Gehenna (ge-hen-na)
(https://forgottenrealms.fandom.com/wiki/Gehenna)
The Bleak Eternity of Gehenna was an Outer Plane in the Great Wheel cosmology model, representing the alignment between neutral evil and lawful evil.
Mount Olympus is connected to Gehenna at randomly changing locations throughout the plane. It was unclear why the mountain had a connection to the plane at all, but some sages speculated that the mountainous character of the plane attracted the planar conduit there.
Inhabitants:
The only creatures known to be native to this plane were the barghests, which ran through the rifts of Khalas and were occasionally found in smaller numbers on the other layers, and the pyroclastic dragons. 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.
Geography
The four layers of Gehenna were infinite planes with gravity at a forty-five-degree angle to the ground, making travellers feel as if they were on the side of a mountain with no base or peak. Anyone losing their footing could tumble for miles/kilometres 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 Tartarus, 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 hill, 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 appeared as black chasms in the floor of deep underground caverns. While there was no way of telling where these would lead, intelligent travellers had made markings on the walls by many of them to indicate the portal's destination, if one could read them.
Chamada:
The second layer of Gehenna was the most violently active layer with lava cascades thousands of miles/kilometres wide and city-sized volcanoes yawning open on the slopes. The air was foul with acrid smoke for 10 miles (16 kilometres) above the surface and would cause blindness to unprotected eyes, having the effect of a stinking cloud on the lungs. Below ground, the air was fresher, but it still 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 accumulate in the darker areas between active areas. Travellers 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, both above and below ground. All was dark and cold. The name of this layer meant literally "dead furnaces".
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