Outer Planes
The Upper Planes are the home of Celestials. The Lower Planes are the home of Fiends. The planes in between host their own unique denizens: for example, modrons are Constructs that inhabit Mechanus, and slaadi are Aberrations that thrive in Limbo. As with the Elemental Planes, one can imagine the perceptible part of the Outer Planes as a border region, while extensive spiritual regions lie beyond…