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docs/NPC_CRITICAL_BLOCK_IMPORTS_2026-10-06.md

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+# Ordinary Creature Critical Block imports — 2026-10-06
+
+## Import boundary
+
+`src/game/enemyBlockAuras.ts` keeps
+`supportedEnemyBlockAuraDefinition` fail-closed for Critical Block
+(47294–47296) and Deterrence. The separate
+`ordinaryCreatureSelfTargetCriticalBlockAuraDefinition` guard admits only
+Critical Block after the caller supplies an
+`EnemyNpcCriticalBlockImportProof` for one ordinary Creature self-cast. The
+defender, caster, and target IDs must be the same nonempty ID; the proof must
+explicitly identify an ordinary Creature and exclude a native defender, a
+summon, and a character defender. It also carries the bounded applicability
+token `azerothcore-e822d718-default-spellmod-path`.
+
+The guard validates the complete raw spell signature, runtime contract, block
+chance, and the exact aura-107 sibling list against the reviewed profile/rank
+row before returning an aura-253 runtime definition. Aura 107 stays present in
+the source signature and unsupported-effect metadata. Its no-op behavior is
+specific to the reviewed default core path; a custom aura script/module or a
+private server override invalidates that applicability proof. The WoW,
+Ascension, and Epoch labels identify client DBC rows. They do not certify
+private server overrides for those clients. Player and party casts must never
+use this full-import guard.
+
+## Reviewed Spell.dbc signatures
+
+Each listed effect is type 6, mechanic 0, target A/B 1/0, radius 0, period 0;
+spell range index is 1, school mask is 1, damage class is 0, duration is
+permanent (`-1` in the raw signature), and stack amount is 0. The parsed
+`basePoints` below are the client amount (`Spell.dbc` base-points field plus
+one). The Spell.dbc hashes and source paths are pinned in
+`NPC_BLOCK_AURA_PARITY_2026-10-06.md`.
+
+| Profile | Spell | Aura effects (`auraType:basePoints:miscValue`) |
+| --- | ---: | --- |
+| WoW 3.3.5a | 47294 | `253:20:0`, `107:5:7` |
+| WoW 3.3.5a | 47295 | `253:40:0`, `107:10:7` |
+| WoW 3.3.5a | 47296 | `253:60:0`, `107:15:7` |
+| Ascension | 47294 | `253:100:0`, `107:4:7`, `107:8:3` |
+| Ascension | 47295 | `253:100:0`, `107:7:7`, `107:16:3` |
+| Ascension | 47296 | `253:100:0`, `107:10:7`, `107:25:3` |
+| Epoch | 47294 | `253:20:0`, `107:5:7` |
+| Epoch | 47295 | `253:40:0`, `107:10:7` |
+| Epoch | 47296 | `253:60:0`, `107:15:7` |
+
+Aura 253 supplies the modeled critical-block chance. Aura 107 is
+`SPELL_AURA_ADD_FLAT_MODIFIER`; misc 7 is the spell critical-chance modifier,
+and Ascension also has misc 3 (`SPELLMOD_EFFECT1`). In the pinned AzerothCore
+checkout at commit `e822d718322289dd036fb2daf8867ba41283bf9a`,
+`SpellAuraEffects.cpp:780` sends aura spell modifiers through `ApplySpellMod`.
+`ApplySpellMod` returns at lines 813–816 when the target is not a player, so
+these aura-107 spell modifiers do not apply to an ordinary Creature on that
+default path. This evidence does not cover custom aura scripts, custom modules,
+or external server changes.
+
+## Source assignment availability
+
+The pinned AzerothCore base `creature_template_spell.sql` dump and checked
+`db_world` SQL updates contain no `Spell` assignment for 47294, 47295, or
+47296. This pass adds an importer guard and its evidence only; it does not
+assign Critical Block to a creature. A real source creature assignment is
+still required before any NPC receives the buff. Do not infer or fabricate one
+from the player talent spell rows.
+
+Deterrence remains outside the full importer because its source signatures
+also contain effects (including aura 185 or aura 27) that are not represented
+by ordinary NPC block inputs.
+
+## Focused coverage
+
+`src/game/enemyBlockAuras.test.ts` covers all three ranks in all three client
+profiles, missing and malformed proof, mismatched self-target IDs, native,
+summoned, and character-defender exclusions, the pinned applicability token,
+generic importer fail-closed behavior, Deterrence exclusion, and raw signature
+drift. The focused command is:
+
+```text
+npx vitest run src/game/enemyBlockAuras.test.ts
+```
+
+`combatStore.ts` uses this guard only for an ordinary source Creature's
+self-target descriptor with a known template entry. The compiler pins all
+three rank signatures in Ascension/Epoch, including aura-107 siblings, and
+validates them even when no source NPC assignment uses them. Its duration-index
+0 parser sentinel is 0; the guarded runtime definition normalizes the source
+permanent aura to an `expiresAt=null` lifetime.
+
+`enemyCriticalBlockImport.integration.test.ts` passes two actual runtime tests:
+a clearly labeled synthetic self-cast applies the permanent aura without
+damage, produces a deterministic critical block, and clears on reset; native,
+summoned, character and non-self fixtures are excluded. This synthetic fixture
+does not establish a real creature assignment. Regenerated campaign data is
+byte-for-byte unchanged from this pass's starting snapshot.