Themed room

The following information pertains to an upcoming version (NetHack 3.7.0). If this version is now released, please verify that it is still accurate, then update the page to incorporate this information.

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Themed rooms are a type of rare room that appear in NetHack, based on the 'random vaults' of UnNetHack. Some themed rooms are simply unusual shapes, while others have contents unlike those that appear anywhere else. Some themed rooms can be further transformed into other special rooms.

Generation

There is a ³³⁄₁₀₃₃ chance (approximately 3.2%) that the game will attempt to place a themed room instead of a normal random room.

List of themed rooms

Name	Can be special	Normal room contents	Map	Notes
Normal random room	Yes	Yes		A common rectangular room.
Fake Delphi	Yes	Yes		A 11×9 room with a 3×3 room in its center, imitating Delphi.
Room in a room	Yes	Yes		A random room with a random subroom
Huge room	Yes	Yes		A very large room, with a 90% chance of containing a subroom.
Ice room	No	Yes		The floor is replaced with ice. 25% of the time, the ice melts under 2000 turns after the level is generated.
Boulder room	No	No		Each floor space in the room has a 30% chance of having a boulder or rolling boulder trap. These cannot appear before level difficulty 4.
Spider nest	No	No		Each floor space in the room has a 30% chance of having a web. If the level difficulty is at least 9, about 80% of the webs will have a giant spider sitting on them.
Trap room	No	No		Each floor space in the room has a 30% chance of having a trap. All of these traps will be of the same type, and they may have corpses and possessions on an eligible level. They can be arrow traps, dart traps, falling rock traps, bear traps, land mines, sleeping gas traps, rust traps or anti-magic fields.
Buried treasure	Yes	Yes		There is a chest buried in the floor, containing 3d4 random objects. A burned engraving pointing to the treasure ("Dig X east/west Y north/south") is also placed on a random floor space on the level.
Massacre	No	No		There are 5d5 player monster or quest guardian corpses on the floor.
Pillars	No	No	------------ |..........| |..........| |..--..--..| |..--..--..| |..........| |..........| |..--..--..| |..--..--..| |..........| |..........| ------------	The pillars will be lava 1⁄7 of the time, water 1⁄7 of the time, or trees 1⁄7 of the time.
Statuary	No	No		There are 5d5 statues and d3 statue traps.
Light source	No	No		The room is always dark, containing a lit oil lamp.
Temple of the gods	No	No		There is an altar of each alignment. The room is not an actual temple and does not contain a priest.
Ghost of an Adventurer	No	No		One space in the room contains a ghost atop a fake bones pile consisting of the following, all of which are either cursed or uncursed: 65% chance of a dagger 55% chance of a random weapon 45% chance of a bow and arrow 65% chance of a random piece of armor 20% chance of a random ring 20% chance of a random scroll
Mausoleum	No	No		A square room with a 3×3 subroom in the center. There is a 50% chance that there will be a lich, demilich, mummy, vampire or zombie sealed and waiting for you in the center of the room; otherwise there will be a @ corpse. There is a 20% chance that the center will have a secret door; beware.
Random dungeon feature	No	Yes		At the center of the room is a cloud, lava, ice, water, or a tree. The room will always have an odd width and height so that there is an exact center point.
L-shaped	Yes	Yes	-----    |...|    |...|    |...---- |......| |......| |......| --------	This room may appear rotated.
Blocked center	Yes	Yes	----------- |.........| |.........| |.........| |...}}}...| |...}}}...| |...}}}...| |.........| |.........| |.........| -----------	A 9×9 room with the central 3×3 spaces filled with lava (70% chance), walls (15% chance) or water (15% chance).
Circular, small	Yes	Yes	---    --.--  --...-- |.....| --...--  --.--    ---
Circular, medium	Yes	Yes	-----    --...--  --.....-- |.......| |.......| |.......| --.....--  --...--    -----
Circular, big	Yes	Yes	-----     ---...---   -.......-  --.......-- |.........| |.........| |.........| --.......--  -.......-   ---...---     -----
T-shaped	Yes	Yes	-----       |...|       |...|    ----...---- |.........| |.........| |.........| -----------	This room may appear rotated.
S-shaped	Yes	Yes	--------    |......|    |......| ----......| |......---- |......| |......| --------	This room may appear rotated or reflected.
Cross	Yes	Yes	-----       |...|       |...|    ----...---- |.........| |.........| |.........| ----...----    |...|       |...|       -----
Four-leaf clover	Yes	Yes	----- ----- |...| |...| |...---...| |.........| ---.....---   |.....|   ---.....--- |.........| |...---...| |...| |...| ----- -----
Water-surrounded vault	No	No	}}}}}} }----} }|((|} }|((|} }----} }}}}}}	The room is not connected to the other rooms, but may appear adjacent to a corridor. It can generate alongside an actual vault. It contains a giant zombie, ettin zombie, or vampire lord guarding four chests.
Twin businesses	No	No		The room contains two 3×3 (interior space) shop subrooms, consisting of a weapon shop and an armor shop. Each has a 1% chance of being locked. These cannot appear before level difficulty 4, but can appear on a floor which also has a normal shop, as well as on rooms-and-corridors levels below Medusa's island.

Variants

xNetHack

xNetHack uses a similar lineup of themed rooms to the one listed above, along with some rooms adapted from UnNetHack and new rooms that are original to the variant.