Limbo
Limbo is a plane of pure chaos, a roiling soup of impermanent matter and energy. Stone melts into water that freezes into metal, then turns into diamond that burns up into smoke that becomes snow, and on and on in an endless, unpredictable process of change. Fragments of more ordinary landscapes—bits of forest, meadow, ruined castles, and even burbling streams—drift through the disorder. The whole plane is a nightmarish riot.
Limbo has no gravity, so creatures visiting the plane float in place. A creature can move up to its Speed in any direction by merely thinking of the desired direction of travel.
Limbo has no layers—or if it does, the layers continually merge and part, each is as chaotic as the next, and distinguishing one from another is impossible.
