Serpentor, Dream Weaver, is a Unique Barbed Lurker found in the Realm of Fractured Fate: Battlefields of Eternity in Act IV of Diablo III. He can be nominated a bounty.
In combat, he has the Orbiter and Wormhole affixes.
A bounty may be offered to kill Serpentor, in which case the secondary objective is to kill 100 enemies.