Mage Lord Misgen, Guardian Lord of Blood is a super unique Smoldering Construct that can be found in Vault of the Assassin in Diablo III. In Campaign Mode, he spawns immediately after player touches the Blood of Zoltun Kulle, but killing him is not required for the quest.
In combat, he uses Reflects Damage and Missile Dampening affixes.
A bounty may be offered to kill Mage Lord Misgen, in which case the secondary objective is to kill 100 enemies.