Ithil the Forsaken

The fey spirit of the moon turned into a devil after being cast out by his brother, Anor the Bright. Anor condemned Ithil for sleeping with a mortal woman, Vanurra the Beautiful, first of the Moon Elves. They argued and fought, and Anor proved victorious, casting Ithil out of the Feywilds. He went to the hells for refuge, becoming a devil and cursing his lineage to become tieflings.

Ithil is worshiped as the patron of the Moon Elves and as the moon. As such, the Moon Elves hate the Sun Elves, who worship Anor. They also worship, to some extent, the tieflings born of Ithil's blood. It is said that a child of the moon will unite and guide the Moon Elves into a golden age. The prophecy goes as follows"

"Nostnu il-dolen ithil, kainenranda ale'lanta, dun-Tuupanar deno'vanya-Asem. Dethol-ron ed'hyanda-ontaro ar'cor-talant'hini e'a arvandor. Au'rien-Ithil alkar ar'nuut-anor."

Which translates to

"Born under unhidden moon, a millennia after the Fall, the Eclipse will rise upon fair Asem. They will be chosen by the blade of their ancestors and will guide the cursed children into salvation. The moon will be restored to its glory and the sun will fall from the sky."