diff --git a/data/sql/updates/pending_db_world/rev_1654407708502994800.sql b/data/sql/updates/pending_db_world/rev_1654407708502994800.sql
new file mode 100644
index 000000000..cf1bf636a
--- /dev/null
+++ b/data/sql/updates/pending_db_world/rev_1654407708502994800.sql
@@ -0,0 +1,2 @@
+--
+UPDATE `creature_template` SET `flags_extra`=`flags_extra`|256 WHERE `entry`=15082;
diff --git a/src/server/scripts/EasternKingdoms/ZulGurub/boss_grilek.cpp b/src/server/scripts/EasternKingdoms/ZulGurub/boss_grilek.cpp
index 74be364eb..0c7fef454 100644
--- a/src/server/scripts/EasternKingdoms/ZulGurub/boss_grilek.cpp
+++ b/src/server/scripts/EasternKingdoms/ZulGurub/boss_grilek.cpp
@@ -29,13 +29,16 @@ EndScriptData */
 enum Spells
 {
     SPELL_AVATAR                    = 24646, // Enrage Spell
-    SPELL_GROUND_TREMOR             = 6524
+    SPELL_GROUND_TREMOR             = 6524,
+    SPELL_ENTANGLING_ROOTS          = 24648
 };
 
 enum Events
 {
     EVENT_AVATAR                    = 1,
-    EVENT_GROUND_TREMOR             = 2
+    EVENT_GROUND_TREMOR             = 2,
+    EVENT_START_PURSUIT             = 3,
+    EVENT_ENTANGLING_ROOTS          = 4
 };
 
 class boss_grilek : public CreatureScript // grilek
@@ -45,23 +48,16 @@ public:
 
     struct boss_grilekAI : public BossAI
     {
-        boss_grilekAI(Creature* creature) : BossAI(creature, DATA_EDGE_OF_MADNESS) { }
-
-        void Reset() override
+        boss_grilekAI(Creature* creature) : BossAI(creature, DATA_EDGE_OF_MADNESS)
         {
-            _Reset();
-        }
-
-        void JustDied(Unit* /*killer*/) override
-        {
-            _JustDied();
         }
 
         void EnterCombat(Unit* /*who*/) override
         {
             _EnterCombat();
-            events.ScheduleEvent(EVENT_AVATAR, urand(15000, 25000));
-            events.ScheduleEvent(EVENT_GROUND_TREMOR, urand(15000, 25000));
+            events.ScheduleEvent(EVENT_AVATAR, 20s, 30s);
+            events.ScheduleEvent(EVENT_GROUND_TREMOR, 15s, 25s);
+            events.ScheduleEvent(EVENT_ENTANGLING_ROOTS, 5s, 15s);
         }
 
         void UpdateAI(uint32 diff) override
@@ -80,19 +76,21 @@ public:
                 {
                     case EVENT_AVATAR:
                         DoCast(me, SPELL_AVATAR);
-                        if (Unit* victim = me->GetVictim())
-                        {
-                            if (DoGetThreat(victim))
-                                DoModifyThreatPercent(victim, -50);
-                        }
-
-                        if (Unit* target = SelectTarget(SelectTargetMethod::Random, 1))
-                            AttackStart(target);
-                        events.ScheduleEvent(EVENT_AVATAR, urand(25000, 35000));
+                        DoResetThreat();
+                        me->SetReactState(REACT_PASSIVE);
+                        events.ScheduleEvent(EVENT_START_PURSUIT, 2s);
+                        events.ScheduleEvent(EVENT_AVATAR, 45s, 50s);
                         break;
                     case EVENT_GROUND_TREMOR:
                         DoCastVictim(SPELL_GROUND_TREMOR, true);
-                        events.ScheduleEvent(EVENT_GROUND_TREMOR, urand(12000, 16000));
+                        events.ScheduleEvent(EVENT_GROUND_TREMOR, 12s, 16s);
+                        break;
+                    case EVENT_START_PURSUIT:
+                        me->SetReactState(REACT_AGGRESSIVE);
+                        break;
+                    case EVENT_ENTANGLING_ROOTS:
+                        DoCastVictim(SPELL_ENTANGLING_ROOTS);
+                        events.ScheduleEvent(EVENT_ENTANGLING_ROOTS, 10s, 20s);
                         break;
                     default:
                         break;