Core/Spells: Implemented SPELL_ATTR3_IGNORE_HIT_RESULT. Spells with this attribute will only be subject to own spell modifiers, ignoring enemy avoidance auras such as Cloak of Shadows or Deterrence

src/server/game/Entities/Unit/Unit.cpp

@@ -2304,6 +2304,11 @@ int32 Unit::GetMechanicResistChance(const SpellEntry *spell)
 // Melee based spells hit result calculations
 SpellMissInfo Unit::MeleeSpellHitResult(Unit *pVictim, SpellEntry const *spell)
 {
+    // Spells with SPELL_ATTR3_IGNORE_HIT_RESULT will additionally fully ignore
+    // resist and deflect chances
+    if (spell->AttributesEx3 & SPELL_ATTR3_IGNORE_HIT_RESULT)
+        return SPELL_MISS_NONE;
+
     WeaponAttackType attType = BASE_ATTACK;
 
     // Check damage class instead of attack type to correctly handle judgements
@@ -2488,22 +2493,28 @@ SpellMissInfo Unit::MagicSpellHitResult(Unit *pVictim, SpellEntry const *spell)
     // Spellmod from SPELLMOD_RESIST_MISS_CHANCE
     if (Player *modOwner = GetSpellModOwner())
         modOwner->ApplySpellMod(spell->Id, SPELLMOD_RESIST_MISS_CHANCE, modHitChance);
+
     // Increase from attacker SPELL_AURA_MOD_INCREASES_SPELL_PCT_TO_HIT auras
     modHitChance += GetTotalAuraModifierByMiscMask(SPELL_AURA_MOD_INCREASES_SPELL_PCT_TO_HIT, schoolMask);
-    // Chance hit from victim SPELL_AURA_MOD_ATTACKER_SPELL_HIT_CHANCE auras
+
-    modHitChance += pVictim->GetTotalAuraModifierByMiscMask(SPELL_AURA_MOD_ATTACKER_SPELL_HIT_CHANCE, schoolMask);
+    // Spells with SPELL_ATTR3_IGNORE_HIT_RESULT will ignore target's avoidance effects
-    // Reduce spell hit chance for Area of effect spells from victim SPELL_AURA_MOD_AOE_AVOIDANCE aura
+    if (!(spell->AttributesEx3 & SPELL_ATTR3_IGNORE_HIT_RESULT))
-    if (IsAreaOfEffectSpell(spell))
+    {
-        modHitChance -= pVictim->GetTotalAuraModifier(SPELL_AURA_MOD_AOE_AVOIDANCE);
+        // Chance hit from victim SPELL_AURA_MOD_ATTACKER_SPELL_HIT_CHANCE auras
+        modHitChance += pVictim->GetTotalAuraModifierByMiscMask(SPELL_AURA_MOD_ATTACKER_SPELL_HIT_CHANCE, schoolMask);
+        // Reduce spell hit chance for Area of effect spells from victim SPELL_AURA_MOD_AOE_AVOIDANCE aura
+        if (IsAreaOfEffectSpell(spell))
+            modHitChance -= pVictim->GetTotalAuraModifier(SPELL_AURA_MOD_AOE_AVOIDANCE);
+
+        // Decrease hit chance from victim rating bonus
+        if (pVictim->GetTypeId() == TYPEID_PLAYER)
+            modHitChance -= int32(pVictim->ToPlayer()->GetRatingBonusValue(CR_HIT_TAKEN_SPELL));
+    }
 
     int32 HitChance = modHitChance * 100;
     // Increase hit chance from attacker SPELL_AURA_MOD_SPELL_HIT_CHANCE and attacker ratings
     HitChance += int32(m_modSpellHitChance * 100.0f);
 
-    // Decrease hit chance from victim rating bonus
-    if (pVictim->GetTypeId() == TYPEID_PLAYER)
-        HitChance -= int32(pVictim->ToPlayer()->GetRatingBonusValue(CR_HIT_TAKEN_SPELL) * 100.0f);
-
     if (HitChance < 100)
         HitChance = 100;
     else if (HitChance > 10000)
@@ -2516,6 +2527,11 @@ SpellMissInfo Unit::MagicSpellHitResult(Unit *pVictim, SpellEntry const *spell)
     if (rand < tmp)
         return SPELL_MISS_MISS;
 
+    // Spells with SPELL_ATTR3_IGNORE_HIT_RESULT will additionally fully ignore
+    // resist and deflect chances
+    if (spell->AttributesEx3 & SPELL_ATTR3_IGNORE_HIT_RESULT)
+        return SPELL_MISS_NONE;
+
     // Chance resist mechanic (select max value from every mechanic spell effect)
     int32 resist_chance = pVictim->GetMechanicResistChance(spell) * 100;
     tmp += resist_chance;
@@ -3277,7 +3293,7 @@ void Unit::_UnapplyAura(AuraApplicationMap::iterator &i, AuraRemoveMode removeMo
     ASSERT(aurApp);
     ASSERT(!aurApp->GetRemoveMode());
     ASSERT(aurApp->GetTarget() == this);
-  
+
     aurApp->SetRemoveMode(removeMode);
     Aura * aura = aurApp->GetBase();
     sLog->outDebug(LOG_FILTER_SPELLS_AURAS, "Aura %u now is remove mode %d", aura->GetId(), removeMode);
@@ -3576,7 +3592,7 @@ void Unit::RemoveAura(AuraApplication * aurApp, AuraRemoveMode mode)
 {
     // we've special situation here, RemoveAura called while during aura removal
     // this kind of call is needed only when aura effect removal handler
-    // or event triggered by it expects to remove 
+    // or event triggered by it expects to remove
     // not yet removed effects of an aura
     if (aurApp->GetRemoveMode())
     {

src/server/game/Miscellaneous/SharedDefines.h

@@ -389,7 +389,7 @@ enum SpellAttr3
     SPELL_ATTR3_UNK15                            = 0x00008000, // 15 Auto Shoot, Shoot, Throw,  - this is autoshot flag
     SPELL_ATTR3_UNK16                            = 0x00010000, // 16 no triggers effects that trigger on casting a spell?? (15290 - 2.2ptr change)
     SPELL_ATTR3_NO_INITIAL_AGGRO                 = 0x00020000, // 17 Soothe Animal, 39758, Mind Soothe
-    SPELL_ATTR3_UNK18                            = 0x00040000, // 18 added to Explosive Trap Effect 3.3.0, removed from Mutilate 3.3.0
+    SPELL_ATTR3_IGNORE_HIT_RESULT                = 0x00040000, // 18 Spell should always hit its target
     SPELL_ATTR3_DISABLE_PROC                     = 0x00080000, // 19 during aura proc no spells can trigger (20178, 20375)
     SPELL_ATTR3_DEATH_PERSISTENT                 = 0x00100000, // 20 Death persistent spells
     SPELL_ATTR3_UNK21                            = 0x00200000, // 21