Haxxor, Wielder of Giant Axes, is a Unique Phasebeast found in the Tower of the Damned Level 1 in Act III of Diablo III.
In combat, he has Desecrator and Vortex affixes.
He may appear as a bounty, in which case the side objective is to kill 40 enemies. He may appear fairly close to the waypoint, making it a fast bounty to clear.