Wirt's Other Leg


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Perhaps the overzealous adventurer pried this off before his journey here thinking it might give him one last opportunity at bovine slaughter. Little did he know where it would lead him.

Source
Illidan, Kael, Lady Vashj and Akama can find this in Lord of Outland, chapter 6 of the Frozen Throne alliance campaign, Curse of the Blood Elves. The item is guarded by an abomination named Butcher. The term, Wirt's Other Leg, refers to Diablo where a boss named, "The Butcher" severs off a leg of a boy named Wirt.