In Ravencroft Manor, Seraphina stumbles upon her vanished grandmother's journal, revealing a terrifying truth: the monstrous Shadow Eater has consumed Morrigan and now its hunger eyes Seraphina. Armed with forbidden knowledge and steeled by grief, Seraphina becomes the Moonblade, vowing to fight through chilling trials and dark realms to banish the Shadow Eater before it devours reality itself.