Abeloos Casserly is a mage who originally lived in the underground city of Fnorro and helped out people.
Abeloos dreams of establishing a nation where the Kin of Dark Night may live in peace. However this dream, coupled with his infatuation with Celica, who had the body of a goddess and had a feminine appearance, eventually corrupts him and drives him crazy as he becomes obsessed with obtaining the body of the goddess. As a result of exerting too much power in his attempt to claim the body of the goddess, he loses his youthful appearance and much of his strength. However he lives on long enough to recover and grow stronger than ever, being able to go as far as to gain control of Naberius, the guardian of the Dark Road that leads to the netherworld, in order to lure Celica later on and subsequently has several more encounters with him across various chapters of the Battle Goddess series in his pursuit of more power.