Every read the Hawk & Fisher novels, there is one where they have to enter a prison and go to the wizard and gods area.
I would make it have a number of pocket dimensions, using Manual of the Planes, designing them with rules to hold a diffenert type of wizard. You could use standard cells for the lower power guys but the really powerful would be in the pocket dimensions.
I would make it have a number of pocket dimensions, using Manual of the Planes, designing them with rules to hold a diffenert type of wizard. You could use standard cells for the lower power guys but the really powerful would be in the pocket dimensions.