Pandemonium

Pandemonium is probably the least inhabited of all the Outer Planes. And for good reason: It's arguably the least hospitable. Sure, there are hotter planes and colder ones, ones with crueller denizens, and so on, but none are any lonelier or more maddening. This birdcage's like an endless cave system, filled with winds that scream their way from one side to the other. Those cutters in the Bleak Cabal think it's a decent place to set up shop, but they're about the only ones

Pandemonium is made up of cavernous tunnels twisting through solid rock, and it's filled with howling winds. These tunnels range in size from mere crawlways to huge bores miles in diameter. No matter what the size, though, nearly all have two things in common: First, gravity within them is oriented toward whatever wall a cutter's nearest at the time. Second, they're filled with the eternal wailing of winds. In some cases this is little more than a breeze, carrying distant echoes that sound like the cries of beings in torment. In others it blows with supernatural force, causing a deafening caterwauling felt more in the bones than heard in the ears, making even the largest of caverns throb with its intensity. 'Course, in such gales the noise is the least of a berk's troubles. Winds that fierce can pick up a poor sod and carry him for hundreds of miles, banging his body off rock formations until there's nothing left of him.

Given the infernal noise on this plane, it shouldn't be surprising to learn that most of the poor sods here are barmy in one way or another. Oh, they may seem perfectly sane when a berk first meets them, but their madness will show when least expected.

Along the Great Road, Pandemonium is between the Abyss and Limbo.

Note: Pandemonium originally appeared in the Planescape AD&D campaign setting from TSR. Its use here is for the purposes of providing context for the campaign only.