Name: The Chaos Realm
Limiter: None, usually
Tech Level: hahahahaha..... no

Cosmology:
An infinitely extending space, constantly morphing. Every element within the Chaos Realm is constantly transforming, entire cities appearing from nowhere only to devolve into an ocean of peanut butter. Anything can exist within this place, although it'll probably be something else in a moment. Obviously, this makes it a very dangerous place to stand.

Special Rules: 
This dimension is formed by emotions and dreams. The thoughts of every sentient being in the universe are constantly molding and rebuilding this dimension. Anything being thought of by any being at the moment exists somewhere in this realm. Beings inside of the realm also have an effect on their immediate surroundings. This place can literally manifest your greatest nightmares, or bring your happiest moments to life. Much more likely, though, it'll be shaped by whatever random thing is popping through your brain.

Factions: Infinite. Literally. Every imaginary world ever exists somewhere here, although only while people are thinking about it.