Themed room

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

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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.

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.

Room templates

Rooms can now be generated in the following shapes, including other special rooms and the themed rooms in the list below this one:

Name	Map	Notes
Normal random room		A common rectangular room.
Fake Delphi		A 11×9 room with a 3×3 room in its center, imitating Delphi.
Room in a room		A random room with a random subroom
Huge room		A very large room, with a 90% chance of containing a subroom.
L-shaped	-----    |...|    |...|    |...---- |......| |......| |......| --------	This room may appear rotated.
Blocked center	----------- |.........| |.........| |.........| |...}}}...| |...}}}...| |...}}}...| |.........| |.........| |.........| -----------	A 9×9 room with the central 3×3 spaces filled with lava (70% chance), walls (15% chance) or water (15% chance).
Circular, small	---    --.--  --...-- |.....| --...--  --.--    ---
Circular, medium	-----    --...--  --.....-- |.......| |.......| |.......| --.....--  --...--    -----
Circular, big	-----     ---...---   -.......-  --.......-- |.........| |.........| |.........| --.......--  -.......-   ---...---     -----
T-shaped	-----       |...|       |...|    ----...---- |.........| |.........| |.........| -----------	This room may appear rotated.
S-shaped	--------    |......|    |......| ----......| |......---- |......| |......| --------	This room may appear rotated or reflected.
Cross	-----       |...|       |...|    ----...---- |.........| |.........| |.........| ----...----    |...|       |...|       -----
Four-leaf clover	----- ----- |...| |...| |...---...| |.........| ---.....---   |.....|   ---.....--- |.........| |...---...| |...| |...| ----- -----

List of themed rooms

Name	Can be special	Normal room contents	Map	Notes
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		Per commit bb3dc379, this room has a chest containing 3d4 random objects buried in the floor. 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 replaced with 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.
Water-surrounded vault	No	No	}}}}}} }----} }|((|} }|((|} }----} }}}}}}	The room is not connected to the other rooms, but may appear adjacent to a corridor. It can generate on the same level as an actual vault, but it is not a real vault and cannot contain the portal to Fort Ludios. It contains a giant zombie, ettin zombie, or vampire lord guarding four chests. One of the chests is guaranteed to contain exactly one of the following escape items: a scroll, ring, or wand of teleportation, or a wand of digging.
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.
Storeroom	No	No		Per commit 37f6eee1, the storeroom is a normal room full of chests and mimics disguised as chests, with a 3⁄4 chance of each chest being a disguised mimic.
Garden	No	No		Per commit a429eed9, the room contains multiple sleeping wood nymphs with a 30% chance of a fountain. The walls of the room are replaced by trees.
Cloud room	No	No		This room is filled with clouds of vapor, and one quarter of the spaces contain a sleeping fog cloud.
Teleportation hub	No	No		This room contains no special terrain, objects, or monsters, but 2-4 teleportation traps will be created elsewhere in the level. Each of these traps is special and will send anyone who triggers it to the same location each time, somewhere inside this room.

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.