diff --git a/data/sql/updates/pending_db_world/rev_1679478116786061100.sql b/data/sql/updates/pending_db_world/rev_1679478116786061100.sql
new file mode 100644
index 000000000..7c2357f3a
--- /dev/null
+++ b/data/sql/updates/pending_db_world/rev_1679478116786061100.sql
@@ -0,0 +1,4 @@
+--
+UPDATE `creature_text` SET `Emote` = 33 WHERE `CreatureID` = 19220 AND `GroupID` = 6;
+UPDATE `smart_scripts` SET `action_param1` = 1 WHERE `id`=1003 AND `action_type` = 223 AND `entryorguid` IN (-138820, -138869, -138893, -138879);
+UPDATE `creature_template_addon` SET `emote` = 0 WHERE (`entry` = 19220);
diff --git a/src/server/scripts/Outland/TempestKeep/Mechanar/boss_pathaleon_the_calculator.cpp b/src/server/scripts/Outland/TempestKeep/Mechanar/boss_pathaleon_the_calculator.cpp
index 66ed5c78b..209aaae4b 100644
--- a/src/server/scripts/Outland/TempestKeep/Mechanar/boss_pathaleon_the_calculator.cpp
+++ b/src/server/scripts/Outland/TempestKeep/Mechanar/boss_pathaleon_the_calculator.cpp
@@ -37,12 +37,19 @@ enum Spells
     SPELL_ARCANE_TORRENT            = 36022,
     SPELL_MANA_TAP                  = 36021,
     SPELL_DOMINATION                = 35280,
+    SPELL_ETHEREAL_TELEPORT         = 34427,
+    SPELL_GREATER_INVISIBILITY      = 34426,
     SPELL_SUMMON_NETHER_WRAITH_1    = 35285,
     SPELL_SUMMON_NETHER_WRAITH_2    = 35286,
     SPELL_SUMMON_NETHER_WRAITH_3    = 35287,
     SPELL_SUMMON_NETHER_WRAITH_4    = 35288,
 };
 
+enum Misc
+{
+    ACTION_BRIDGE_MOB_DEATH = 1, // Used by SAI
+};
+
 struct boss_pathaleon_the_calculator : public BossAI
 {
     boss_pathaleon_the_calculator(Creature* creature) : BossAI(creature, DATA_PATHALEON_THE_CALCULATOR)
@@ -53,6 +60,21 @@ struct boss_pathaleon_the_calculator : public BossAI
         });
     }
 
+    void Reset() override
+    {
+        _Reset();
+
+        if (instance->GetPersistentData(DATA_BRIDGE_MOB_DEATH_COUNT) < 4)
+        {
+            DoCastSelf(SPELL_GREATER_INVISIBILITY);
+        }
+    }
+
+    bool CanAIAttack(Unit const* /*target*/) const override
+    {
+        return instance->GetPersistentData(DATA_BRIDGE_MOB_DEATH_COUNT) >= 4;
+    }
+
     void JustEngagedWith(Unit* /*who*/) override
     {
         _JustEngagedWith();
@@ -86,18 +108,48 @@ struct boss_pathaleon_the_calculator : public BossAI
             context.Repeat(15s);
         }).Schedule(25s, [this](TaskContext context)
         {
-            Talk(SAY_DOMINATION);
-            DoCastRandomTarget(SPELL_DOMINATION, 1, 50.0f);
+            if (DoCastRandomTarget(SPELL_DOMINATION, 1, 50.0f) == SPELL_CAST_OK)
+            {
+                Talk(SAY_DOMINATION);
+            }
             context.Repeat(30s);
-        }).Schedule(8s, [this](TaskContext context)
-        {
-            DoCastAOE(SPELL_ARCANE_EXPLOSION);
-            context.Repeat(12s);
         });
 
+        if (IsHeroic())
+        {
+            scheduler.Schedule(8s, [this](TaskContext context)
+            {
+                DoCastAOE(SPELL_ARCANE_EXPLOSION);
+                context.Repeat(12s);
+            });
+        }
+
         Talk(SAY_AGGRO);
     }
 
+    void DoAction(int32 actionId) override
+    {
+        if (actionId == ACTION_BRIDGE_MOB_DEATH)
+        {
+            uint8 mobCount = instance->GetPersistentData(DATA_BRIDGE_MOB_DEATH_COUNT);
+            instance->StorePersistentData(DATA_BRIDGE_MOB_DEATH_COUNT, ++mobCount);
+
+            if (mobCount >= 4)
+            {
+                DoCastSelf(SPELL_ETHEREAL_TELEPORT);
+                Talk(SAY_APPEAR);
+
+                scheduler.Schedule(2s, [this](TaskContext)
+                {
+                    me->SetUInt32Value(UNIT_NPC_EMOTESTATE, EMOTE_STATE_READY1H);
+                }).Schedule(25s, [this](TaskContext)
+                {
+                    DoZoneInCombat();
+                });
+            }
+        }
+    }
+
     void KilledUnit(Unit* victim) override
     {
         if (victim->IsPlayer())
diff --git a/src/server/scripts/Outland/TempestKeep/Mechanar/mechanar.h b/src/server/scripts/Outland/TempestKeep/Mechanar/mechanar.h
index e41928705..4f3f8567b 100644
--- a/src/server/scripts/Outland/TempestKeep/Mechanar/mechanar.h
+++ b/src/server/scripts/Outland/TempestKeep/Mechanar/mechanar.h
@@ -63,6 +63,7 @@ enum SpellIds
 
 enum DataIndex
 {
+    DATA_BRIDGE_MOB_DEATH_COUNT,
     MAX_DATA_INDEXES
 };