHits(h, u).slice(n0);
+    assert.ok(during.length >= 8 && during.every((c) => c.target === far), `T${tier}: only the 3-2 enemy, not the side one (${during.length})`);
+    for (const c of during) approx(c.amount, u.base.atk * (1 + sk.bb.atk) * t0.atk_scale, `T${tier}: every attack procs`);
+    const cuts = h.hooksOf('statusApplied').filter((c) => c.source === u && c.status === 'defDown' && c.target === far);
+    assert.ok(cuts.length >= during.length - 1, `T${tier}: DEF cut each time`);
+    assert.deepEqual(u.liveRangeGrid, formOf(tier, elite).rangeGrid, `T${tier}: back to 3-6`);
+    approx(u.s.interval, 1.6, `T${tier}: interval back`);
+    done(h);
+  }
+});
+
+test('T1 破甲箭头: a proc ×160 % (ARC-Y stage 3: 170 %) and, once it hit, DEF ×0.8 (×0.75) for 5 s (defDown); ARC-Y stage 1 keeps 160 % (its hidden trait part is not 破甲箭头); a dodged attack cuts nothing', () => {
+  for (const f of FORMS_ALL) {
+    const [tier, elite, mod] = f;
+    const t0 = pierce(tier, elite, mod);
+    assert.deepEqual([t0.atk_scale, t0.def, t0.prob, t0.defdown_duration], tier === 6 && mod === Y ? [1.7, -0.25, 0.2, 5] : [1.6, -0.2, 0.2, 5], label(f));
+    const { h, u } = field({ tier, elite, mod, skill: 2, seed: 13 });
+    const e = h.spawn('enemy_dummy', { pos: [11, 6] }); // off her front line: no ARC-Y bonus
+    h.run(120);
+    const hits = atkHits(h, u).filter((c) => c.target === e);
+    const procs = hits.filter((c) => c.amount > u.s.atk + 1e-6);
+    assert.ok(procs.length > 5 && procs.length < hits.length * 0.4, `${label(f)}: ${procs.length} / ${hits.length}`);
+    for (const c of procs) approx(c.amount, u.s.atk * t0.atk_scale, `${label(f)}: ×${t0.atk_scale}`);
+    const cuts = h.hooksOf('statusApplied').filter((c) => c.source === u && c.status === 'defDown');
+    assert.equal(cuts.length, procs.length, `${label(f)}: one DEF cut per proc`);
+    for (const c of cuts) assert.deepEqual([c.value, c.duration], [-t0.def, t0.defdown_duration], label(f));
+    // a dodged attack: no hit, no cut
+    const d = h.spawn('enemy_dummy', { pos: [9, 6] });
+    h.b.addBuff(d, { key: 'test:dodge', mods: { dodgePhys: 1 } });
+    h.b.kill(e, null);
+    const c0 = cuts.length;
+    h.run(60);
+    assert.ok(h.hooksOf('dodge').filter((c) => c.source === u).length > 20, `${label(f)}: dodged`);
+    assert.equal(h.hooksOf('statusApplied').filter((c) => c.source === u && c.status === 'defDown').length, c0, `${label(f)}: nothing cut`);
+    done(h);
+  }
+});
+
+test('T2 交叉火力: with another 【狙击】 operator on the field every sniper (her too, a partner\'s too) ATK +8 % — not 角峰, not alone, not once she leaves; ARC-X stage 3 "携带": +13 % on her player\'s snipers for the whole battle', () => {
+  for (const f of FORMS_ALL) {
+    const [tier, elite, mod] = f;
+    const squad = tier === 6 && mod === X;
+    const v = squad ? 0.13 : 0.08;
+    const t1 = { ...formOf(tier, elite).talents[1].bb, ...(modOf(tier, mod)?.talentChanges ?? []).filter((t) => t.talentIndex === 1).reduce((o, t) => ({ ...o, ...t.bb }), {}) };
+    assert.equal(t1.atk, v, label(f));
+    // alone: nothing
+    const solo = field({ tier, elite, mod, skill: 0 });
+    solo.h.run(1);
+    assert.equal(solo.u.findBuff('talent:shwaz:crossfire'), null, `${label(f)}: alone`);
+    done(solo.h);
+    const { h, u } = field({ tier, elite, mod, skill: 0, others: [{ uid: 2, chessId: PROVE, row: 12, col: 3 }, { uid: 3, chessId: YAK, row: 9, col: 3 }] });
+    h.run(1);
+    const prove = h.unit(2), yak = h.unit(3);
+    for (const a of [u, prove]) assert.deepEqual(a.findBuff('talent:shwaz:crossfire')?.mods, { atkPct: v }, `${label(f)}: ${a.def.name}`);
+    assert.equal(yak.findBuff('talent:shwaz:crossfire'), null, `${label(f)}: 角峰 (重装)`);
+    approx(u.s.atk, u.base.atk * (1 + v), `${label(f)}: her ATK`);
+    h.b.retreat(prove);
+    h.run(1);
+    assert.equal(!!u.findBuff('talent:shwaz:crossfire'), squad, `${label(f)}: 普罗旺斯 off the field (携带: still in the squad)`);
+    h.b.redeploy(prove);
+    h.run(1);
+    h.b.retreat(u);
+    h.run(1);
+    assert.equal(!!prove.findBuff('talent:shwaz:crossfire'), squad, `${label(f)}: 黑 off the field`);
+    done(h);
+  }
+  // a partner's sniper on a shared field: the field version counts it and buffs it; the squad version does not
+  const pair = (mod, tier) => field({ players: [
+    { playerId: 'p1', seat: 0, side: 'L', colOffset: 0, units: [{ uid: 1, kind: 'chess', chessId: tier === 6 ? 'chess_char_6_diy1_b' : 'chess_char_5_diy1_b', diy: { charId: SHWAZ, skillIndex: 0, uniEquipId: mod }, row: 10, col: 5 }], bonds: {}, bandId: null, playerEffects: [] },
+    { playerId: 'p2', seat: 1, side: 'L', colOffset: 0, units: [{ uid: 1, kind: 'chess', chessId: PROVE, row: 12, col: 3 }], bonds: {}, bandId: null, playerEffects: [] },
+  ] });
+  for (const [mod, tier, want] of [[null, 6, 0.08], [X, 6, null]]) {
+    const { h } = pair(mod, tier);
+    h.run(1);
+    const mine = h.b.allyUnits.find((a) => a.ownerId === 'p1'), theirs = h.b.allyUnits.find((a) => a.ownerId === 'p2');
+    assert.equal(mine.findBuff('talent:shwaz:crossfire')?.mods.atkPct ?? null, want, `${mod ?? 'none'}: 黑`);
+    assert.equal(theirs.findBuff('talent:shwaz:crossfire')?.mods.atkPct ?? null, want, `${mod ?? 'none'}: the partner's 普罗旺斯`);
+    done(h);
+  }
+});
+
+test('ARC-Y 老剃刀 trait: an enemy on her straight line ahead takes ×105 % and cannot dodge (stages 1 and 3); off the line it dodges; ARC-X / no module change nothing; facing UP turns the line', () => {
+  for (const f of FORMS_ALL) {
+    const [tier, elite, mod] = f;
+    const y = elite && mod === Y;
+    if (y) assert.deepEqual(formOf(tier, true).modules.find((m) => m.uniEquipId === Y).traitOverride.bb, { atk_scale: 1.05 }, label(f));
+    const { h, u } = field({ tier, elite, mod, skill: 0, seed: 3 });
+    u.skill.sp = 0; u.skill.charges = 0;
+    const front = h.spawn('enemy_dummy', { pos: [10, 7] });
+    const side = h.spawn('enemy_dummy', { pos: [11, 7] });
+    for (const e of [front, side]) h.b.addBuff(e, { key: 'test:dodge', mods: { dodgePhys: 1 } });
+    h.run(40);
+    const onFront = atkHits(h, u).filter((c) => c.target === front);
+    const dodged = h.hooksOf('dodge').filter((c) => c.source === u);
+    if (y) {
+      assert.ok(onFront.length > 10, `${label(f)}: the front enemy is hit (${onFront.length})`);
+      for (const c of onFront.filter((x) => !x.dmg.isSkill)) assert.ok([u.s.atk * 1.05, u.s.atk * 1.05 * pierce(tier, elite, mod).atk_scale].some((v) => Math.abs(c.amount - v) < 1e-6), `${label(f)}: ×1.05 (${c.amount})`);
+      h.b.kill(front, null);
+      h.run(10);
+      assert.ok(h.hooksOf('dodge').filter((c) => c.source === u && c.target === side).length > 3, `${label(f)}: off the line it dodges`);
+    } else {
+      assert.equal(onFront.length, 0, `${label(f)}: no bonus — every attack dodged`);
+      assert.ok(dodged.length > 10, label(f));
+    }
+    done(h);
+  }
+  // facing UP: the line is the column above her
+  const h = makeBattle({ defs: { enemies: ENEMIES }, timeLimit: 60, autoFinish: false, seed: 2, flags: { dpPerSec: 0 }, hooks: ['damaged'], captureNoisy: true,
+    units: [{ uid: 1, diy: { slot: 6, charId: SHWAZ, skillIndex: 0, uniEquipId: Y }, elite: true, row: 10, col: 5, dir: 'UP' }] });
+  h.step();
+  const u = h.unit(1);
+  const e = h.spawn('enemy_dummy', { pos: [12, 5] });
+  h.run(20);
+  const plain = h.hooksOf('damaged').filter((c) => c.source === u && c.target === e && !c.dmg.isSkill);
+  assert.ok(plain.length > 5);
+  for (const c of plain) assert.ok([1.05, 1.05 * pierce(6, true, Y).atk_scale].some((k) => Math.abs(c.amount - u.base.atk * k) < 1e-6), `UP: two tiles above her is her line (${c.amount})`);
+  done(h);
+});

test/golden/diy.json

@@ -1560,126 +1560,132 @@
       "snaps": "08ec0e9b d4419c45 56a2bcb4 9e752221 efa858fd 0b8e0f61 07fd1174 33d5625e 3bcffa82 6bdfc54a 70fb78b8 6b78ec10 bb3a00e7 79fe9836 bfc1fad7 93de838f 3b2411a2 2abcc04e 5ed202f1 f86b9678 44fac894 5dffdeda 38dc3675"
     },
     "diy-039": {
-      "about": "6_diy1_b=huang/S1/002_huang 6_diy2_b=huang/S2/002_huang 6_diy1_b=huang/S3/002_huang 6_diy2_b=huang/S1/003_huang 6_diy1_b=huang/S2/003_huang 6_diy2_b=huang/S3/003_huang 5_diy1_a=cdfend 5_diy2_b=cdfend 5_diy1_a=cguard 5_diy2_b=cguard 5_diy1_a=csnipe 5_diy2_b=csnipe",
-      "fast": true,
+      "about": "6_diy1_b=huang/S1/002_huang 6_diy2_b=huang/S2/002_huang 6_diy1_b=huang/S3/002_huang 6_diy2_b=huang/S1/003_huang 6_diy1_b=huang/S2/003_huang 6_diy2_b=huang/S3/003_huang 5_diy1_a=shwaz/S1 5_diy2_a=shwaz/S2 5_diy1_a=shwaz/S3 5_diy2_b=shwaz/S1 5_diy1_b=shwaz/S2 5_diy2_b=shwaz/S3",
+      "fast": false,
       "kind": "normal",
       "stageId": "act1autochess_m06",
       "modeId": "mode_single_normal",
       "round": 13,
       "seed": 1549362176,
       "waveId": "act1autochess_h06",
-      "time": 221.33,
-      "ticks": 6640,
+      "time": 214.83,
+      "ticks": 6445,
       "reason": "cleared",
-      "killed": 27,
+      "killed": 25,
       "total": 132,
       "unspawned": 0,
       "bossHpLeft": null,
-      "rngDraws": 0,
+      "rngDraws": 87,
       "errors": {"count":0,"kinds":[]},
-      "players": {"p1":{"killed":27,"total":132,"perfect":false,"leaks":105,"leaksUncounted":0,"coins":0,"dmg":272890,"bossDmg":0,"heal":23304,"deaths":22,"layerGains":{}}},
+      "players": {"p1":{"killed":25,"total":132,"perfect":false,"leaks":107,"leaksUncounted":0,"coins":0,"dmg":295753,"bossDmg":0,"heal":21810,"deaths":21,"layerGains":{}}},
       "units": [
-        ["p1",1,"op","chess_char_6_diy1_b",0,"uniequip_002_huang",0,0,2,5,52981,4302,1434,24,6],
-        ["p1",2,"op","chess_char_6_diy2_b",1,"uniequip_002_huang",0,0,7,0,0,4302,1434,0,1],
-        ["p1",3,"op","chess_char_6_diy1_b",2,"uniequip_002_huang",0,0,111,0,0,8604,2868,0,0],
-        ["p1",4,"op","chess_char_6_diy2_b",0,"uniequip_003_huang",0,0,86,5,74003,11712,5856,36,9],
-        ["p1",5,"op","chess_char_6_diy1_b",1,"uniequip_003_huang",0,0,128,3,25035,11712,5856,33,0],
-        ["p1",6,"op","chess_char_6_diy2_b",2,"uniequip_003_huang",0,0,98,6,52825,11712,5856,24,2],
-        ["p1",7,"op","chess_char_5_diy1_a",2,null,979,1,153,1,2665,5405,0,20,0],
-        ["p1",8,"op","chess_char_5_diy2_b",2,"none",0,0,4,0,4712,2908,0,38,1],
-        ["p1",9,"op","chess_char_5_diy1_a",2,null,0,0,155,1,15620,7692,0,22,1],
-        ["p1",10,"op","chess_char_5_diy2_b",2,"none",0,0,143,0,2653,6668,0,2,1],
-        ["p1",11,"op","chess_char_5_diy1_a",2,null,0,0,136,2,17302,2542,0,63,1],
-        ["p1",12,"op","chess_char_5_diy2_b",2,"none",1510,1,156,4,25093,3020,0,70,1]
+        ["p1",1,"op","chess_char_6_diy1_b",0,"uniequip_002_huang",0,0,134,7,62379,8604,2868,30,6],
+        ["p1",2,"op","chess_char_6_diy2_b",1,"uniequip_002_huang",0,0,6,0,0,4302,1434,0,1],
+        ["p1",3,"op","chess_char_6_diy1_b",2,"uniequip_002_huang",0,0,107,0,0,8604,2868,0,0],
+        ["p1",4,"op","chess_char_6_diy2_b",0,"uniequip_003_huang",0,0,87,5,74810,11712,5856,37,9],
+        ["p1",5,"op","chess_char_6_diy1_b",1,"uniequip_003_huang",0,0,7,0,9260,5856,2928,16,0],
+        ["p1",6,"op","chess_char_6_diy2_b",2,"uniequip_003_huang",0,0,97,6,51087,11712,5856,24,2],
+        ["p1",7,"op","chess_char_5_diy1_a",0,null,0,0,144,0,0,2786,0,0,0],
+        ["p1",8,"op","chess_char_5_diy2_a",1,null,0,0,152,1,22019,2786,0,22,1],
+        ["p1",9,"op","chess_char_5_diy1_a",2,null,1393,1,154,2,32606,1393,0,29,2],
+        ["p1",10,"op","chess_char_5_diy2_b",0,"none",0,0,114,1,6128,3370,0,8,1],
+        ["p1",11,"op","chess_char_5_diy1_b",1,"none",0,0,93,3,22259,3370,0,19,1],
+        ["p1",12,"op","chess_char_5_diy2_b",2,"none",0,0,85,0,15205,3370,0,10,1]
       ],
-      "enemies": {"enemy_1019_jshoot_2":[57,15,42,6830,79336],"enemy_1381_winman":[27,9,18,2379,101941],"enemy_1389_winbab_2":[48,3,45,70638,91612]},
-      "hooks": [1,156,6640,1321,1321,1459,1460,16,49,154,23,23,0,15923,9,56,132,105,1,49,0,0,0],
-      "events": {"atk":1462,"deploy":24,"die":49,"dmg":954,"fx":30,"heal":16,"leak":105,"skill":46,"spawn":144,"status":22},
-      "fx": {"aoe":13,"buff":1,"heal":16},
-      "snaps": "2fa44821 69a68226 b2cef126 7d2e5fb3 62dbdb20 72209675 acef606d 006470ea b21fe529 3ab7999a da964e75 1209cd30 9e6da239 ba028ddc 84454051 a38b0cf9 8cea238e e7ce450d ad612988 504a7c00 caaecf97 9d741f38 89306431"
+      "enemies": {"enemy_1019_jshoot_2":[57,13,44,5282,72855],"enemy_1381_winman":[27,7,20,1770,107737],"enemy_1389_winbab_2":[48,5,43,60081,115162]},
+      "hooks": [1,154,6445,1018,1018,1137,1138,15,46,153,24,24,0,11532,35,51,132,107,1,46,0,0,0],
+      "events": {"atk":1148,"deploy":22,"die":46,"dmg":687,"fx":60,"heal":15,"leak":107,"skill":48,"spawn":144,"status":43},
+      "fx": {"aoe":13,"buff":1,"crit":31,"heal":15},
+      "snaps": "63799646 193a03bc e02a11dc 263432bc 9f6b3637 9bf602dd c0f31b96 bae8b88d 6ca39ae3 684fe9a9 36891e10 66784112 997d4983 72fdd9e0 4d3f0646 362e0e80 435d205e cc2c1c2f 4c433ad5 66329e55 2c1a2ed6 6204ef02"
     },
     "diy-040": {
-      "about": "5_diy1_a=acfend 5_diy2_b=acfend 5_diy1_a=acpion 5_diy2_b=acpion 5_diy1_a=acguad 5_diy2_b=acguad 5_diy1_a=ccast 5_diy2_b=ccast 5_diy1_a=cmedic 5_diy2_b=cmedic 5_diy1_a=csuppo 5_diy2_b=csuppo",
+      "about": "5_diy1_b=shwaz/S1/002_shwaz 5_diy2_b=shwaz/S2/002_shwaz 5_diy1_b=shwaz/S3/002_shwaz 5_diy2_b=shwaz/S1/003_shwaz 5_diy1_b=shwaz/S2/003_shwaz 5_diy2_b=shwaz/S3/003_shwaz 6_diy1_a=shwaz/S1 6_diy2_a=shwaz/S2 6_diy1_a=shwaz/S3 6_diy2_b=shwaz/S1 6_diy1_b=shwaz/S2 6_diy2_b=shwaz/S3",
       "fast": false,
       "kind": "normal",
       "stageId": "act1autochess_m07",
       "modeId": "mode_multi_abyss",
-      "round": 12,
+      "round": 13,
       "seed": 4204057621,
-      "waveId": "act1autochess_h05",
-      "time": 230,
-      "ticks": 6900,
-      "reason": "timeout",
-      "killed": 0,
-      "total": 60,
+      "waveId": "act1autochess_h06",
+      "time": 201.23,
+      "ticks": 6037,
+      "reason": "cleared",
+      "killed": 29,
+      "total": 124,
       "unspawned": 0,
       "bossHpLeft": null,
-      "rngDraws": 24,
+      "rngDraws": 614,
       "errors": {"count":0,"kinds":[]},
-      "players": {"p1":{"killed":0,"total":60,"perfect":false,"leaks":60,"leaksUncounted":0,"coins":0,"dmg":228914,"bossDmg":0,"heal":0,"deaths":15,"layerGains":{}}},
+      "players": {"p1":{"killed":29,"total":124,"perfect":false,"leaks":95,"leaksUncounted":0,"coins":0,"dmg":596134,"bossDmg":0,"heal":0,"deaths":4,"layerGains":{}}},
       "units": [
-        ["p1",1,"op","chess_char_5_diy1_a",2,null,0,0,82,0,71,7812,0,5,0],
-        ["p1",2,"op","chess_char_5_diy2_b",2,"uniequip_002_acfend",675.54,1,84,0,2254,9437,0,52,2],
-        ["p1",3,"op","chess_char_5_diy1_a",2,null,0,0,80,0,2618,4587,0,10,1],
-        ["p1",4,"op","chess_char_5_diy2_b",2,"uniequip_002_acpion",0,0,78,0,4995,5712,0,17,1],
-        ["p1",5,"op","chess_char_5_diy1_a",2,null,2638,1,85,0,1003,5276,0,12,0],
-        ["p1",6,"op","chess_char_5_diy2_b",2,"uniequip_002_acguad",3411,1,86,0,29363,6822,0,29,1],
-        ["p1",7,"op","chess_char_5_diy1_a",2,null,1133,1,4,0,40162,0,0,86,3],
-        ["p1",8,"op","chess_char_5_diy2_b",2,"none",1360,1,7,0,47763,0,0,87,3],
-        ["p1",9,"op","chess_char_5_diy1_a",2,null,1218,1,9,0,0,0,0,0,0],
-        ["p1",10,"op","chess_char_5_diy2_b",2,"none",1374,1,11,0,0,0,0,0,0],
-        ["p1",11,"op","chess_char_5_diy1_a",2,null,932,1,13,0,29230,0,0,74,2],
-        ["p1",12,"op","chess_char_5_diy2_b",2,"none",1131,1,5,0,71456,0,0,154,4],
+        ["p1",1,"op","chess_char_5_diy1_b",0,"uniequip_002_shwaz",1815,1,5,5,33000,0,0,43,8],
+        ["p1",2,"op","chess_char_5_diy2_b",1,"uniequip_002_shwaz",1815,1,7,5,39152,0,0,41,2],
+        ["p1",3,"op","chess_char_5_diy1_b",2,"uniequip_002_shwaz",1815,1,9,0,17507,0,0,16,3],
+        ["p1",4,"op","chess_char_5_diy2_b",0,"uniequip_003_shwaz",1685,1,11,0,44820,0,0,39,7],
+        ["p1",5,"op","chess_char_5_diy1_b",1,"uniequip_003_shwaz",1685,1,13,0,43434,0,0,33,2],
+        ["p1",6,"op","chess_char_5_diy2_b",2,"uniequip_003_shwaz",1685,1,6,0,62610,0,0,64,4],
+        ["p1",7,"op","chess_char_6_diy1_a",0,null,1393,1,8,5,18820,0,0,43,8],
+        ["p1",8,"op","chess_char_6_diy2_a",1,null,1393,1,10,0,125278,0,0,114,3],
+        ["p1",9,"op","chess_char_6_diy1_a",2,null,1393,1,12,0,52933,0,0,72,4],
+        ["p1",10,"op","chess_char_6_diy2_b",0,"none",1685,1,14,0,122754,0,0,106,21],
+        ["p1",11,"op","chess_char_6_diy1_b",1,"none",0,0,83,9,12604,3370,0,28,2],
+        ["p1",12,"op","chess_char_6_diy2_b",2,"none",0,0,82,5,23220,3370,0,23,2],
         ["-","~1","device","trap_1105_accrate",null,null,100,1,1,0,0,0,0,0,null],
         ["-","~2","device","trap_1105_accrate",null,null,100,1,2,0,0,0,0,0,null]
       ],
-      "enemies": {"enemy_1045_hammer_2":[12,0,12,11679,29920],"enemy_1061_zomshd":[48,0,47,27967,198994]},
-      "hooks": [1,86,6900,614,614,638,630,18665,15,74,17,15,0,23511,230,32,60,59,1,17,0,0,8],
-      "events": {"atk":614,"deploy":24,"die":15,"dmg":630,"fx":30,"leak":59,"skill":32,"spawn":74,"status":464},
-      "fx": {"aoe":4,"dodge":8,"dp":2,"slash":16},
-      "snaps": "55d29c01 137a0f46 4141bbfd 7089b49a ee191823 68945e1a 43ec812f d17c03a8 01486d26 5b26dde8 ce02b619 845c68e2 379c94bf f6905a41 8bec372a e1f60831 bf9ad198 ed155d25 e54254a4 a2e404f1 e9112874 40dca7a0 65049e51"
+      "enemies": {
+        "enemy_1195_sfyin": [39,2,37,400,200384],
+        "enemy_1196_msfyin": [4,4,0,0,8],
+        "enemy_1197_sfshu": [48,7,41,1259,333965],
+        "enemy_1198_msfshu": [21,16,5,0,50],
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