Corpse Explosion is a death knight ability granted via [Glyph of Corpse Explosion]. It is cosmetic only. It allows the death knight to cause a corpse to explode. Exploded corpses change to meat or bones models.
Patch changes
Patch 5.0.4 (28 August 2012): Updated, cosmetic only; changed from Cause a corpse to explode for X Shadow damage to all enemies within 20 yards. Will use a nearby corpse if the target is not a corpse. Does not affect mechanical or elemental corpses.
Patch 3.0.8 (2009-01-20): Damage increased substantially, added 5 second cooldown, and changed cost to 40 runic power. Fixed a bug where how much Runic Power the Death Knight had was affecting the damage done, and also increased the damage substantially.