Monster Room

The monster room is a small building in the Overworld where a monster spawner that produces either zombies, skeletons or spiders is found in the middle of a room with cobblestone lateral walls and cobblestone mixed with mossy cobblestone floors.
== Generation ==
Monster rooms generate naturally in the Overworld terrain in any biome uncommonly and always nearby caves, ravines, underwater ravines, aquifers, abandoned mineshafts and strongholds. Each chunk has fourteen attempts to generate monster rooms underground within y-coordinates 0 to 320 or -58 to -1, each altitude range with different uniformity. For the higher altitude Y levels 0 to 320, up to 10 monster rooms can generate, while up to 4 monster rooms can generate in lower altitude Y levels -58 to -1. It is possible, though unlikely, for multiple attempts to succeed. , monster rooms can generate as underground structures above sea level.
Monster rooms are a feature instead of a structure, so they generate regardless of whether the "Generate structures" world creation option has been toggled off for said world. They also cannot be searched by the command.
For each attempt, a location (the position for monster spawner) and size (an open area with a width and length of 7 or 9 and a height of 6) is chosen. The attempt succeeds if the following conditions are met:
* Blocks in the floor area (including under the walls) of the potential monster room must be material solid.
* Blocks in the ceiling area (including over the walls) of the potential monster room must be material solid. The ceiling blocks may be gravity-affected such as gravel or sand, which fall if disturbed by the player.
* The walls of the potential monster room must have 1–5 openings (2-high air blocks) at floor level. Monster rooms are always connected to a cavern or other hollow structure, although it is possible for the monster room itself to overwrite most of a tiny cave.
If the location passes, air and cobblestone are placed, then 3 attempts are made to generate each of two chests. To generate a chest, the chosen block must be empty and must have a solid block on exactly one of its four sides. The monster spawner is placed at the center of the monster room.
The monster spawner has a 50% chance of producing zombies, a 25% chance of producing skeletons, or a 25% chance of producing spiders. A zombie monster spawner also has the same chance (5%) of producing zombie villagers as in natural generation.
 
Cobblestone has a 75% chance to be mossy when it is on the floor of the monster room.
You can use the command /place feature minecraft:monster_room ~ ~ ~ to generate a monster room only when you are under the specific location where the monster room could be found naturally.
== Construction ==
Monster rooms are small rooms made of cobblestone and mossy cobblestone and contain a monster spawner and up to 2 chests. Finding a monster room without a chest is unlikely but possible. Additionally, there is a rare chance of a monster room being found without a monster spawner. Occasionally, a monster room generates with its chests in such a way as to create a double chest. Monster rooms generate with either a zombie (50% chance), skeleton (25% chance), or spider (25% chance) monster spawner. The monster spawner is always in the center of the monster room room, with chests located around the walls of the room (large chests can connect with the short side against the wall). Each block of the floor has a 25% chance of being cobblestone and a 75% chance of being mossy cobblestone.
Because the horizontal range for spawning mobs is 4 blocks from the monster spawner, it is possible for mobs to be spawned outside the walls of a 5×5 monster room that is surrounded by air outside the walls.
== Loot ==
== Data values ==
=== ID ===
:
:
== History ==
== Issues ==
== Gallery ==
Gravel Covered Dungeon.png|A gravel ore feature fallen into a monster room.
DungeonInAir.png|A rare instance of a monster room generating in midair.
Dungeon2.png|A spider monster room.
Open Dungeon Chest.png|A chest in a monster room that is open, revealing loot.
Carrot Dungeon.jpg|A zombie monster room.
SpawnRoomLoot.png|Loot reveal.
Cave by a dungeon.png|A monster room next to a cave.
Skeleton spawner in badlands mineshaft.png|Skeleton monster spawner in badlands mineshaft.
Unarmed Skeletons.png|A monster room full of skeletons without bows.
Illuminated Dungeon.jpg|A dungeon with a torch.
Illuminated Zombie Dungeon.jpg|A dungeon with zombies.
=== Surface monster rooms ===
Sandy Dungeon.png|A caved in surface monster room.
Cliff Face Dungeon.png|A surface monster room.
Surface zombie dungeon.png|Monster rooms can rarely be found open to the surface.
Frozen Over Dungeon.png|A monster room found under a frozen ocean.
DungeonInWater.png|A monster room found in the water.
2 Surfece Dungens Next to each other.png|Two surface monster rooms right next to each other.
PCGDDungeon.png|A surface monster room in the PC Gamer Demo Edition.
OpenDungeon.png|Monster rooms generated underneath sand tend to cause cave-ins.
Zombie dungeon at ground level.png|A zombie monster room at ground level.
SurfaceDungeon.png|A monster room on the surface.
=== Multiple monster rooms ===
5 Dungeons.png|Five monster rooms and 2 cave spider monster spawners close together in a mineshaft, cleared to show all 7 monster spawners.
Two Spawners.png|A double monster room, the wall of the first acting as the entrance of the second.
DungeonWithThreeChests.png|A double monster room with three chests.
Triple Dungeon.png|A triple monster room.
Two-Floor Dungeon.png|Extremely rare double-decker monster room.
Duplicate Dungeon.png|A monster room in a monster room.
Triple Dungeon around the savanna village.png|Triple monster room around the village.
=== Odd generation ===
Dungeon With Mineshaft.png|A monster room intersecting with an abandoned mineshaft.
Dungeon-byEndPortalroom.png|A monster room found by an end portal room in a stronghold.
DungeonTemple.png|Monster room generated aside the chest chamber of the temple. One chest was overwritten by the monster room wall.
Dungeonintemple.png|A monster room distorted by a desert temple.
Dungeonsource.png|A monster room with lava spilling into it from a spring.
Imperfect dungeon.png|A monster room distorted by a cave system.
Dungeon waterfall.png|A monster room that has become flooded because of falling sand on the bottom of a river.
Igloo Basement Touchng The Dungeon.png|Igloo basement touching this monster room without 1 jail beside of the torch.
DungeonNearBedrock.png|A monster room intersecting with a mineshaft at bedrock level.
D.png|A monster room connected to a dead end of an abandoned mineshaft.
Flooded Dungeon.png|A monster room with a waterfall flowing into it.
Dungeon Picture.png|A monster room generating without the monster spawner and the chests in a desert temple.
Chestless Dungeon.png|A monster room with no chests.
Double-chest dungeon.png|A double chest monster room.
Dungeon plus mineshaft.png|A monster room intersecting a mineshaft.
Dungeon in Stronghold.png|A zombie monster room that generated in a stronghold.
3inone.png|A monster room, mineshaft and stronghold are in one area.
Floating dungeon.png|Floating monster room without a floor.
Dungeon chest on a geode.png|Monster room with a geode underneath it, causing the chest to generate on the top of smooth basalt.
Dungeon minecart chest.png|A monster room that spawned intersecting a mineshaft, where one of the chests has been replaced with a minecart chest.
NewDungeon1.9.png|A monster room next to a mineshaft.
DungeonAndMineshaft.png|Another monster room next to a mineshaft.
Spawner in mineshaft.png|Zombie monster room connected to a mineshaft.
Dungeon ancient city.png|A zombie monster room intersecting with an ancient city.
== References ==
== Notes ==
de:Verlies
es:Sala de monstruos
fr:Donjon
it:Segreta
ja:ダンジョン
ko:던전
nl:Kerker
pl:Lochy
pt:Masmorra
ru:Сокровищница
th:ดันเจี้ยน
uk:Скарбниця
zh:地牢