Dark Alliance - (HPMerlin Cross-over)

Morgana Pendragon, the most powerful dark witch that ever lived and the last high priestess of the old religion, is reincarnated as Morgan Potter, the girl-who-lived. She doesn't have a throne to conquer anymore but that won't stop her from having the Wizarding World bow before her. AU. Voldemort/FemHarry(Morgana). Neville is also the boy-who-lived but FemHarry is a horcrux.