During his adult life, his parents died of unknown causes, bequeathing a large fortune to Calixto and his sister. Traveling Tamriel, they collected several rare items, such as the Book of Fate. Shortly after settling in Windhelm, his sister Lucilla died, and he opened a curiosity shop in her name, to display their collection. Secretly, the grief of losing his sister was too much for him to bear, and Calixto began to lead a secret life of necromancy in hopes of resurrecting Lucilla, which involved the murders of several young women in Windhelm.