Scripts/TotT: Commander Ulthok's Dark Fissures will no longer despawn on heroic difficulty

src/server/game/Spells/SpellMgr.cpp

@@ -4476,14 +4476,17 @@ void SpellMgr::LoadSpellInfoCorrections()
 
     // Commander Ulthok
     // Dark Fissure
-    ApplySpellFix({
-        76047,
-        96311
-    }, [](SpellInfo* spellInfo)
+    ApplySpellFix({ 76047 }, [](SpellInfo* spellInfo)
     {
         spellInfo->Effects[EFFECT_0].RadiusEntry = sSpellRadiusStore.LookupEntry(EFFECT_RADIUS_1_YARD);
     });
 
+    ApplySpellFix({ 96311 }, [](SpellInfo* spellInfo)
+    {
+        spellInfo->DurationEntry = sSpellDurationStore.LookupEntry(21); // Infinite
+        spellInfo->Effects[EFFECT_0].RadiusEntry = sSpellRadiusStore.LookupEntry(EFFECT_RADIUS_1_YARD);
+    });
+
     // Ozumat
     // Purify
     ApplySpellFix({ 76953 }, [](SpellInfo* spellInfo)