Air ???
Water The Unknown (Water+Earth) - A magic forest connected with most remote and wild areas of the material plane/Core Sphere
Earth ???
Fire ???
Material/Core/Prime/ Sphere
Utopia (Earth + Fire or Fire + Air) - The idea city
Slipstream (Air + Water) - Where all currents and winds both come from and eventually return
Domain of the Warrior - Where rule breakers are punished and heroes rewarded