Infernal Headcage

Infernal Headcage is an mail helmet appreciated by Shamans for its stats and resistances.

Source
Infernal Headcage 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.