You utter a primordial imprecation that brings woe upon your enemies. A target suffers an effect based on its current hit points.
Additionally, when a celestial, elemental, fey, or fiend is affected by this spell it is immediately forced back to its home plane and for 24 hours it is unable to return to your current plane by any means less powerful than a wish spell. Such a creature does not suffer this effect if it is already on its plane of origin.