Disembodied means having no material body, being immaterial incorporeal or insubstantial. Hereditaments are divided into corporeal and incorporeal. The undead may be incorporeal (ghosts) or corporeal (mummies, vampires and zombies). God is most often held to be incorporeal (immaterial). The property may be moveable, immovable or incorporeal. The Stoics rejected the idea that incorporeal beings inhere in matter, as taught by Plato. Incorporeal property, whether movable or immovable, may also be attached. In Brahma Kumaris, human souls are believed to be incorporeal and eternal. As a ghost, Anya is incorporeal and invisible to everyone except Xander. He considered this essence to be an incorporeal, eternal occupant of our being. Thus, each phase represents a degradation from the original state of incorporeal holiness. According to Thomas the soul is not matter, not even incorporeal or spiritual matter. In such cases the title is known as an "incorporeal hereditament". As the Dark God, he is described as an incorporeal wraithform, black and faceless. Such an incorporeal, active substance is called a Spirit.