A Shadow over Akeroth
When the Deities entered this Universe from the Pre-Verse, the Demons of the Abyss already existed in the chaotic void of space, however, the Demons did not know of the Deities until the creation of the first ordered world.
The demons, seeing this ordered creation as the ultimate perversion and feast descended upon it bringing forth chaos. Through the demons the races the inhabited these first planets tore at each other and devastated their worlds leaving nothing but darkness and chaos.
The Deities seeing the damage that the demons wrought, chose Nerull to be their vanguard and defend their ordered creations and for endless eons Neull did so, but the sheer number of the demons overwhelmed him, and many of the worlds were razed. Seeing this happen time and time again Nerull snapped, and joined the Demons seeing chaos as the true order of the Universe, and the Deities as the ultimate perversion.
The demons readily accepted Nerull among them and chose him as their leader, and with his power they went forth as a great legion and brought chaos upon all of the Deities creations. The Deities stunned at the lose of their brother created one final world as a last act of defiance, and this world, Akeroth, would be their most perfect and most protected. After Nerull entered onto Akeroth, he created Man, and from this point Man would be sent for onto Akeroth and quickly the situation would devolve into the Battle for Akeroth.
The Planes that occupy the Abyss are numbered as followed;
1 – Pazunia (also known as The Plain of Infinite Portals or The Palace of 1001 Closets) has been described as an infinite plane with only three types of distinct features:
The river Styx flowing through it (as it does through the top layers of other evil planes).
Large sinkholes which connect to other layers of the Abyss, some were drilled intentionally by ancient demons during the Abyss’ original exploration. The largest of these holes is the Grand Abyss.
Iron Fortresses which guard the physical bodies of Demon Princes when they leave the Abyss to travel astrally.
2 – Driller’s Hives, realm of Tharzax the Chattering Prince.
3 – The Forgotten Land, realm of Zzyczesiya the Ungrasped.
4 – The Grand Abyss, a bottomless, nigh-infinite canyon that contains portals to virtually every other layer in the Abyss.
5 – Wormblood
6 – Realm of a Million Eyes, home to the Great Mother, creator goddess of the beholders.
7 – Phantom Plane, realm of the demon lord of the lizard kings, Sess’Innek.
8 – The Skin-shedder, realm of Volisupula the Flensed Marquesse.
9 – Burningwater
10 – “That Hellhole”
11 – Molrat
12 – Twelvetrees
13 – Blood Tor, realm of the goddesses Beshaba and Umberlee from the Forgotten Realms setting. (2nd edition AD&D)
14 – The Steaming Fen, realm of the Queen of Chaos.
17 – Death’s Reward, realm of Abraxas the Unfathomable.
21 – The Sixth Pyre, realm of Kardum, Lord of Balors.
23 – Iron Wastes, home to Kostchtchie, Prince of Wrath.
27 – Malignebula, realm of the Abyssal lord Lissa’aere the Noxious.
32 – Sholo-Tovoth: The Fields of Consumption, realm of Turaglas the Ebon Maw.
45 – Rauwend is the first of the three layers that make up Graz’zt’s triple realm, which is collectively called Azzagrat. Other sources list these as layers 42 to 44. In First Edition AD&D, Graz’zt’s layer is an infinite palace which filled his entire layer.
46 – Shadowsky is the second of Graz’zt’s three layers.
47 – Vhoorzzt is the third layer of Azzagrat. Like Rauwend and Shadowsky, it is controlled by Graz’zt.
48 – Nerebdian Vast, desert realm bordering both Azzagrat and Shaddonon. (Dragon #360) Called Skeiqulac, the Ocean of Tears, in Demonomicon (2010).
49 – Shaddonon, realm of the demon lord Rhyxali, Princess of Shadow.
52 – Vorganund
53 – Phage Breeding Grounds
57 – Torturous Truth, realm of the Abyssal lord Alvarez the Purging Duke.
65 – Court of the Spider Queen, Lolth’s realm.
66 – The Demonweb Pits, home of Lolth, queen of spiders and principal deity of evil drow, particularly in the Vault of the Drow. In the first edition Manual of the Planes, Lolth’s Web is located on the 65th layer, from there access is possible to the 66th layer, where her realm and spider-ship is located.
67 – The Heaving Hills (Hezrou realm)
68 – The Swallowed Void
69 – The Crushing Plain (also called Gibbering Hollow, Ollomegh’s realm).
70 – The Ice Floe
71 – Spirac, hunting grounds of the demon lords.
72 – Darklight, realm of Nocticula the Undeniable.
73 – The Wells of Darkness, which has served as the prison of several demon lords such as Shami-Amourae, Ansitif, and Ebulon.
74 – Smargard, home to Merrshaulk the yuan-ti deity and Ramenos the bullywug deity. Also contains The Viper Pit (Sseth’s realm; Powers & Pantheons), and the Silent Temple (Planar Handbook).
77 – The Gates of Heaven, realm of Munkir and Nekir.
79 – The Emessu Tunnels, realm of Anarazel the Daring Darkness.
81 – The Blood Shallows, contested realm.
88 – The Gaping Maw (or Brine Flats or Abysm), home to Demogorgon, Prince of Demons, one of the highest-ranking demons in the abyss.
89 – Shadowsea, oceanic realm of the demon lord Dagon, Prince of the Depths.
90 – The Guttering Cove, realm of Ilsidahur the Howling King.
92 – Ulgurshek
99 – Unnamed contested layer consisting of several distinctive realms (from first edition AD&D module Tales of the Outer Planes); one is where demons are spawned, another is a lightning realm, in another can be found portals leading to Juiblex and Kali’s layers.
100 – The Barrens (Oublivae’s realm).
111 – The Mind of Evil, realm of Sch’theraqpasstt the Serpent Reborn.
113- Thanatos, the realm of Orcus, Demon Prince of the Undead. Some sources quote this as layer #333 or #133.
128 – Slugbed, realm of the Abyssal lord Lupercio the Baron of Sloth.
137 – Outcasts’ End, realm of Azazel, Prince of Scapegoats.
142 – Lifebane, realm of the god Chemosh from the Dragonlance setting. (2nd edition AD&D)
148 – Torrent
176 – Hollow’s Heart, realm of the demon lord Fraz-Urb’luu, which, due to his magical illusions, appears to be flat, colorless, and featureless to the human eye.
177 – The Writhing Realm, realm of Ugudenk the Squirming King.
181 – The Rotting Plain, realm of the troglodyte god Laogzed.
191 – Fountain of Screams
193 – Vulgarea, realm of the foxwoman goddess Eshebala.
222 – Shedaklah (aka The Slime Pits), home to Juiblex Demon Prince of Slimes, and Zuggtmoy, Demon Queen of Fungi.
223 – Offalmound, former realm of the dead god Moander from the Forgotten Realms setting. (2nd edition AD&D)
230 – The Dreaming Gulf, a windy realm home to the dreams of dead gods.
241 – Palpitatia, realm of the bugbear gods Grankhul and Skiggaret.
245 – The Scalding Sea
248 – The Hidden Layer, realm of Eltab.
274 – Durao (gateway layer), mustering ground for the armies of the Abyss as they prepare for battle in the Blood War.
277 – Belistor, Yrsillar’s realm.
297 – The Sighing Cliffs, realm of the Demon Lady Lynkhab.
300 – Feng-Tu, realm of the Chinese gods Tou Mu and Lu Yueh.
303 – The Sulfanorum
313 – Gorrison’s Grasp, site of Illssender’s Tower
333 – The Broken Scale, realm of the god Hiddukel from the Dragonlance setting. (2nd edition AD&D)
340 – The Black Blizzard
348 – Fortress of Indifference, ruled by Tapheon, the nalfeshnee; former realm of the demon lord Thralhavoc.
357 – The Arc of Eternity, realm of Eldanoth the Bloodless Scion.
377 – Plains of Gallenshu
399 – The Worm Realm, realm of the gnome god Urdlen.
400 – Woeful Escarand (Nalfeshnee Realm), a court at which newly arrived larvae and sometimes other demons are judged
403 – The Rainless Waste, site of Mal Arundak, the City of Confusion (Fallen archon realm)
421 – White Kingdom, ruled by the King of Ghouls, once a vassal to Orcus, vassaled to Yeenoghu, briefly a free agent, and now vassaled to Yeenoghu again.
422 – The Seeping Woods, ruled by Yeenoghu, Demon Prince of Gnolls. Called “Yeenoghu’s Realm” in Fiendish Codex I: Hordes of the Abyss.
423 – Galun-Khur(home of the abyssal eviscerators)
444 – Morass of the adarus
452 – Ahriman-abad, realm of Ahrimanes, Chief of the Cacodaemons.
471 – Androlynne, realm of Pale Night.
487 – Lair of the Beast and Mansion of the Rake, realm of the vampire god Kanchelsis.
489 – Noisome Vale, ruled by the balor Tarnhem.
493 – The Steeping Isle, realm of Siragle the Ineffable.
499 – Carroristo
503 – Torremor, realm of the demon lord Pazuzu.
507 – Occipitus, former realm of Adimarchus, the demon prince of madness.
518 – Melantholep possible name of the nesting grounds of the chole dragons, or perhaps an unknown demon prince who rules the layer.
519 – March of the Pierced Men.
524 – Shatterstone, realm of the ogre god Vaprak.
528 – Molor, the Stinking Realm is a layer under the control of Juiblex. It includes the town of Thullgrime and a bottomless cavern known as the Maw of Eternity. It’s described in the 4th edition supplement The Plane Below.
531 – Vudra, realm of the giant marilith Shaktari, the Queen of Poison.
548 – Garavond, Haagenti’s realm.
550 – Forest of Living Tongues.
558 – Fleshforges, realm of Dwiergus the Chrysalis Prince.
566 – Soulfreeze, realm of Aseroth the Winter Warlock.
570 – Shendilavri, realm of the demon lady Malcanthet, Queen of the Succubi.
586 – Prison of the Mad God, realm of the derro god Diinkarazan.
597 – Goranthis, realm of Socothbenoth the Persuader.
600 – Endless Maze, the realm of Baphomet, Prince of Beasts. The demoness Pale Night resides here as well.
601 – Conflagratum, realm of the Abyssal lord Alzrius, Lord of Infernal Light.
628 – Vallashan, a layer designed to allow temporary victory to conquering armies of good alignment, only to then corrupt the conquerors and turn them against themselves
643 – Caverns of the Skull, realm of the Black Earth Mother Kali, the goddess of destruction. In First Edition AD&D, Kali’s layer was #500 and was a jungle of blood-red vegetation bordering a sea of blood.
651 – Nethuria, realm of Vucarik, Consort of Chains.
652 – The Rift of Corrosion
663 – Zionyn, realm of the demon lord Obox-ob, Prince of Vermin.
665 – Unnamed. A bottomless black void where victims fall until the winds flay the flesh from their bones. (Blood Hostages)
Demonwing is an Abyssal layer that has been changed by Demogorgon into a plane-crossing, flying ship. It features in the adventure A Paladin in Hell by Monte Cook.
The Plains of Rust is another unnumbered layer, once the site of a diabolic colony before Orcus and Juiblex caused all iron on the layer to crumble. It’s described in The Plane Below.
The Spires of Rajzak is a layer of canyons inhabited by demonic hordes and a maddened, indescribable demon lord known as Rajzak, also from The Plane Below.