Satan's Palace (InstanceTopic, 23)
From Compile Worlds
Satan's Palace is a huge palace that was spawned from nowhere by Satan in Compile Worlds. It has only appeared in Episode 24, where Satan and Doppelganger Arle escaped into it via a portal to elude Doppelganger Schezo. Currently these two are it's only residents, and not much is known about the palace itself, other than that it exists in it's own parallel dimension.