Acek Orattim

 was a priest of the Chained Oblivion during the Age of Arcanum. As an NPC, is played by Matthew Mercer.

Background
Acek made the Gatshadow Mountain into the Chained Oblivion's seat of power. From there, he spread his evil power until the Chained Oblivion's defeat by The Dawnfather. The Chained Oblivion retreated to the mountain to rally but was chased by The Dawnfather and banished. Acek's mind was so full of his master's essence that upon Tharizdun's banishment the priest's body was torn asunder.