Core/Spells: remove some workarounds about transform spells in corpse explosion script.

src/server/game/Entities/Unit/Unit.cpp

@@ -12704,14 +12704,6 @@ void Unit::setDeathState(DeathState s)
     }
     else if (s == JUST_ALIVED)
         RemoveFlag (UNIT_FIELD_FLAGS, UNIT_FLAG_SKINNABLE); // clear skinnable for creature and player (at battleground)
-
-    if (oldDeathState != ALIVE && s == ALIVE)
-    {
-        // Reset display id on resurection - needed by corpse explosion to cleanup after display change
-        // TODO: fix this
-        if (!HasAuraType(SPELL_AURA_TRANSFORM))
-            SetDisplayId(GetNativeDisplayId());
-    }
 }
 
 /*########################################

src/server/scripts/Spells/spell_dk.cpp

@@ -29,8 +29,8 @@ enum DeathKnightSpells
     DK_SPELL_RUNIC_POWER_ENERGIZE               = 49088,
     DK_SPELL_ANTI_MAGIC_SHELL_TALENT            = 51052,
     DK_SPELL_CORPSE_EXPLOSION_TRIGGERED         = 43999,
+    DK_SPELL_CORPSE_EXPLOSION_VISUAL            = 51270,
     DK_SPELL_GHOUL_EXPLODE                      = 47496,
-    DISPLAY_GHOUL_CORPSE                        = 25537,
     DK_SPELL_SCOURGE_STRIKE_TRIGGERED           = 70890,
     DK_SPELL_BLOOD_BOIL_TRIGGERED               = 65658,
     DK_SPELL_WILL_OF_THE_NECROPOLIS_TALENT_R1   = 49189,
@@ -208,6 +208,8 @@ class spell_dk_corpse_explosion : public SpellScriptLoader
                     return false;
                 if (!sSpellMgr->GetSpellInfo(DK_SPELL_GHOUL_EXPLODE))
                     return false;
+                if (!sSpellMgr->GetSpellInfo(DK_SPELL_CORPSE_EXPLOSION_VISUAL))
+                    return false;
                 return true;
             }
 
@@ -227,9 +229,9 @@ class spell_dk_corpse_explosion : public SpellScriptLoader
                         GetCaster()->CastCustomSpell(unitTarget, GetSpellInfo()->Effects[EFFECT_1].CalcValue(), &bp, NULL, NULL, true);
                         // Corpse Explosion (Suicide)
                         unitTarget->CastSpell(unitTarget, DK_SPELL_CORPSE_EXPLOSION_TRIGGERED, true);
-                        // Set corpse look
-                        unitTarget->SetDisplayId(DISPLAY_GHOUL_CORPSE + urand(0, 3));
                     }
+                    // Set corpse look
+                    GetCaster()->CastSpell(unitTarget, DK_SPELL_CORPSE_EXPLOSION_VISUAL, true);
                 }
             }
 
@@ -261,8 +263,6 @@ class spell_dk_ghoul_explode : public SpellScriptLoader
                 {
                     // Corpse Explosion (Suicide)
                     unitTarget->CastSpell(unitTarget, DK_SPELL_CORPSE_EXPLOSION_TRIGGERED, true);
-                    // Set corpse look
-                    unitTarget->SetDisplayId(DISPLAY_GHOUL_CORPSE + urand(0, 3));
                 }
             }