War of the Fallen

Being the angel of death rarely has its perks. Rhia was forced from heaven to spend the rest of her immortal life watching those she cares for die until, one day, her brother and best friend fell to earth—for her more specifically—to help free earth from the grasp of the demon king, Asmodeus, an evil, powerful demon whose agenda is clouded with Rhia's fear. All she knew was that he needed her to complete his ritual so that he may throw the earth and heaven into an apocalypse.