The Astral Plane is like a computer network of human minds. It appears slightly different for every person but normally appears as a solid white plain with a solid white roof and walls at the very extreme edges of sight. Every object and person that exists in the real world appears very faintly as a light blue color, getting brighter and more prominent the more psychically powerful they are. Spectral entities can be seen here as a very faint green glow, but they cannot interact or be interacted with on the Astral Plane.
Certain creatures are native to the Astral Plane. Primary among these are the Akashic Keepers, who may be the intelligent souls of the once-humans who created the Plane originally. They currently guard a section of the Plane known as the Akasha, which most people perceive as a huge library. This library contains all the information of humanity, present, past, and future, and is fiercely guarded by the Keepers.