The Seven Planes of Existence

The multiverse has a strange unintelligible structure: imagine seven multidimensional concentric spheres, not isolated but strongly connected by uncountable multidimensional intersections. Here is a brief description of the Seven Planes of Existence:

1. The Primal Chaos: The Primal Chaos is a three-dimensional plane where the time-dimension is completely missing. It's a mass of pure condensed and motionless potential energy. When reaching this Primal Chaos there is no way to escape, except by being conjured from another plane.
2. The Material Plane: The Material Plane is four-dimensional (three space dimensions plus time). Yaqqothl and many other worlds are located on this plane.
3. The Outer Space: The Outer space is a multidimensional plane, home of the Great Old Ones. People from the Material Plane cannot survive here, unless properly protected by powerful spells.
4. The Dreamlands: The Dreamlands is the plane beyond dreams. Here lie the Forgotten Gods, as well as a number of strange creatures.
5. The Underworld: This plane is strongly connected to the Material Plane. It is, in a sense, indistinguishable, but much more dangerous due to its proximity to the Abyss.
6. The Abyss: The Abyss is the home of demons and the place where the souls of the inhabitants of the various planes migrate to after death.
7. Pandemonium: Pandemonium is the opposite of the Primal Chaos, a place where everything is in constant change. Here lies Azathoth and his court.