fix(Scripts/Creature): multi-raid faction leader credit (#22168)

src/server/game/AI/ScriptedAI/ScriptedCreature.cpp

@@ -269,6 +269,16 @@ void ScriptedAI::DoStopAttack()
         me->AttackStop();
 }
 
+void ScriptedAI::DoRewardPlayersInArea()
+{
+    me->GetMap()->DoForAllPlayers([&](Player* player)
+    {
+        if (player->GetFaction() != me->GetCreatureTemplate()->faction && !player->IsGameMaster())
+            if (player->GetAreaId() == me->GetAreaId())
+                player->KilledMonsterCredit(me->GetEntry());
+    });
+}
+
 void ScriptedAI::DoCastSpell(Unit* target, SpellInfo const* spellInfo, bool triggered)
 {
     if (!target || me->IsNonMeleeSpellCast(false))

src/server/game/AI/ScriptedAI/ScriptedCreature.h

@@ -306,6 +306,9 @@ struct ScriptedAI : public CreatureAI
     //Stop attack of current victim
     void DoStopAttack();
 
+    //Reward kill credit to all players from the oposing faction in the area (faction leaders)
+    void DoRewardPlayersInArea();
+
     //Cast spell by spell info
     void DoCastSpell(Unit* target, SpellInfo const* spellInfo, bool triggered = false);