Zorrus, The Plaguebringer is a unique Winged Assassin in Act V of Diablo III. He is found in the Pandemonium Fortress Level 2, usually in the main area rather than the isolated sections leading to Level 3.
In combat, he has Wormhole, Plagued and Poison Enchanted traits.
A bounty may be offered to kill Zorrus, in which case the secondary objective is to kill 100 enemies.