Fenriyar, a Fey being of god-like power is currently the embodiment of Chaos. Prior to them being Fenriyar, they were a Devil Lord of the 9 Hells, ruling over the Sixth Layer of Hell, Rigidum Khaotica.

Before the "collapse of the Obsidian Ring," he [at the time identifying as male] had more freedom but then ended up in charge of this unmoving, static layer of Hell. Eventually, he swindled the Moonlit King.

Fenriyar was essentially able to pass his devilish nature to the Moonlit King, trapping him in the Tower of the Moon, making it the defacto Tenth Layer of Hell. In doing so, Fenriyar was able to erase their original name from history, stealing the name of someone else, and becoming the fey god we all know and love.

At some point the Everqueens, with the help of Jorun, trapped Fenriyar in a demiplane, siphoning their power to keep the Everqueens immortal. This all seemed to happen around the time of the Ascenion of Etheria and establishment of their queendom.

Since then, Fenriyar has been freed with the help of my friends and has become…an associate would be the best term. While they are specifically friendly to one friend of mine, I would not make the mistake of calling Fenriyar a “friend.”