Casimir
Former Archfiend and Oblivion's mentor
Casimir is a former mortal who became an Archfiend and a hoarder of knowledge, yet hoped teaching could help break the cycle that destroys fallen Archfiends. He turned the self-aware Darkness Elemental Oblivion into his apprentice, granting free will and the power to replace him. Oblivion remains uncertain how much affection lay behind his mentor’s curiosity. Having betrayed his own teacher, Casimir took pride in Oblivion’s betrayal and warned him to remember what the Fiend God would do after his fall.
His desire to teach may persist in a Hushed remnant on Oblivion’s robes. His own freedom remains uncertain. Adimonde reconstructed him and compelled him to fight the Nation, but a temporary glimpse of his future potential renewed his hope of one day escaping that control.