diff --git a/src/server/scripts/EasternKingdoms/MagistersTerrace/boss_vexallus.cpp b/src/server/scripts/EasternKingdoms/MagistersTerrace/boss_vexallus.cpp
index 9855abce9..3fce92845 100644
--- a/src/server/scripts/EasternKingdoms/MagistersTerrace/boss_vexallus.cpp
+++ b/src/server/scripts/EasternKingdoms/MagistersTerrace/boss_vexallus.cpp
@@ -48,37 +48,36 @@ enum Spells
 
 enum Misc
 {
-    NPC_PURE_ENERGY                 = 24745,
-
-    INTERVAL_MODIFIER               = 15,
-    INTERVAL_SWITCH                 = 6,
-
-    EVENT_SPELL_CHAIN_LIGHTNING     = 1,
-    EVENT_SPELL_ARCANE_SHOCK        = 2,
-    EVENT_HEALTH_CHECK              = 3,
+    NPC_PURE_ENERGY                 = 24745
 };
 
-struct boss_vexallus : public ScriptedAI
+struct boss_vexallus : public BossAI
 {
-    boss_vexallus(Creature* creature) : ScriptedAI(creature), summons(me)
-    {
-        instance = creature->GetInstanceScript();
-    }
-
-    InstanceScript* instance;
-    EventMap events;
-    SummonList summons;
-
-    uint8 IntervalHealthAmount;
-    bool Enraged;
+    boss_vexallus(Creature* creature) : BossAI(creature, DATA_VEXALLUS) { }
 
     void Reset() override
     {
-        summons.DespawnAll();
-        IntervalHealthAmount = 1;
+        _Reset();
 
-        instance->SetBossState(DATA_VEXALLUS, NOT_STARTED);
-        instance->DoRemoveAurasDueToSpellOnPlayers(SPELL_ENERGY_FEEDBACK);
+        ScheduleHealthCheckEvent({ 85, 70, 55, 40 }, [&]
+        {
+            Talk(SAY_ENERGY);
+            Talk(EMOTE_DISCHARGE_ENERGY);
+
+            if (IsHeroic())
+            {
+                DoCastSelf(SPELL_SUMMON_PURE_ENERGY_H1);
+                DoCastSelf(SPELL_SUMMON_PURE_ENERGY_H2);
+            }
+            else
+                DoCastSelf(SPELL_SUMMON_PURE_ENERGY_N);
+        });
+
+        ScheduleHealthCheckEvent(20, [&]
+        {
+            scheduler.CancelAll();
+            DoCastSelf(SPELL_OVERLOAD, true);
+        });
     }
 
     void KilledUnit(Unit* victim) override
@@ -87,21 +86,20 @@ struct boss_vexallus : public ScriptedAI
             Talk(SAY_KILL);
     }
 
-    void JustDied(Unit* /*killer*/) override
-    {
-        summons.DespawnAll();
-        instance->SetBossState(DATA_VEXALLUS, DONE);
-        instance->DoRemoveAurasDueToSpellOnPlayers(SPELL_ENERGY_FEEDBACK);
-    }
-
     void JustEngagedWith(Unit* /*who*/) override
     {
+        _JustEngagedWith();
         Talk(SAY_AGGRO);
-        instance->SetBossState(DATA_VEXALLUS, IN_PROGRESS);
 
-        events.ScheduleEvent(EVENT_SPELL_CHAIN_LIGHTNING, 8000);
-        events.ScheduleEvent(EVENT_SPELL_ARCANE_SHOCK, 5000);
-        events.ScheduleEvent(EVENT_HEALTH_CHECK, 1000);
+        ScheduleTimedEvent(8s, [&]
+        {
+            DoCastRandomTarget(DUNGEON_MODE(SPELL_CHAIN_LIGHTNING_N, SPELL_CHAIN_LIGHTNING_H));
+        }, 8s, 8s);
+
+        ScheduleTimedEvent(5s, [&]
+        {
+            DoCastRandomTarget(DUNGEON_MODE(SPELL_ARCANE_SHOCK_N, SPELL_ARCANE_SHOCK_H));
+        }, 8s, 8s);
     }
 
     void JustSummoned(Creature* summon) override
@@ -121,56 +119,6 @@ struct boss_vexallus : public ScriptedAI
         if (killer)
             killer->CastSpell(killer, SPELL_ENERGY_FEEDBACK, true, 0, 0, summon->GetGUID());
     }
-
-    void UpdateAI(uint32 diff) override
-    {
-        if (!UpdateVictim())
-            return;
-
-        events.Update(diff);
-        if (me->HasUnitState(UNIT_STATE_CASTING))
-            return;
-
-        switch (events.ExecuteEvent())
-        {
-        case EVENT_HEALTH_CHECK:
-            //used for check, when Vexallus cast adds 85%, 70%, 55%, 40%
-            if (!HealthAbovePct(100 - INTERVAL_MODIFIER * IntervalHealthAmount))
-            {
-                if (IntervalHealthAmount++ == INTERVAL_SWITCH)
-                {
-                    events.Reset();
-                    me->CastSpell(me, SPELL_OVERLOAD, true);
-                    return;
-                }
-
-                Talk(SAY_ENERGY);
-                Talk(EMOTE_DISCHARGE_ENERGY);
-
-                if (IsHeroic())
-                {
-                    me->CastSpell(me, SPELL_SUMMON_PURE_ENERGY_H1, false);
-                    me->CastSpell(me, SPELL_SUMMON_PURE_ENERGY_H2, false);
-                }
-                else
-                    me->CastSpell(me, SPELL_SUMMON_PURE_ENERGY_N, false);
-            }
-            events.ScheduleEvent(EVENT_HEALTH_CHECK, 0);
-            break;
-        case EVENT_SPELL_CHAIN_LIGHTNING:
-            if (Unit* target = SelectTarget(SelectTargetMethod::Random, 0))
-                me->CastSpell(target, DUNGEON_MODE(SPELL_CHAIN_LIGHTNING_N, SPELL_CHAIN_LIGHTNING_H), false);
-            events.ScheduleEvent(EVENT_SPELL_CHAIN_LIGHTNING, 8000);
-            break;
-        case EVENT_SPELL_ARCANE_SHOCK:
-            if (Unit* target = SelectTarget(SelectTargetMethod::Random, 0, 20.0f))
-                me->CastSpell(target, DUNGEON_MODE(SPELL_ARCANE_SHOCK_N, SPELL_ARCANE_SHOCK_H), false);
-            events.ScheduleEvent(EVENT_SPELL_ARCANE_SHOCK, 8000);
-            break;
-        }
-
-        DoMeleeAttackIfReady();
-    }
 };
 
 void AddSC_boss_vexallus()