Betrayed by the Olympians, Percy is left to die, only to be resurrected by Rias Gremory as a combination of her Knight and Rook pieces. Percy now loyally serves her, rising up in the ranks of the Underworld so that he may gain his own peerage which he will use to enact vengeance upon those who betrayed him. Percy x Harem(not just in his peerage). No OCs.