Elin:Yaksha of Oblivion

Born the fourth daughter of Elin the White Widow, she was captured by the Witch of the Ravenwood when she was a child, and even the memory of her existence was erased from her mother. Imprisoned in a dark room in the Misty Tower, she was raised without knowledge of the outside world as a tool of vengeance for the witch who hated Elin. Even after killing daughters of Elin, she never realized that they were her sisters. Eventually the girl's awakening had brought fraying to Ylva.