Death's Bite

Source
This item drops from Kel'Thuzad in the 10-man version of Naxxramas.

Trivia

 * Death's Bite appears as a common weapon for the Warrior class in the Curse of Naxxramas adventure of Hearthstone. The flavor text reads: ""Take a bite outta Death." - McScruff the Deathlord"
 * The Hearthstone card artwork actually depicts Troggbane, Axe of the Frostborne King.