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 here he spread his evil power. This continued 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 his banishment priest's body was tore asunder.