Finding info on the nine layers of Hell is a bit tedious. Here's what I've come up with so far (so its a work in progress), while I was trying to dig up info for this publication: To Hell With You.
*Asterisks indicate novels, the rest are D&D publication.
Specific Layers
- Avernus
- Elminster in Hell (novel)
- Well of Worlds (Planescape - ADD 2e)
- Descent into Avernus (5e)
- Fire in the Blood* (a small scene in Avernus, with the party interacting with Tiamat).
- Dis
- Fires of Dis (ADD 2e)
- Minauros
- Phlegethos
- The Adversary* (a couple minor descriptions)
- Stygia
- A Paladin in Hell (ADD)
- The Shield of the Weeping Ghosts*
- Malbolge
- Brimstone Angels*, Lesser Evils*, The Adversary*, Fire in the Blood*, Ashes of the Tyrant, and The Devil You Know* (all of the Brimstone Angels novels)
- Maladomini
- Cania
- Shadowstorm* and Godborn* (Erevis Cale novels)
- Nessus
All Layers
- Guide to Hell (ADD)
- Manual of the Planes (ADD)
- Faces of Evil: The Fiends (Planescape - ADD 2e)
- Planes of Law (Planescape - ADD 2e)
- Planescape Campaign Setting (Planescape - ADD 2e)
- The Planewalker's Handbook (Planescape - ADD 2e)
- Fiendish Code II - Tyrants of the Nine Hells (3.5e)
- Manual of the Planes (3.5e)
- Dungeon Master's Guide (3.5e)
- Manual of the Planes (4e)
- Dungeon Master's Guide (5e)
- Mordenkeinen's Tome of Foes (5e)
- Dragon Magazine #28. The Politics of Hell.
- Dragon Magazines #75 & 76 (and republished in Dragon Magazine #400). The Nine Hells
- Dragon Magazine #223. The Lords of the Nine.
- Pipyap's Guide to the Nine Hells (DDAL00-11)
Honorable Mentions
- Hellbound: The Blood War (ADD). Discussion on the Blood War but no significant details on hell.
- Blood Wars (card game)
- Dragon Magazine #120. Dining Out in the Hells.
- Dragon Magazine #300. Hellish Fangs on Abyssal Wings.
- The Harrowing of Hell (DRW08) occurs in Avernus and Nessus
- Season 9 of Adventure League occurs in Avernus
- Infernal Encounters (DDAL00-12) includes numerous encounters in Hell
Here's my own homebrew version of Baatezu hierarchy.
