Limbo

The Everchanging Chaos of Limbo is the Chaotic Neutral Outer Plane in the D&D Great Wheel cosmology.

It is the plane of ultimate Chaos and randomness, where matter and thought collide, allowing for infinite possibility.

Though unlike THAT other realm of Chaos that we all know about, Limbo is FAR less hazardous to your health; your physical body will not dissolve on entry and neither will your soul immediately be twisted into something to serve the whimsy of Dark Masters.

Geography and Traits

As a rule, Limbo does not have a discernable geography. The plane is primarily made up of "Chaos Matter" which is and endlessly roilibg and toiling stuff of no constant physical substance or appearance.

A pocket of air might suddenly congeal into water, harden into stone, then spontaneously ignite into flame, before bubbling into water again... There's no particular pattern to what might happen next, and it might give you the impression that Limbo is inhospitable.

Thankfully, Chaos matter can be shaped into something else merely by willing it into something else and there exists guilds of "Anarchs" who spend their days doing just that. At the most basic level, any person can create a pocket of stabilised air for them to breath without any fuss. More complex combinations of elements can be created with stronger minds to hold it together, allowing individuals or groups to create virtually anything imaginable and imbue their creations with any trait they can conceive of... From a field of rainbow unicorns to a river of boiling piss.

This makes travel fun, as areas dominated by "Air" allow users to fly (or fall) in a chosen direction, where swimmers could create "Water" for themselves and move that way. You could also go more complicated and build an imaginary road for yourself if you simply wanted to walk somewhere.

Those areas of controlled Limbo last as long as the creator maintains his interest, or unless someone else is around to maintain control for him. Otherwise it all just melts back into chaos matter, so woe betide anyone who falls asleep in his stabilised area without someone to keep watch.

The most powerful minds can imbue a level of permanency on the chaos-stuff, so they don't have to worry about it dissolving when they stop paying attention. Nor do they need to be concerned about someone else's idle thoughts punching holes in it accidentally, so it is those areas of stable matter that population centers can most often be found.