Harry Potter: Wrath of the Ascendant

Powerful and unnatural beings like Voldemort are not so rare in the magical world as many fool themselves into believing. With his disappearance a clandestine organization of immortals - of Voldemort's equals - set into motion their own dark ambitions. Each as terrible and great as anything Tom Riddle ever dreampt up.(Essentially Akatsuki of the Harry Potter universe. Enjoy.)