is a Unique Exarch
found in the Pandemonium Fortress
Level 1 in Act V
of Diablo III
He spawns for the Judgment event, and serves as its final boss. After releasing imprisoned demons, Alzarius decides to kill the Nephalem with his own hands.
In combat, he has the Jailer affix, and summons Shadow Vermin and Winged Assassins to aid him in battle.