"Vagrant Story" centers around the "Dark", a formless, invisible entity. In places where the Dark runs strongest, those who died will have their corpses controlled by the dark, becoming the undead. The Dark exists within a person as negative energy that unleashes the individual's latent power. Throughout the story, many individuals crave the powers of the Dark, which centers around the abandoned city of Leá Monde. Another mythological aspect of "Vagrant Story" is the Kiltia, an ancient cult which built itself upon the Dark and ancient sorcery, and of which the Müllenkamp sect is stemmed from. It can be seen that most rituals and summoning performed in the game involved ancient Kildean magic.