Melzar the Mad moved them to his maze at the command of a lesser demon which had taken up residence in his basement. The reason for their relocation is not known, though Melzar's notes, found while searching bookcases in Melzar's Maze, suggest that Melzar was attempting necromancy with the ghosts. As his experimentation progressed, he became insane, and all further necromancy work was abandoned in favour of cabbage-based magic.