Soulsmasher

Soulsmasher is a legendary two-handed mace in Diablo III. It requires character level 12 to drop, and can only be found in or  Horadric Caches.

Its most notable property is turning a player's Life per Kill to damage. However, it is hardly an efficient solution, especially on higher difficulties, as resulting damage does not increase from a player's Primary Core stat. Contrary to description, it does not possess any kind of the 'slain enemies rest in pieces' property: the corpses do not explode, just release a purple blast on death.

Death's Bargain is an item with similar mechanic, trading healing for damage.