Ebyrith

Ebyrith are a transplanar race of demons who once served as the servants of the Revari in the days of old. Following the destruction of the Revari Dominion, the ebyrith were thought to be completley incapable of returning to the material plane. Ebyrith now dwell in the Plane of Arcana, feeding on and possessing arcane spellcasters. Arcanists who become possessed by an ebyrith are transformed into monstrous forms of themselves.