Planescape Canonical Campaign
The Planes of Existence
The many planes of existence are divided into several major categories. The Prime Material Plane is the mortal realm so many are born, live, and die on without realizing the full expanse of the multiverse. But the matter of the Prime Material and the beliefs of its inhabitants are what feed the other planes. The Outer Planes are composed of belief itself rather than ordinary matter. The gods dwell here and the souls of mortals flow to here for their afterlife. The Inner Planes are, quite opposite of the Outer Planes, matter incarnate. The four main elements as well as positive and negative energy are purified into their own elemental planes. The Transitive Planes connect all of these together.