fix(Scripts/SunwellPlateau): Dark Fiends should use threat table and not deal melee damage (#21991)

src/server/scripts/EasternKingdoms/SunwellPlateau/boss_muru.cpp

@@ -209,7 +209,54 @@ struct npc_dark_fiend : public ScriptedAI
 
         me->m_Events.AddEventAtOffset([this]() {
             me->SetReactState(REACT_AGGRESSIVE);
-            if (Unit* target = SelectTargetFromPlayerList(200.0f, 0, true))
+            Unit* target = nullptr;
+            if (InstanceScript* instance = me->GetInstanceScript())
+            {
+                if (Creature* muru = instance->GetCreature(DATA_MURU))
+                {
+                    if (muru->IsAlive() && !muru->HasUnitFlag(UNIT_FLAG_NOT_SELECTABLE))
+                    {
+                        std::list<HostileReference*> const& threatList = muru->GetThreatMgr().GetThreatList();
+                        std::vector<Unit*> validTargets;
+
+                        for (HostileReference* ref : threatList)
+                        {
+                            if (Unit* unit = ObjectAccessor::GetUnit(*muru, ref->getUnitGuid()))
+                            {
+                                if (unit->IsPlayer() && unit->IsAlive() && unit->IsWithinDist(me, 50.0f))
+                                    validTargets.push_back(unit);
+                            }
+                        }
+
+                        if (!validTargets.empty())
+                            target = validTargets[urand(0, validTargets.size() - 1)];
+                    }
+                    else
+                    {
+                        if (Creature* entropius = me->FindNearestCreature(NPC_ENTROPIUS, 100.0f))
+                        {
+                            std::list<HostileReference*> const& threatList = entropius->GetThreatMgr().GetThreatList();
+                            std::vector<Unit*> validTargets;
+
+                            for (HostileReference* ref : threatList)
+                            {
+                                if (Unit* unit = ObjectAccessor::GetUnit(*entropius, ref->getUnitGuid()))
+                                {
+                                    if (unit->IsPlayer() && unit->IsAlive() && unit->IsWithinDist(me, 50.0f))
+                                    {
+                                        validTargets.push_back(unit);
+                                    }
+                                }
+                            }
+
+                            if (!validTargets.empty())
+                                target = validTargets[urand(0, validTargets.size() - 1)];
+                        }
+                    }
+                }
+            }
+
+            if (target)
             {
                 AttackStart(target);
                 me->AddThreat(target, 100000.0f);
@@ -255,8 +302,6 @@ struct npc_dark_fiend : public ScriptedAI
                 me->DespawnOrUnsummon();
             }, 1s);
         }
-
-        DoMeleeAttackIfReady();
     }
 
 private: