And a third list of layers of the Abyss.

Lots of material to draw upon for the development stage.

LayerNameNotes
1JhaatMost common Astral entry layer to the Abyss, this layer also connects to Stygia, Pandemonium, and Sarendathos, as well as approximately 83 internal layers (one-eighth of the Abyssal planes)
4 Court of Aeskylos, the Shaper.  This plane is animate and malleable to his whim, and connects to layer 500.
12 Court of Shabriri.  This plane connects to the layer 393.
45 A desert plane of arid scrub, which connects to Syrithol (Xalta’s first plane), and layers 205, 361, and 425.
54 Court of Sceirion.  All four planes are interconnected throughout, and share planar geographical features.  The Keep of Rhieaz is Sceirion’s stronghold.   
55 
56 
57 
65 Court of Lolth, Demon Queen of Spiders.  The 65th layer is Lolth’s secondary domain and hidey hole, the 66th is her web.  Her web connects to the layer 500, and both layers connect to various alternate Primes through permanent gates that Lolth has created as invasion routes.
66 
73 A Prime-like layer wracked by constant storms.  It also connects to layer 371.
74 Stygia impinges upon this layer.
79 A Prime-like plane of magical weakness.  No spells greater than 6th level will function (including magic item effects).  This plane connects to layer 371.
85 A mountainous layer, and home to many abyssal dragons, this was also the court of the Tiamat pretender Miatta.  Miatta’s hoard and consorts were scattered after her demise at the hands of Trillz the Dark.  
101The Endless EnigmaA prison layer of non-euclidean and tesseractian chambers, created through the combined powers of Alrunes, Fraz-Urb’luu, Sceirion, Obox-ob, and Abraxus.  This level is often the destination of gate traps.  The only being to have ever escaped its confines, Baphomet, entered on a bet and emerged 7500 years later.  Most demonic scholars believe that each of the plane’s creators built special strongholds and caches throughout its structures.  In addition to creatures indigenous to this unique environment, the plane is inhabited by various failed experiments, political prisoners, invaders, adventurers (Prime-planar, demonic, and otherwise), and such.   
120 Court of Yeenoghu, Demon Lord of Gnolls and Ghouls.  Layer 120 is a hilly, forested plane, and Yeenoghu’s personal domain where he hunts.  Layer 121 has similar geography, and is a training-ground for Yeenoghu’s gnolls, gnoles, gholes, thouls, ghouls, trolls, and legions of demons.   
121 
149 Court of Baphomet, High King of Demonkind.  Baphomet’s layer is mazey, with various open “courtyards” that contain forests, seas, and his palace (at the center of the plane, of course).  The demon Belitfint is Baphomet’s chief aide and major domo.  This layer connects to Labyarax (Sarendathos’ first layer).  
153 This chaos plane connects to Limbo and layer 371.
184 This plane is an empty husk, a barren vacuum.  An open conduit to the Negative Material plane has drained this plane of all life.  For all practical purposes, this plane is an extension of the Negative Material Plane, and all magics that require contact with that plane function normally on this layer of the Abyss.  
212 The Dead Court of Orcus.  These planes are a huge graveyard wherein all known and unknown forms of undead are represented among the populace.  Chadun is Orcus’ chief lieutenant, who controls entrance to the plane through the unnamed city of bones which guards access to Orcus’ realm.  
213 
214 
215 
222 Court of Tsuggtmoy, Demon Queen of Fungi.  This layer is a vast plain of moldering fungus which sinks into vaporous swampy masses of putrescence.  Rivers and lakes of slime cross its surface.  Tsuggtmoy holds court in a bowl-like depression in the lowest depths of the layer’s swamps.  This plane connects to layer 457.
229 A spatial plane of white and black geometry, clouded by shades of grey.  This plane is home to many xuphaitz demons, and other, odder creatures.  Think M. C. Escher.  This layer connects to layer 371.
246 A prime-like layer of rifts, hills, and craggy mountains.  This plane is home to many races of giants, and connects to layers 444 and 471 (Kostchtchie).  
247 A swampy fen layer which houses many will-o-wisps, hags, lower demons, etc.  This plane connects to Xalta’s plane Ocanthrus, and also serves as a temporary home for those who wander in from there (stray Abishai and Barbed devils, the explorative barghest, etc.).  
248 Stygia impinges on the Abyss again on this plane, and forms a large “lake” (anywhere but the Abyss it would be an ocean).    
267 Library of Gresil.  Three planes of row and rows of books, scrolls, tapestries, and other records enclosed in stone shelves.  Paved flagstone floors and walls, ceiling that just go up . . .  Gresil’s library demons now who is permitted to delve the archives.  This plane is neutral ground, at least temporarily, as few demons are willing to risk Gresil’s wrath.  
268 
269 
294 “The Incessantly Sublime Court” of the departed (?) Obox-ob.  This plane plays with one’s mind, body, and soul.  It connects to layer 393.
307 Stygia impinges . . . 
317 Decadent Court of Noticular, Mistress of Vampires, wherein all you see is fit to eat, drink, or drain . . . . 
329 to  346  The Court of Graz’zt.  This covers far too much planar ground to bother going into any detail here.  Layer 333 is Graz’zt’s seat of power, and connects to layer 393.  
(340) Once-court of Morflos, Balrog Lord, absorbed by Graz’zt in its owner’s absence.
350 Court of Azazel, Demon Lord of Snakes.  These planes are amazonian jungle levels filled with rainforests, rivers, and snakes in all colors, shapes, and sizes.  Yuan-ti and  ssilhex are native.  Demogorgon is known to have visited this plane prior to his disappearance.   
351 
371 A barren and rocky plane which was once volcanic.  Obsidian shards and ashen desert wastes.  This plane connects to layers 73, 79, 153, 229, and 407; Stygia also crosses this layer’s schalla (toward Pandemonium).
381 Once-court of Pazeuzeus.  A spatial layer with pewter sky, no sun, and murky clouds in a variety of colors (purple, brown, black, deep ocean green).  Pazeuzeus’ open-aired cloud palace floats randomly about the plane since his insanity.  
393ZegrentilandibThis plane is sentient, and Prime-like, but with fleshy ground.  This plane is a nexus, and connects to Stygia, Mykhaz (Sarendathos’ fourth plane), 12 (Aeskylos), 294 (Obox-ob), 333 (Graz’zt), 407 (Mandrillagon), and 19 other layers (1, 7, 36, 49, 85, 143, 172, 179, 300, 309, 364, 389, 396, 404, 462, 512, 599, 646).
407 Forest planes of Mandrillagon, filled with huge trees, apes, various and sundry primates, tribes of primitive humans?, etc.  Plane 407 connects to layer 393.  
408 
409 
421 Soneillon’s Gardens and Salons of Debauchery.  A largely Prime-like, though small, plane, Soneillon’s Court offers the finest arts of harlotry, hedonism, and such . . . .
432 A tiered plane, which connects to the depths of Mykhaz (Sarendathos’ fourth plane), with a fair amount of daemonical traffic.
444 A sentient plane, with bestial appetites and instincts.  It tries to gobble up those who intrude upon it by animating itself in interesting manners.  It connects to layer 246.  
451 A Prime-like plane of dark forests, with no sun and seven moons.  Many drow live here, or make it a point to visit this layer while in the Abyss.  This layer connects to Chamada (Hades’ third plane), and many daemons and gigantes travel between the realms.
453 Stygia impinges
457 Once-court of the deceased demon lord Juiblex.  This layer is being annexed by Tsuggtmoy, who can offer some consolation to the lordless slimes, jellies, puddings, etc.  This plane connects to layer 222.
471 Court of Kostchtchie.  471 is a frozen, mountainous layer, covered over by glaciation, and home to frost giants.  472 and 473 are tundra plains covered with fir forests and share a sun.  474, recently taken, is a temperate Prime-like layer which is now succumbing to an ice age.  Plane 471 connects to layer 246.
472 
473 
474 
492 Stygia impinges in a cascading waterfall, which pools in a large lake, and drains out of the Abyss.  Ancient watch towers stand on either shore of the falls; they are generally unoccupied.  
500 A Prime-like, tiered layer with two white suns and a ringed, asteroid-strewn sky of purple (with silver/pewter clouds).  This plane connects to Stygia, Pazandillan and Pheletho (Sarendathos’ second and third planes), as well as layers 4, 65, 546, and twelve others (1, 19, 27, 200, 257, 285, 304, 416, 438, 449, 497, and 602).
510 Court of Aseroth, Demon Lord of Githyanki and Regent of the Silver Realm.  This layer is essentially a demonic Astral plane, and spells that require a connection to that plane will function normally.  Githyanki, astral islands, and voidships abound, in addition to the usual motley assortment of demons.
528 Court of Socothbenoth.  A Prime-like realm, with cities, sky ships, and a Lord among the Firstborn.  Uliel, a balrog of considerable power, is Socothbenoth’s castellan.
532 A Prime-like plane of magical strength which allows up to 10th level spells to function, with and temporal distortion as a side-effect.  This effect usually manifests as accelerated aging.  Alrunes is the only being who habitually uses this plane, and it is often another popular destination for gate traps.
546 Court of Demogorgon (see his listing for a description in detail).  Layer 546 connects to layer 500.  
547 
548 
549 
550 
564 Stygia impinges on the Abyss in a gaseous, Bespin-like spatial layer.  Styx is a free-floating stream, with no bed.
606 Court of Gothmog, Demon Lord of Balrogs.  A hellish set of volcanically-paired planes:  layer 606 is the mounts, vents, ash, and slag, while 607 is an underground maze of passages, lava tubes, magma lakes, etc.  Gothmog’s palace rests on a vast pool of bubbling lava, in a huge crater.  
607 
637CarynachThis plane’s name means “The Empty Place” in demonic.  It is a mystery level, since no other layers connect or allow entrance to it.  No gates will open to this plane, from anywhere in the mulitverse.   
651 Stygia impinges
656 Prime-like, a heavily fortified plane which connects to Avernus (Hell’s first plane).  
662 An oceanic, Prime-like layer with island chains, a pink sun, yellow sky, white clouds, and blue/green water.  The Ethereal plane connects to this layer, and magics which require contact with that plane will function normally here.  
666 Court of the missing Fraz-Urb’luu.  An illusory layer of deception.  This plane is under Fraz-Urb’luu’s mental control.  It currently appears flat and featureless.  

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