Lexicon of the Abyss

Though commonly believed to have 666 layers, some sages believe the true number to be infinite. Here is a list of all recorded layers of the Abyss alongside their layer number and the demon lord that rules each layer.

Layer Number	Layer Name	Lord
1	Plain of Infinite Portals	Pazuzu
2	Driller's Hives
3	Forgotten Land
4	Grand Abyss
5	Wormblood
6	Realm of a Million Eyes	Great Mother
7	Phantom Plane	Sess'inik
8	Skin-shedder
9	Burningwater
10	That Hellhole
11	Molrat
12	Twelvetrees
13	Blood Tor	Beshaba and Umberlee
23	Ice Wastes	Kostchtchie
27	Malignebula	Lissa'aere
45	Azzagrat	Graz'zt
46	Azzagrat	Graz'zt
47	Azzagrat	Graz'zt
57	Torturous Truth	Alvarez
66	Demonweb Pits	Lolth
67	Heaving Hills
69	Crushing Plain
70	Ice Floe
71	Spirac
72	Darklight
73	Wells of Darkness
74	Smargard	Merrshaulk and Ramenos
88	Gaping Maw	Demogorgon
113	Thanatos	Orcus
128	Slugbed	Lupercio
142	Lifebane	Chemosh
176	Hollow's Heart	Fraz'Urblu
181	Rotting Plain	Laogzed
193	Vulgarea	Eshebala
222	Slime Pits	Juiblex and Zuggtmoy
223	Offalmound	Moander (now dead)
241	Palpitatia	Grankhul and Skiggaret
248	Hidden Layer	Eltab
274	Durao
297	Sighing Cliffs	Lynkhab
303	Sulfanorum
348	Fortress of Indifference	Tapheon
377	Plains of Gallenshu	Amanite
399	Worm Realm	Urdlen
400	Woeful Escarand
403	Rainless Waste
422	Seeping Woods	Yeenoghu
487	Lair of the Beast	Kanchelsis
489	Noisome Vale	Tarnhem
499	Carroristo
503	Torremor	Pazuzu
507	Occipitus
524	Shatterstone	Vaprak
531	Vudra
566	Soulfreeze
586	Prison of the Mad God	Diinkarazan
600	Endless Maze	Baphomet
601	Conflagratum	Alzrius
643	Caverns of the Skull Goddess	Kali