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Gehenna was an Outer Plane in the Great Wheel cosmology model representing alignments between neutral evil and lawful evil.

Description
The four layers of Gehenna were infinite planes with gravity at a forty-five degree angle to the ground, making travelers feel as if they were on the side of a mountain with no base or peak. Anyone losing their footing could tumble for miles/kilometers before finding enough purchase on the slope to halt their fall. Nearly all terrain that was not a river of water or lava was slightly slippery to quite slick. All structures were either built onto or carved into the slopes. Heat and light came from the ground, much like Tarterus, but the source was volcanic: lava flows, vents, fumaroles, and mud pots were very common. Earthquakes and volcanic eruptions occurred often, tearing the land apart. On the hotter layers, unprotected flammable items and creatures would catch fire from the glowing ground or superheated gases being ejected. The barriers between layers were always underground, usually in dead end corridors.

Khalas
The uppermost layer, Khalas, was the most livable of the four planes with many waterfalls cascading down the slopes, the largest being the river Styx. The Styx followed a rough path down the slope, fell for thousands of feet/meters, ran through twisty rapids before finally disappearing into underground passages. Steam rose into the infinite and empty black sky making the horizon glow a dull red. Khalas touched the Astral Plane and had connections to Hades, the Nine Hells, and Concordant Opposition. The portals looked like black chasms in the floor of deep underground passages. Markings on the walls would often indicate the portal's destination, if you could read them.

Chamada
The second layer of Gehenna was the most violently active layer with lava cascades thousands of miles/kilometers wide and city-sized volcanoes yawning open on the slopes. The air was foul with acrid smoke for ten miles (16 km) above the surface and would cause blindness to unprotected eyes and had the effect of a stinking cloud on the lungs. Below ground the air was fresher but stank of burning flesh and hair.

Mungoth
Mungoth was a land of falling ash and burning snow. The furnaces of this layer were fewer and farther apart, allowing ice and snow to build up in the darker places between active areas. Travelers had to brave the never-ending avalanches of wet snow and fiery rock. Underground passages were relatively safe.

Krangath
The fourth layer was devoid of any volcanic activity, even underground. All was dark and cold. The name of this layer means literally "dead furnaces".

Inhabitants
The only creatures that were native to this plane were the barghests, running through the rifts of Khalas and occasionally found in smaller number on the other layers. All the other creatures originally came from the adjacent lower planes, mostly to hide from more powerful beings that wished to enslave them. Gehenna was often a plane of exile for the less powerful archdevils and daemon taskmasters.

Realms
Even lesser deities tended to avoid Gehenna. Those that leaned toward Law were recruited into the hierarchy of the Nine Hells and those that favored chaos tended toward Hades. Here is a list of the Powers known to have called this plane home at some point:
 * Bhaal, Lord of Murder, once had a realm here.
 * Loviatar, Maiden of Pain, had a fortress of ice in Mungoth before moving to the Barrens of Doom and Despair as described by the World Tree cosmology model.
 * Shargaas, Night Lord of the orcs, lived underground on Kraangath and controlled the deepest caverns of Mungoth before moving to Nishrek as described by the World Tree and World Axis cosmology models.