Pandemonium

My god! The wind! The howling! It's driving me mad!

— An Ordinary thing to heara in Pandemonium

  The Windswept Depths of Pandemonium is the Outer Plane associated with the chaotic neutral and chaotic evil.  

Gravity

Gravity in Pandemonium always pulls away from the center of any cavern so a traveler can walk on the floor, walls, or ceiling. Streams and rivers will flow along one surface of a cave, or inexplicably down the middle through the air. The larger caverns are hundreds to thousands of miles deep, wide, and tall, and the winds there can lift up small humanoids and carry them far away before a dangerous landing.   In essence, gravity is oriented toward nearest wall a creature is closest to.  

Divinely Morhpic

Some exteremely powwerful beings, such as deities, could alter the Plane.  

Layers

Pandemonium has four known layers, each with slightly different conditions:  

• Pandesmos

  The topmost layer with portals to Limbo, the Abyss, and is called Pandesmos and is the most habitable layer of the four. This layer has the largest caverns and the river Styx flowed through the rocky wastes. Nearly all great cities and citadels in Pandemonium are found here.  

• Cocytus

  The second layer is called the layer of lamentation because the wind whistling through the tunnels carried the cries of anguish and the sounds of sorrow. The passages on this level are narrower making the noise shrill enough to drive insane anyone with unprotected hearing. Unlike the natural looking tunnels and caves of Pandesmos, the passages of Cocytus are carved by beings unknown to even the gods.
 

• Phlegethon

  The third layer is the layer of dark and damp. The walls are matte black and absorbed all light with no reflection—all light sources could only illuminate half as far as normal. Many rivers and streams cut through the black rock and the constant dripping of eons build up stalactites, stalagmites, and other cave formations.
 

• Aggathion

  The deepest known layer of Pandemonium and is made of solid rock with no tunnels and only giant spherical bubbles of air or vacuum. Those bubbles with a barrier to Phlegethon were filled with huge windstorms capable of flinging even large humanoids around. Pockets without a connection to the next level were often the final resting places of things that should not be awakened.

 

Inhabitants

Pandemonium has no known indigenous life forms but many inhabitants that are either immigrants, visitors, exiles, marooned, or prisoners. Quasits and shadow demons are plentiful, as well as many low- to mid-level demons and the occasional demon lord-in-exile.  

Afterlife

Many spirits of the most merciless bugbears travel to Pandemonium after death among many other the souls of mortals whose alignment in life was Chaotic Neutral or Chaotic Evil, and who do not owe allegiance to any specific deity residing in another plane.