👉 Gehennom is the lower half of the dungeon, home to demon lords, powerful undead and the Wizard of Yendor.
Gehennom begins directly below the Underground Castle, which is on level 24 or 25, and is 18 to 20 levels deep. Dungeon Layout gives the depth of each of its special levels.
The ordinary levels between the special ones are caverns. Half of them are lit, and two in three have lava along the edges of the map and a lava river across it. Fire traps are generated at random only in Gehennom, and there at least one random trap in five is a fire trap, so fire resistance is close to a requirement.
🚩 Special Levels and Branches
- Valley of the Dead is the first level, full of graves and undead, with a temple of Moloch.
- Dis, Maladomini, Jubilex's Realm, Orcus Town and Yeenaghu's Domain are the domains of demon lords.
- Lair of Tarrasque belongs to the Tarrasque, a unique monster but not a demon lord.
- The stairs up to Vlad's Tower are in the middle of Gehennom.
- Plane of the Modron and Hellish Pastures are GnollHack branches, reached through portals.
- The Wizard of Yendor waits with the Book of the Dead in the heavily guarded Wizard's Tower. Its entrance is a portal in one of the two decoy Fake Wizard's Towers.
- The vibrating square is a hidden square on the lowest ordinary level, which is a maze. You must find it to perform the Invocation, which opens the way down to Moloch's Sanctum, the last level.