fix(Scripts/AuchenaiCrypts): Fix Exarch Maladaar despawning the avata… (#16625)

src/server/scripts/Outland/Auchindoun/AuchenaiCrypts/boss_exarch_maladaar.cpp

@@ -74,7 +74,10 @@ struct boss_exarch_maladaar : public BossAI
         _Reset();
         ScheduleHealthCheckEvent(25, [&] {
             Talk(SAY_SUMMON);
-            DoCastSelf(SPELL_SUMMON_AVATAR);
+            scheduler.Schedule(100ms, [this](TaskContext)
+            {
+                DoCastSelf(SPELL_SUMMON_AVATAR);
+            });
         });
     }
 
@@ -133,6 +136,11 @@ struct boss_exarch_maladaar : public BossAI
         _JustDied();
     }
 
+    void JustSummoned(Creature* /*creature*/) override
+    {
+        // Override JustSummoned() so we don't despawn the Avatar.
+    }
+
     void UpdateAI(uint32 diff) override
     {
         if (!UpdateVictim())