Oblivion
A Former Archfiend in Nulgath’s Service
Oblivion is a former Darkness Elemental whose life as a Fiend is bound to the cycle of masters betraying and replacing one another. Casimir granted him free will and made him an apprentice, only for Oblivion to betray him and become Archfiend while Adimonde consumed his mentor. His own despair left him vulnerable to Nulgath, who sealed his mind through a contract and kept him as a servant.
His view of Nulgath remains more generous than that treatment might suggest. With his memories restored, he confronts Nulgath and strikes at Adimonde, yet also regards Nulgath as his liberator. He offers inherited knowledge of earlier Archfiends in the hope that his master will rule the Fiend’s Void. That allegiance does not prevent him from understanding the Hero’s damaged trust in Nulgath.
Sources
AQW Wiki: Oblivion · AQW Wiki: Jadzia · Oblivion’s contract · The Archfiends confront Adimonde