Blooddrenched Mask

The Blooddrenched Mask is a very nice head slot item for Rogues and Feral Druids. Hunters may also be drawn to the agility and to-hit bonus, despite it being leather armor.

Source
Blooddrenched Mask drops off any of the aspects of Hakkar (High Priestess Jeklik, High Priest Venoxis, High Priestess Mar'li, High Priest Thekal, High Priestess Arlokk) in Zul'Gurub with an estimated droprate of 6.5%.