Pandemonium

In the standard cosmology of the Dungeons & Dragons fantasy role-playing game, the Windswept Depths of Pandemonium is the Outer plane where Chaotic Evil and Chaotic Neutral petitioners are sent after death. Pandemonium is a large, complex cavern that never ends. Compounding this problem, howling winds that drive most of its residents mad. There are few creatures that are native to this plane; those individuals who do live there usually have no choice in the matter. It is one of a number of alignment-based Outer Planes that form part of the standard Dungeons & Dragons (D&D) cosmology, used in the Planescape, Greyhawk and some editions of the Forgotten Realms campaign settings.

In the Planescape campaign setting, Pandemonium houses the headquarters for the Bleak Cabal faction.

Layers

Each of the four layers of Pandemonium is successively deeper within the caverns.

The gnoll deity Gorellik wanders throughout Pandemonium.

Pandesmos

Pandesmos is the largest and (relatively) most hospitable of the layers. The headwaters for the Styx are found here.

Pandesmos is the location of a number of godly realms, including Loki and Auril's realm of Winter's Delight, Talos' realm of Towers of Ruin, and Ho Masubi's realm of Uchi-bi.

Cocytus

Cocytus is also known as the "layer of lamentation", for this is where the winds are the strongest.

Cocytus is the location of a number of godly realms, including the god Erythnul's realm of the Fields of Malice, the bugbear deity Hruggek's realm of Hruggekolohk, Cyric's realm of the Shattered Castle.

Phlegethon

Phelgethon is the location of a number of godly realms, including the Queen of Air and Darkness's realm of the Unseelie Court, Zeboim's realm of The Maelstrom, and the derro deity Diirinka's realm of Hidden Betrayal.

Agathion

Agathion mainly contains holes, which double as portals to other planes.

Historical inspiration

The name Pandemonium comes from Pandæmonium, the capital of Hell in John Milton's Paradise Lost. The name means "all-demons" in Greek.

Cocytus and Phlegethon are two of the rivers from Hades in Greek mythology, and Cocytus is also the name of the lowest level of Hell in The Divine Comedy.

Fauna

• Howling dragon

Pandemonium is the Howling Plane, the plane of madness, darkness, and deafening winds. It is where Chaos turns sick and damaged, becoming mentally ill, demented and deranged. It is a place of winding, mazelike tunnels with no rhyme or reason behind them. People of all stripes are sometimes banished to Pandemonium, including demons fleeing the wrath of the Abyssal lords, slaadi grown too grim and terrible for Limbo, and mortals banished by evil spellcasters or their own psychoses.

Pandemonium has four known layers: Pandesmos (which borders the Outlands, the Astral, Limbo, and the Abyss), Cocytus (which was seemingly carved out by some ancient, maddened civilization), Phlegethon (even darker and stranger), and Agathion, which is a prison for artifacts and beings too terrible even for the gods to bear.

The River Styx runs through Pandemonium in trickles and small streams, not yet joined into the great dark torrent that flows through the other Lower Planes. It also much less potent in Pandemonium than elsewhere.