Backstory:
Gri was born to a pair of other aasimar in a cult of them all worshipping Cyric believing him to be the god that gave them their holy powers in the first place. Gri believes this too, especially because of how similar her personality grew to be to theirs, unaware of the cult grooming involved to make him that way. They were raised to be a liar and a trickster and a thief, making money with and for the cult through thievery and manipulation. But he wasn't exactly the most obedient child, often acting out when she didn't get his way or was punished for something and pulling pranks on others often even when it caused trouble for him or others. Which quickly annoyed the cult, leading them decide to take... Drastic measures, to try and control them better.

They forced him to perform a ritual to contact what they believed to be a servant of Cyric but was actually something much much more incomprehensible. And plentiful. They tried to cut their contact with it/them when they found out it/they didn't exactly care about what they wanted and wasn't what they intended to contact but failed and so eventually they got frustrated enough to just kick him out entirely, which was exactly what the thing had been waiting for, taking the moment of betrayed emotional and scared abandoned Gri to manipulate him into a deal with it/them. She gave in and he regrets it to this day as it/they haunt him with instincts and demands and whispered desires against her will to entertain it/them and give it/them what it/they wants, which he's yet to be able to pinpoint what even is much to his utter hatred and terror.

She's been running from area to area ever since barely escaping the law or angry people he's wronged under it's/their demands or his own trouble making ways. They mostly makes money for survival with odd jobs or mercenary work since her deal did give him some good magic, but he's also open to theft still and is relatively self-sufficient in the right environments and circumstances too