A realm where the world is ruled by a strange and subtle and possibly insane deity. No one really knows anything about them; the world simply changes randomly. Towns and inhabitants are conjured out of nothing, as though they had always been there... then fade away at random intervals. Items taken from this realm often vanish some time later, without warning. Other gods have tried to invade and take over, but have been driven back by armies that materialized out of nowhere around them. It is a realm of mystery and secrets, where the very fabric of reality is weak.
A realm whose ruling deity was recently either slain or driven into hiding. Two major realms now fight an ongoing war here. If one ever manages to achieve dominance, they'll start drawing the realm into their own control, but right now it's a vicious and destructive stalemate.
Arborelle, the Realm of Forest. Ruled by a nature-oriented deity, it's a relatively peaceful place. Rather than constructing buildings, they use nature magic to shape living trees and exposed rock into the shapes they desire. As such, it lacks serious siege engines and such, but has a lot of fierce and fanatically loyal warriors as well as animate vines and trees that can be turned against invaders.