PANDESMOS

The top layer of Pandemonium contains the largest number of caves, some hundreds of miles wide, with the wind blowing constantly through it all. Some latent property in the stone on Pandesmos makes gravity behave strangely – creatures and travelers can move along the floors, walls, and ceilings with equal ease. This spider climbing effect is detailed under Hazards & Phenomena.

The River Styx winds through portions of Pandesmos as well, creating an easy and navigable route into and out of the plane (though it too obeys its own gravity laws, and in the same cavern can flow up the wall, over the ceiling, and down the other side without spilling a drop).

One of the few permanent settlements on Pandemonium, Madhouse, sits in an enormous cave on this layer. Flickers of magical light dance in the crowded streets, winking in and out of existence, adding to the mysterious allure of the city.