fix(Scripts/Ulduar): despawn Freya's Strengthened Iron Roots on wipe and defeat (#27286)

src/server/scripts/Northrend/Ulduar/Ulduar/boss_freya.cpp

@@ -996,6 +996,19 @@ struct boss_freya_iron_root : public NullCreatureAI
     boss_freya_iron_root(Creature* pCreature) : NullCreatureAI(pCreature) { }
 
     void JustDied(Unit* /*killer*/) override
+    {
+        ReleaseRootedPlayer();
+    }
+
+    // The root aura is infinite and self-cast by the victim, so nothing engine-side
+    // removes it; a root despawned without being killed must free its victim too
+    void OnDespawn() override
+    {
+        ReleaseRootedPlayer();
+    }
+
+private:
+    void ReleaseRootedPlayer()
     {
         if (!me->IsSummon())
             return;

src/server/scripts/Northrend/Ulduar/Ulduar/instance_ulduar.cpp

@@ -168,8 +168,9 @@ ObjectData const gameobjectData[] =
 
 ObjectData const summonData[] =
 {
-    { NPC_SARONITE_ANIMUS,  BOSS_VEZAX }, // summoned by a Saronite Vapor, not Vezax
-    { 0,                    0          }
+    { NPC_SARONITE_ANIMUS,          BOSS_VEZAX }, // summoned by a Saronite Vapor, not Vezax
+    { NPC_STRENGTHENED_IRON_ROOTS,  BOSS_FREYA }, // summoned by the rooted player, not Freya
+    { 0,                            0          }
 };
 
 BossBoundaryData const boundaries =

src/server/scripts/Northrend/Ulduar/Ulduar/ulduar.h

@@ -173,6 +173,7 @@ enum UlduarNPCs
     NPC_HODIR                               = 32845,
     NPC_THORIM                              = 32865,
     NPC_FREYA                               = 32906,
+    NPC_STRENGTHENED_IRON_ROOTS             = 33168,
     NPC_VEZAX                               = 33271,
     NPC_SARONITE_ANIMUS                     = 33524,
     NPC_SARA                                = 33134,