The Study of the Cosmos

The Universe consists of twenty-six Planes of Existence stitched together by The Weave, the eleven-dimensional structure of the universe. The Planes of Existence are categorized into two Transitional Planes, seven major Inner Planes, and seventeen major Outer Planes [plus a scientifically unfathomable number of coterminous sub-planes, demi-planes, and para-planes].

The two Transitional Planes are the Astral Plane and the Ethereal Plane. The Inner Planes are the four Elemental Planes (Earth, Air, Fire, and Water), and three Material/Energy planes (Positive, Prime, and Negative). The Outer Planes comprise seven heavens or Celestial Planes, three hereafters or Neutral Planes, and seven hells or Fiendish Planes.