Editing Planes of Existence (section)

== Space Between Worlds ==
Each world (collection of celestial spheres) is suspended in a permeable and breathable gas known as the Space Between Worlds, or the White Fog. This fog is the remnant of the Astral Sea, which once permeated the entirety of the multiverse, but is now solely a part of the Outer Planes, due to the Prism. 

The Space Between Worlds is a vast fog ranging from bright white to a light gray, with a density much like fluffy clouds and a swirl of various colors winding through it. This swirl is the Weave. Since it is so bright, the titans created the Backdrop as the last layer of the celestial sphere to allow nightfall for the mortals to sleep. The Backdrop was also created as a map so the titans could easily travel between worlds without getting lost. Some later Backdrops were created with “artistic” intent, with some even being generated by the Arbiters themselves.

It is customary to poke holes in the Backdrop to allow some light to filter in, as complete blackness is known to drive mortal creatures insane. (“Pitch black is no different than the Far Realm, and brings madness to all who die.”) These holes also allow the sphere to be suffused with magic from the Weave, which helps power the other spheres, mainly the sun.

Beyond the Material Plane are three planes known as Echoes: the Ethereal Plane, the Feywild, and the Shadowfell. Surrounding the Material Plane are the Planes of Time: the Past and the Future.

Most creatures of their world will never know that other worlds exist. Others are capable of creating devices, or harnessing magic, that allow them to traverse between worlds.

Known worlds include Avo, Khalin, Norvair, Toril, Eberron, Tirea, and Exandria.