The Nine Hells of Baator, sometimes shortened to Hell or Hells, and named Baator (pronounced: /beɪˈɑːtɔːr/ bay-AH-tor) in Infernal, was the home of the devils and the plane that embodied lawful evil It was a plane of sinister wickedness and institutional cruelty, its denizens organized into a strict caste system with a very rigid chain of command. Each of the nine Hells had its own physical laws or properties of matter, but all were inhospitable or deadly to outsiders.
The Great Wheel cosmology model placed the Nine Hells in the Outer Planes between Gehenna and Acheron, with additional connections to Concordant Opposition and the Astral Plane. Each Hell was a different infinite layer interconnected at barriers much like a nine-layered cake—the lowest points of one layer manifested barriers that exited high above the surface of the next lower layer. The river Styx flowed through the first layer, Avernus, and also the fifth layer, Stygia, before crossing over into Gehenna.
When the Great Wheel model was overshadowed by the World Tree cosmology model, the river Styx was renamed the River of Blood and it flowed through all the fiendish Planes (except for the Supreme Throne and the Demonweb Pits) originating in The Abyss, passing through the Blood Rift—an unusual plane that connected The Abyss with the Nine Hells—bringing the devils even closer to their arch-enemies the demons, resulting in the Blood War.[28] The layers were still described as being infinite but with a central pit of finite size that opened to the next lower layer in a tiered fashion, with a drop of many miles between layers.Cosmologists verified portals between the Nine Hells and the Barrens of Doom and Despair and Clangor and, by agreement with Kelemvor, to the Fugue Plane. The Astral Plane connected all of the fiendish Planes to the Prime Material Plane, but not directly to each other.
“The Hells are not so simple to understand. Boiling down nine cosmological layers into 'evil, but with a few more rules' does generations of scholars discredit. Each layer is its own unique moral and magical ecosystem. What Zariel permits in Avernus may be blasphemy to Mammon in the chained cities of Minauros. The Hells bend not only to their whim and will, but to their mere presence. The more souls they acquire, the more that combined influence spreads.” — A letter from Sylvira Savikas
After the Spellplague, Asmodeus consumed the essence of the fallen Azuth achieving (some say regaining) greater godhood and ended the Blood War by casting The Abyss to the furthest depths of the Elemental Chaos. The World Axis cosmology model described the Nine Hells as an astral dominion floating in the Astral Sea, no longer of infinite size nor consisting of layers ruled by Asmodeus and his eight archdevil vassals. Once again the river Styx flowed through the Nine Hells and The Abyss, but then emptied its pollution into the Astral Sea.
Each of the Nine Hells was unique and usually mirrored the malevolent characteristics of its ruler, or perhaps the archdevils were shaped by the domains they schemed to control, no one can be certain. In earlier cosmologies, each Hell was a separate infinite layer rigidly joined to its neighbors by barriers at fixed locations. After the Spellplague, the domains of the archdevils were described as territories (large, but finite) or circles. The relationships between layers and circles are not fully known. What follows are descriptions of the nine Hells reported for different cosmological models that have been collated and summarized.
Inhabitants of the Nine Hells produced goods exported across the Planes, including to the planar City of Doors, Sigil. Green Baator ore and steel smelted from it was mined in Avernus. Another notable export was Baator's own whiskey. It was a pleasantly-smelling steaming-hot drink that resembled boiling goldflow. When consumed, it burned one's stomach with sweet pain. Very few mortals could stomach even a single shot.
The principal inhabitants of the Nine Hells/Baator were the devils, and their offspring in varieties too numerous to catalog here. See the main article for descriptions of the myriad devilkind. Unlike the demons of The Abyss, the devils were highly organized in their quest for power and status—scheming and plotting power plays, coups, and assassinations
.In addition to the devils, this plane was home to bonespears, gathra, haraknin, hell hounds, imps, night hags, nightmares, and maelephants.[1] Also occasionally encountered were achaierai, barghests, hellcats, mephits, rakshasa, and stench kows.
Beliefs about the journey of souls to the afterlife changed with the shifting cosmologies and the crystal sphere in which one resided. In some worlds, lawful evil souls were automatically destined for the Hells and arrived as mindless nupperibos or, if they were worthy, as semi-intelligent lemures. For mortals of Realmspace, however, souls first traveled to the Fugue Plane where they awaited escort to their final rest on the plane of their primary deity. While waiting, devils were allowed to bargain with the souls, playing on their fears and doubts to get them to agree that becoming a lemure with a chance for promotion was a better option than their suspected fate. Strong or crafty souls might negotiate a deal that reduced their time as a lemure or bestow a boon or punishment on those they left behind. After the Spellplague, Shar reshaped the Plane of Shadow and folded in what death energy did not get absorbed into the Elemental Chaos and created the Shadowfell. According to the World Axis view, souls on their way to the afterlife started their journey in the Shadowfell. Most made it to the Fugue Plane to await judgment, but a few remained behind or were lost.
The nine circles of Hell were each ruled by an archdevil of great power, but the Nine Hells were also the home of other powerful beings at various points in the history of the Realms. Listed here in alphabetical order are those that directly or indirectly influenced the course of events in Faerûn, Toril, and beyond.