Cristine was an illusion of a woman who lived on Madea Island, created by the Titan Madea. She claimed that her family's responsibility was to guard the Casterwill family legacy and bring Sophie Casterwill to the island's Casterwill Library. After Sophie studied the books in the library, she discovered that they were vague and contradict each other. Realizing that Cristine and the library were merely illusions, Sophie cast Breakspell on Cristine, causing her to vanish. S1E11