Empyrean Demolisher

Empyrean Demolisher is an main hand mace that is no longer obtainable in the game.

Source
This item dropped from Lord Kazzak in the Blasted Lands, prior to Patch 2.0.3, and then, during the Dark Portal Opens event, from Highlord Kruul (who had the same loot table). Now, however, it is unobtainable.