Agatha has her dybbuk because Aaronev Wilhelm Sturmvoraus attempted to use the mysterious Mind Transfer Machine on her. The intention was to erase Agatha's personality and mind while replacing it with a copy of Lucrezia Mongfish's mind and personality. This did not work out as planned by Lucrezia because one of her Priestesses, one Loremistress Milvistle, was disillusioned with her and sabotaged the machine causing it to malfunction during the copying process. Agatha's mind and personality were not erased, so Lucrezia's mind and personality were forced to occupy only part of Agatha's brain. Lucrezia's is the stronger personality, so she can suppress Agatha's personality until she put on Agatha's Locket. This locket was made by Barry Heterodyne to help hide Agatha's spark. Fortunately, it h