Duchess Ysabell of Sto Helit was the adoptive daughter of Death, wife of Duke Mortimer and mother of Susan Sto Helit. Her birth parents were killed while she was a child, so Death took her to his domain and raised her as his own. The couple had a daughter named Susan Sto Helit, but Ysabell and her husband sadly died after the carriage they were in plunged into a ravine, killing them.