Gehennom

Gehennom is the underworld of NetHack since NetHack 3.1.0 (prior to this the underworld was Hell). It is found beneath the Valley of the Dead, and is full of mazes. A prayer in Gehennom is considered a prayer to Moloch, which can anger your god, amongst other things. The lairs of several demon lords and princes are found in Gehennom, as are the stairs to Vlad's Tower and the Wizard's Tower, as well as a couple of Fake Wizard's Towers. At the bottom level of Gehennom is the vibrating square. When the invocation ritual is performed on the vibrating square, a downwards staircase to Moloch's Sanctum is created, plus a ring of water and fire traps around you.

Although it is no longer an instadeath to enter the underworld without fire resistance, you should still strongly consider it, since Gehennom is one of the areas where fire traps can be randomly generated.

Many of the monsters found in Gehennom are resistant to fire, but not to ice, so Frost Brand is a popular weapon for this area.

Monsters found in Gehennom are:

Asmodeus Juiblex Baalzebub Vlad the Impaler Orcus wraiths ghosts zombies liches mummies quasits

xorns jaguars minotaurs scorpions elves ravens titanotheres vortexes rust monsters centaurs xans

winged gargoyles spheres long worms umber hulks dragons major demons zrutys horses elementals vampires purple worms

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