Ultear Milkovich is the daughter of Ul, a former powerful Ice Mage. However, she mistakenly believed that her mother had abandoned her, which led to deep-seated resentment and a desire for vengeance. This misunderstanding drove her to join a dark guild in pursuit of power. Ultear became one of the high-ranking members of Grimoire Heart and served as the leader of the Seven Kin of Purgatory, an elite group of powerful mages within the guild.