Zhar'doom, Greatstaff of the Devourer

Zhar'doom, Greatstaff of the Devourer is an epic staff for casters.

Source
This item drops from Illidan Stormrage in the Black Temple.

Trivia

 * The name may be a reference to StarCraft, considering that in some levels and the map editor you were able to add a zergling hero called "Devouring One", and the Felhunters that this staff is modeled after bear a passing resemblance to zerglings.
 * The name "Zhar'doom" may be a reference to Z'ha'dum, the homeworld of the Shadows in the science fiction series .
 * In the TCG, a felhound called Zhar'doom appears. Its flavor text simply reads "The Devourer", implying that it is what the staff is named after.