Dark Forest
The Dark Forest was built on and perpetuates feelings of negativity. It's enshrouded in fog, and areas may shift and rearrange. One may encounter the same dead trees and dark rivers many times or even places that hardly resemble reality at all.
The demons are the most dangerous, infamous, and long-lived of the Dark Forest's residents. They tend to be highly solitary.
To survive, some cats in the Dark Forest travel with one another in factions, the shadows of proper clans.
Wraiths form the bulk of the Dark Forest's population. They travel alone, spending their time quarreling for survival and living in shadows.
Some cats from outside the focal clans are sent to the Dark Forest. They tend to have less power and substance.