Monster Room

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Monster Room

👁 Monster Room (Dungeon).png: Infobox image for Minecraft structure 'Monster Room'

Biomes	All biomes in the Overworld
Mobs	👁 Image Zombie (from monster spawner) 👁 Image Skeleton (from monster spawner) 👁 Image Spider (from monster spawner)
Generates in existing chunks	No
Consists of	👁 BlockSprite cobblestone.png: Sprite image for cobblestone in Minecraft Cobblestone 👁 BlockSprite mossy-cobblestone.png: Sprite image for mossy-cobblestone in Minecraft Mossy cobblestone 👁 BlockSprite monster-spawner.png: Sprite image for monster-spawner in Minecraft Monster spawner 👁 BlockSprite chest.png: Sprite image for chest in Minecraft Loot chest

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 "field": "All biomes in the Overworld",
 "label": "(link to Biome article, displayed as Biomes)"
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 {
 "field": "(values exceeds 1000 characters...)",
 "label": "(link to Mob article, displayed as Mobs)"
 },
 {
 "field": "No",
 "label": "Generates in<br>existing chunks  "
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 "label": "Consists of"
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 "images": [
 "Monster Room (Dungeon).png"
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👁 Image
There is a related tutorial page for this topic!

See Tutorial:Defeating a monster room.

A monster room, commonly known as a dungeon,^{[note 1]} is a structure-like feature found underground in the Overworld. It consists of a room with cobblestone walls and a floor made of cobblestone mixed with mossy cobblestone. A monster spawner that produces either zombies, skeletons, or spiders is found in the middle.

Generation

[edit | edit source]

Monster rooms generate uncommonly in the Overworld in any biome and always nearby carver caves, canyons, 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. In Bedrock Edition, 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.^[1] They also cannot be searched by the /locate command,^[2] but they are very common and can be found without much difficulty in Spectator mode.

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 solid.
Blocks in the ceiling area (including over the walls) of the potential monster room must be 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 carver cave 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, and a 25% chance of producing spiders. A zombie monster spawner in Bedrock Edition 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.

The command /place feature minecraft:monster_room ~ ~ ~ can be used to generate a monster room only when the player is under the specific location where the monster room could be found naturally.

On certain Bedrock Edition platforms,^{[more information needed]} it may not be possible to generate monster rooms using this command.^[verify]

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Construction

[edit | edit source]

Main article: Monster Room/Structure

Monster rooms are small rooms made of cobblestone and mossy cobblestone that 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, 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

[edit | edit source]

👁 Image

An example of monster room chest loot in Java Edition.

See also: Chest loot

In Java Edition and Bedrock Edition, each monster room chest contains items drawn from 3 pools, with the following distribution:

Item	Stack Size ^[A]			Weight ^[B]			Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Item	1–3×	1–4×	3×	1–3×	1–4×	3×	Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
👁 Image Bone	—	—	1–8	—	—	¹⁰⁄₄₀	57.8%	3.375	1.7
👁 Image Gunpowder	—	—	1–8	—	—	¹⁰⁄₄₀	57.8%	3.375	1.7
👁 Image Rotten Flesh	—	—	1–8	—	—	¹⁰⁄₄₀	57.8%	3.375	1.7
👁 Image String	—	—	1–8	—	—	¹⁰⁄₄₀	57.8%	3.375	1.7
👁 Image Wheat	—	1–4	—	—	²⁰⁄₁₂₅	—	34.1%	1.000	2.9
👁 Image Bread	—	1	—	—	²⁰⁄₁₂₅	—	34.1%	0.400	2.9
👁 Image Coal	—	1–4	—	—	¹⁵⁄₁₂₅	—	26.6%	0.750	3.8
👁 Image Redstone Dust	—	1–4	—	—	¹⁵⁄₁₂₅	—	26.6%	0.750	3.8
👁 Image Leather	1–5	—	—	²⁰⁄₁₄₄	—	—	25.3%	0.833	4.0
👁 Image Name Tag	1	—	—	²⁰⁄₁₄₄	—	—	25.3%	0.278	4.0
👁 Image Copper Horse Armor	1	—	—	¹⁵⁄₁₄₄	—	—	19.4%	0.208	5.1
👁 Image Music Disc (13)	1	—	—	¹⁵⁄₁₄₄	—	—	19.4%	0.208	5.1
👁 Image Music Disc (cat)	1	—	—	¹⁵⁄₁₄₄	—	—	19.4%	0.208	5.1
👁 Image Iron Horse Armor	1	—	—	¹⁵⁄₁₄₄	—	—	19.4%	0.208	5.1
👁 Image Golden Apple	1	—	—	¹⁵⁄₁₄₄	—	—	19.4%	0.208	5.1
👁 Image Beetroot Seeds	—	2–4	—	—	¹⁰⁄₁₂₅	—	18.5%	0.600	5.4
👁 Image Melon Seeds	—	2–4	—	—	¹⁰⁄₁₂₅	—	18.5%	0.600	5.4
👁 Image Pumpkin Seeds	—	2–4	—	—	¹⁰⁄₁₂₅	—	18.5%	0.600	5.4
👁 Image Iron Ingot	—	1–4	—	—	¹⁰⁄₁₂₅	—	18.5%	0.500	5.4
👁 Image Bucket	—	1	—	—	¹⁰⁄₁₂₅	—	18.5%	0.200	5.4
👁 Image Enchanted Book^[F]	1	—	—	¹⁰⁄₁₄₄	—	—	13.3%	0.139	7.5
👁 Image Golden Horse Armor	1	—	—	¹⁰⁄₁₄₄	—	—	13.3%	0.139	7.5
👁 Image Gold Ingot	—	1–4	—	—	⁵⁄₁₂₅	—	9.6%	0.250	10.4
👁 Image Diamond Horse Armor	1	—	—	⁵⁄₁₄₄	—	—	6.8%	0.069	14.7
👁 Image Music Disc (otherside)	1	—	—	²⁄₁₄₄	—	—	2.8%	0.028	36.3
👁 Image Enchanted Golden Apple	1	—	—	²⁄₁₄₄	—	—	2.8%	0.028	36.3

{ "chestNames": [ "monster room" ], "gameVersion": "Java", "loot": { "monster room": { "poolsJava": [ { "items": { "copper-horse-armor": [ 1, 1, 15 ], "name-tag": [ 1, 1, 20 ], "disc-otherside": [ 1, 1, 2 ], "golden-apple": [ 1, 1, 15 ], "leather": [ 1, 5, 20 ], "enchanted-book-rnd": [ 1, 1, 10 ], "iron-horse-armor": [ 1, 1, 15 ], "diamond-horse-armor": [ 1, 1, 5 ], "enchanted-golden-apple": [ 1, 1, 2 ], "golden-horse-armor": [ 1, 1, 10 ], "disc-cat": [ 1, 1, 15 ], "disc-13": [ 1, 1, 15 ] }, "rolls": [ 1, 3 ], "totalweight": 144 }, { "items": { "wheat": [ 1, 4, 20 ], "melon-seeds": [ 2, 4, 10 ], "gold-ingot": [ 1, 4, 5 ], "bucket": [ 1, 1, 10 ], "beetroot-seeds": [ 2, 4, 10 ], "pumpkin-seeds": [ 2, 4, 10 ], "redstone": [ 1, 4, 15 ], "iron-ingot": [ 1, 4, 10 ], "coal": [ 1, 4, 15 ], "bread": [ 1, 1, 20 ] }, "rolls": [ 1, 4 ], "totalweight": 125 }, { "items": { "rotten-flesh": [ 1, 8, 10 ], "string": [ 1, 8, 10 ], "gunpowder": [ 1, 8, 10 ], "bone": [ 1, 8, 10 ] }, "rolls": [ 3, 3 ], "totalweight": 40 } ], "poolsBedrockUpcoming": [], "itemDataJava": { "wheat": { "itemname": "wheat", "sizes": [ "—", "1–4", "—" ], "sortsize": [ 0, 2.5, 0 ], "sortweight": [ 0, 20, 0 ], "weights": [ "—", "<sup>20</sup>&frasl;<sub>125</sub>", "—" ], "avgamount": 1, "chanceany": 0.34095616000000006 }, "melon-seeds": { "sortsize": [ 0, 3, 0 ], "weights": [ "—", "<sup>10</sup>&frasl;<sub>125</sub>", "—" ], "chanceany": 0.1846297600000001, "sizes": [ "—", "2–4", "—" ], "sortweight": [ 0, 10, 0 ], "armor": 0, "material": 0, "avgamount": 0.6, "itemname": "melon-seeds" }, "diamond-horse-armor": { "itemname": "diamond-horse-armor", "sizes": [ 1, "—", "—" ], "sortsize": [ 1, 0, 0 ], "sortweight": [ 5, 0, 0 ], "weights": [ "<sup>5</sup>&frasl;<sub>144</sub>", "—", "—" ], "avgamount": 0.06944444444444445, "chanceany": 0.0678508882387403 }, "rotten-flesh": { "sortsize": [ 0, 0, 4.5 ], "weights": [ "—", "—", "<sup>10</sup>&frasl;<sub>40</sub>" ], "chanceany": 0.578125, "sizes": [ "—", "—", "1–8" ], "sortweight": [ 0, 0, 10 ], "armor": 0, "material": 0, "avgamount": 3.375, "itemname": "rotten-flesh" }, "disc-otherside": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>2</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.027521469192958392, "sizes": [ 1, "—", "—" ], "sortweight": [ 2, 0, 0 ], "armor": 0, "material": 0, "avgamount": 0.027777777777777776, "itemname": "disc-otherside" }, "gold-ingot": { "itemname": "gold-ingot", "sizes": [ "—", "1–4", "—" ], "sortsize": [ 0, 2.5, 0 ], "sortweight": [ 0, 5, 0 ], "weights": [ "—", "<sup>5</sup>&frasl;<sub>125</sub>", "—" ], "avgamount": 0.25, "chanceany": 0.09607936000000006 }, "iron-horse-armor": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>15</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.19424250096450613, "sizes": [ 1, "—", "—" ], "sortweight": [ 15, 0, 0 ], "armor": 0, "material": 2, "avgamount": 0.20833333333333334, "itemname": "iron-horse-armor" }, "bone": { "sortsize": [ 0, 0, 4.5 ], "weights": [ "—", "—", "<sup>10</sup>&frasl;<sub>40</sub>" ], "chanceany": 0.578125, "sizes": [ "—", "—", "1–8" ], "sortweight": [ 0, 0, 10 ], "armor": 0, "material": 0, "avgamount": 3.375, "itemname": "bone" }, "enchanted-golden-apple": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>2</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.027521469192958392, "sizes": [ 1, "—", "—" ], "sortweight": [ 2, 0, 0 ], "armor": 0, "material": 3, "avgamount": 0.027777777777777776, "itemname": "enchanted-golden-apple" }, "pumpkin-seeds": { "sortsize": [ 0, 3, 0 ], "weights": [ "—", "<sup>10</sup>&frasl;<sub>125</sub>", "—" ], "chanceany": 0.1846297600000001, "sizes": [ "—", "2–4", "—" ], "sortweight": [ 0, 10, 0 ], "armor": 0, "material": 0, "avgamount": 0.6, "itemname": "pumpkin-seeds" }, "gunpowder": { "sortsize": [ 0, 0, 4.5 ], "weights": [ "—", "—", "<sup>10</sup>&frasl;<sub>40</sub>" ], "chanceany": 0.578125, "sizes": [ "—", "—", "1–8" ], "sortweight": [ 0, 0, 10 ], "armor": 0, "material": 0, "avgamount": 3.375, "itemname": "gunpowder" }, "string": { "sortsize": [ 0, 0, 4.5 ], "weights": [ "—", "—", "<sup>10</sup>&frasl;<sub>40</sub>" ], "chanceany": 0.578125, "sizes": [ "—", "—", "1–8" ], "sortweight": [ 0, 0, 10 ], "armor": 0, "material": 0, "avgamount": 3.375, "itemname": "string" }, "copper-horse-armor": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>15</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.19424250096450613, "sizes": [ 1, "—", "—" ], "sortweight": [ 15, 0, 0 ], "armor": 0, "material": 0, "avgamount": 0.20833333333333334, "itemname": "copper-horse-armor" }, "bread": { "itemname": "bread", "sizes": [ "—", 1, "—" ], "sortsize": [ 0, 1, 0 ], "sortweight": [ 0, 20, 0 ], "weights": [ "—", "<sup>20</sup>&frasl;<sub>125</sub>", "—" ], "avgamount": 0.4, "chanceany": 0.34095616000000006 }, "enchanted-book-rnd": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>10</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.132570480395519, "sizes": [ 1, "—", "—" ], "sortweight": [ 10, 0, 0 ], "armor": 0, "material": 0, "avgamount": 0.1388888888888889, "itemname": "enchanted-book-rnd" }, "coal": { "sortsize": [ 0, 2.5, 0 ], "weights": [ "—", "<sup>15</sup>&frasl;<sub>125</sub>", "—" ], "chanceany": 0.26610816000000004, "sizes": [ "—", "1–4", "—" ], "sortweight": [ 0, 15, 0 ], "armor": 0, "material": 0, "avgamount": 0.75, "itemname": "coal" }, "golden-apple": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>15</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.19424250096450613, "sizes": [ 1, "—", "—" ], "sortweight": [ 15, 0, 0 ], "armor": 0, "material": 3, "avgamount": 0.20833333333333334, "itemname": "golden-apple" }, "iron-ingot": { "itemname": "iron-ingot", "sizes": [ "—", "1–4", "—" ], "sortsize": [ 0, 2.5, 0 ], "sortweight": [ 0, 10, 0 ], "weights": [ "—", "<sup>10</sup>&frasl;<sub>125</sub>", "—" ], "avgamount": 0.5, "chanceany": 0.1846297600000001 }, "leather": { "itemname": "leather", "sizes": [ "1–5", "—", "—" ], "sortsize": [ 3, 0, 0 ], "sortweight": [ 20, 0, 0 ], "weights": [ "<sup>20</sup>&frasl;<sub>144</sub>", "—", "—" ], "avgamount": 0.8333333333333334, "chanceany": 0.25295067443987196 }, "bucket": { "itemname": "bucket", "sizes": [ "—", 1, "—" ], "sortsize": [ 0, 1, 0 ], "sortweight": [ 0, 10, 0 ], "weights": [ "—", "<sup>10</sup>&frasl;<sub>125</sub>", "—" ], "avgamount": 0.2, "chanceany": 0.1846297600000001 }, "name-tag": { "itemname": "name-tag", "sizes": [ 1, "—", "—" ], "sortsize": [ 1, 0, 0 ], "sortweight": [ 20, 0, 0 ], "weights": [ "<sup>20</sup>&frasl;<sub>144</sub>", "—", "—" ], "avgamount": 0.2777777777777778, "chanceany": 0.25295067443987196 }, "beetroot-seeds": { "sortsize": [ 0, 3, 0 ], "weights": [ "—", "<sup>10</sup>&frasl;<sub>125</sub>", "—" ], "chanceany": 0.1846297600000001, "sizes": [ "—", "2–4", "—" ], "sortweight": [ 0, 10, 0 ], "armor": 0, "material": 0, "avgamount": 0.6, "itemname": "beetroot-seeds" }, "redstone": { "sortsize": [ 0, 2.5, 0 ], "weights": [ "—", "<sup>15</sup>&frasl;<sub>125</sub>", "—" ], "chanceany": 0.26610816000000004, "sizes": [ "—", "1–4", "—" ], "sortweight": [ 0, 15, 0 ], "armor": 0, "material": 0, "avgamount": 0.75, "itemname": "redstone" }, "golden-horse-armor": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>10</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.132570480395519, "sizes": [ 1, "—", "—" ], "sortweight": [ 10, 0, 0 ], "armor": 0, "material": 3, "avgamount": 0.1388888888888889, "itemname": "golden-horse-armor" }, "disc-cat": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>15</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.19424250096450613, "sizes": [ 1, "—", "—" ], "sortweight": [ 15, 0, 0 ], "armor": 0, "material": 0, "avgamount": 0.20833333333333334, "itemname": "disc-cat" }, "disc-13": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>15</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.19424250096450613, "sizes": [ 1, "—", "—" ], "sortweight": [ 15, 0, 0 ], "armor": 0, "material": 0, "avgamount": 0.20833333333333334, "itemname": "disc-13" } }, "structID": "Monster Room", "poolsJavaUpcoming": [], "structure": "Monster Room", "container": "", "itemDataJavaUpcoming": [], "allRollsJavaUpcoming": [], "itemDataBedrock": { "wheat": { "itemname": "wheat", "sizes": [ "—", "1–4", "—" ], "sortsize": [ 0, 2.5, 0 ], "sortweight": [ 0, 20, 0 ], "weights": [ "—", "<sup>20</sup>&frasl;<sub>125</sub>", "—" ], "avgamount": 1, "chanceany": 0.34095616000000006 }, "melon-seeds": { "sortsize": [ 0, 3, 0 ], "weights": [ "—", "<sup>10</sup>&frasl;<sub>125</sub>", "—" ], "chanceany": 0.1846297600000001, "sizes": [ "—", "2–4", "—" ], "sortweight": [ 0, 10, 0 ], "armor": 0, "material": 0, "avgamount": 0.6, "itemname": "melon-seeds" }, "diamond-horse-armor": { "itemname": "diamond-horse-armor", "sizes": [ 1, "—", "—" ], "sortsize": [ 1, 0, 0 ], "sortweight": [ 5, 0, 0 ], "weights": [ "<sup>5</sup>&frasl;<sub>144</sub>", "—", "—" ], "avgamount": 0.06944444444444445, "chanceany": 0.0678508882387403 }, "rotten-flesh": { "sortsize": [ 0, 0, 4.5 ], "weights": [ "—", "—", "<sup>10</sup>&frasl;<sub>40</sub>" ], "chanceany": 0.578125, "sizes": [ "—", "—", "1–8" ], "sortweight": [ 0, 0, 10 ], "armor": 0, "material": 0, "avgamount": 3.375, "itemname": "rotten-flesh" }, "disc-otherside": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>2</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.027521469192958392, "sizes": [ 1, "—", "—" ], "sortweight": [ 2, 0, 0 ], "armor": 0, "material": 0, "avgamount": 0.027777777777777776, "itemname": "disc-otherside" }, "gold-ingot": { "itemname": "gold-ingot", "sizes": [ "—", "1–4", "—" ], "sortsize": [ 0, 2.5, 0 ], "sortweight": [ 0, 5, 0 ], "weights": [ "—", "<sup>5</sup>&frasl;<sub>125</sub>", "—" ], "avgamount": 0.25, "chanceany": 0.09607936000000006 }, "iron-horse-armor": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>15</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.19424250096450613, "sizes": [ 1, "—", "—" ], "sortweight": [ 15, 0, 0 ], "armor": 0, "material": 2, "avgamount": 0.20833333333333334, "itemname": "iron-horse-armor" }, "bone": { "sortsize": [ 0, 0, 4.5 ], "weights": [ "—", "—", "<sup>10</sup>&frasl;<sub>40</sub>" ], "chanceany": 0.578125, "sizes": [ "—", "—", "1–8" ], "sortweight": [ 0, 0, 10 ], "armor": 0, "material": 0, "avgamount": 3.375, "itemname": "bone" }, "enchanted-golden-apple": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>2</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.027521469192958392, "sizes": [ 1, "—", "—" ], "sortweight": [ 2, 0, 0 ], "armor": 0, "material": 3, "avgamount": 0.027777777777777776, "itemname": "enchanted-golden-apple" }, "pumpkin-seeds": { "sortsize": [ 0, 3, 0 ], "weights": [ "—", "<sup>10</sup>&frasl;<sub>125</sub>", "—" ], "chanceany": 0.1846297600000001, "sizes": [ "—", "2–4", "—" ], "sortweight": [ 0, 10, 0 ], "armor": 0, "material": 0, "avgamount": 0.6, "itemname": "pumpkin-seeds" }, "gunpowder": { "sortsize": [ 0, 0, 4.5 ], "weights": [ "—", "—", "<sup>10</sup>&frasl;<sub>40</sub>" ], "chanceany": 0.578125, "sizes": [ "—", "—", "1–8" ], "sortweight": [ 0, 0, 10 ], "armor": 0, "material": 0, "avgamount": 3.375, "itemname": "gunpowder" }, "string": { "sortsize": [ 0, 0, 4.5 ], "weights": [ "—", "—", "<sup>10</sup>&frasl;<sub>40</sub>" ], "chanceany": 0.578125, "sizes": [ "—", "—", "1–8" ], "sortweight": [ 0, 0, 10 ], "armor": 0, "material": 0, "avgamount": 3.375, "itemname": "string" }, "copper-horse-armor": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>15</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.19424250096450613, "sizes": [ 1, "—", "—" ], "sortweight": [ 15, 0, 0 ], "armor": 0, "material": 0, "avgamount": 0.20833333333333334, "itemname": "copper-horse-armor" }, "bread": { "itemname": "bread", "sizes": [ "—", 1, "—" ], "sortsize": [ 0, 1, 0 ], "sortweight": [ 0, 20, 0 ], "weights": [ "—", "<sup>20</sup>&frasl;<sub>125</sub>", "—" ], "avgamount": 0.4, "chanceany": 0.34095616000000006 }, "enchanted-book-rnd": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>10</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.132570480395519, "sizes": [ 1, "—", "—" ], "sortweight": [ 10, 0, 0 ], "armor": 0, "material": 0, "avgamount": 0.1388888888888889, "itemname": "enchanted-book-rnd" }, "coal": { "sortsize": [ 0, 2.5, 0 ], "weights": [ "—", "<sup>15</sup>&frasl;<sub>125</sub>", "—" ], "chanceany": 0.26610816000000004, "sizes": [ "—", "1–4", "—" ], "sortweight": [ 0, 15, 0 ], "armor": 0, "material": 0, "avgamount": 0.75, "itemname": "coal" }, "golden-apple": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>15</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.19424250096450613, "sizes": [ 1, "—", "—" ], "sortweight": [ 15, 0, 0 ], "armor": 0, "material": 3, "avgamount": 0.20833333333333334, "itemname": "golden-apple" }, "iron-ingot": { "itemname": "iron-ingot", "sizes": [ "—", "1–4", "—" ], "sortsize": [ 0, 2.5, 0 ], "sortweight": [ 0, 10, 0 ], "weights": [ "—", "<sup>10</sup>&frasl;<sub>125</sub>", "—" ], "avgamount": 0.5, "chanceany": 0.1846297600000001 }, "leather": { "itemname": "leather", "sizes": [ "1–5", "—", "—" ], "sortsize": [ 3, 0, 0 ], "sortweight": [ 20, 0, 0 ], "weights": [ "<sup>20</sup>&frasl;<sub>144</sub>", "—", "—" ], "avgamount": 0.8333333333333334, "chanceany": 0.25295067443987196 }, "bucket": { "itemname": "bucket", "sizes": [ "—", 1, "—" ], "sortsize": [ 0, 1, 0 ], "sortweight": [ 0, 10, 0 ], "weights": [ "—", "<sup>10</sup>&frasl;<sub>125</sub>", "—" ], "avgamount": 0.2, "chanceany": 0.1846297600000001 }, "name-tag": { "itemname": "name-tag", "sizes": [ 1, "—", "—" ], "sortsize": [ 1, 0, 0 ], "sortweight": [ 20, 0, 0 ], "weights": [ "<sup>20</sup>&frasl;<sub>144</sub>", "—", "—" ], "avgamount": 0.2777777777777778, "chanceany": 0.25295067443987196 }, "beetroot-seeds": { "sortsize": [ 0, 3, 0 ], "weights": [ "—", "<sup>10</sup>&frasl;<sub>125</sub>", "—" ], "chanceany": 0.1846297600000001, "sizes": [ "—", "2–4", "—" ], "sortweight": [ 0, 10, 0 ], "armor": 0, "material": 0, "avgamount": 0.6, "itemname": "beetroot-seeds" }, "redstone": { "sortsize": [ 0, 2.5, 0 ], "weights": [ "—", "<sup>15</sup>&frasl;<sub>125</sub>", "—" ], "chanceany": 0.26610816000000004, "sizes": [ "—", "1–4", "—" ], "sortweight": [ 0, 15, 0 ], "armor": 0, "material": 0, "avgamount": 0.75, "itemname": "redstone" }, "golden-horse-armor": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>10</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.132570480395519, "sizes": [ 1, "—", "—" ], "sortweight": [ 10, 0, 0 ], "armor": 0, "material": 3, "avgamount": 0.1388888888888889, "itemname": "golden-horse-armor" }, "disc-cat": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>15</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.19424250096450613, "sizes": [ 1, "—", "—" ], "sortweight": [ 15, 0, 0 ], "armor": 0, "material": 0, "avgamount": 0.20833333333333334, "itemname": "disc-cat" }, "disc-13": { "sortsize": [ 1, 0, 0 ], "weights": [ "<sup>15</sup>&frasl;<sub>144</sub>", "—", "—" ], "chanceany": 0.19424250096450613, "sizes": [ 1, "—", "—" ], "sortweight": [ 15, 0, 0 ], "armor": 0, "material": 0, "avgamount": 0.20833333333333334, "itemname": "disc-13" } }, "poolsBedrock": [ { "items": { "copper-horse-armor": [ 1, 1, 15 ], "name-tag": [ 1, 1, 20 ], "disc-otherside": [ 1, 1, 2 ], "golden-apple": [ 1, 1, 15 ], "leather": [ 1, 5, 20 ], "enchanted-book-rnd": [ 1, 1, 10 ], "iron-horse-armor": [ 1, 1, 15 ], "diamond-horse-armor": [ 1, 1, 5 ], "enchanted-golden-apple": [ 1, 1, 2 ], "golden-horse-armor": [ 1, 1, 10 ], "disc-cat": [ 1, 1, 15 ], "disc-13": [ 1, 1, 15 ] }, "rolls": [ 1, 3 ], "totalweight": 144 }, { "items": { "wheat": [ 1, 4, 20 ], "melon-seeds": [ 2, 4, 10 ], "gold-ingot": [ 1, 4, 5 ], "bucket": [ 1, 1, 10 ], "beetroot-seeds": [ 2, 4, 10 ], "pumpkin-seeds": [ 2, 4, 10 ], "redstone": [ 1, 4, 15 ], "iron-ingot": [ 1, 4, 10 ], "coal": [ 1, 4, 15 ], "bread": [ 1, 1, 20 ] }, "rolls": [ 1, 4 ], "totalweight": 125 }, { "items": { "rotten-flesh": [ 1, 8, 10 ], "string": [ 1, 8, 10 ], "gunpowder": [ 1, 8, 10 ], "bone": [ 1, 8, 10 ] }, "rolls": [ 3, 3 ], "totalweight": 40 } ], "allRollsBedrockUpcoming": [], "allRollsBedrock": [ "1–3", "1–4", 3 ], "itemDataBedrockUpcoming": [], "header": "[[Monster Room]]", "allRollsJava": [ "1–3", "1–4", 3 ], "link": "[[monster room]]" } } }

↑ The size of stacks (or for unstackable items, number) of this item on any given roll.
↑ The weight of this item relative to other items in the pool.
↑ The odds of finding any of this item in a single chest.
↑ The number of items expected per chest, averaged over a large number of chests.
↑ The average number of chests the player should expect to search to find any of this item.
↑ All enchantments are equally probable, including treasure enchantments (except Soul Speed, Swift Sneak, and Wind Burst), and any level of the enchantment is equally probable.

Data values

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ID

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Java Edition:

Feature type	Identifier
👁 EnvSprite monster-room.png: Sprite image for monster-room in Minecraft [No displayed name]	`monster_room`

Configured feature	Identifier
👁 EnvSprite monster-room.png: Sprite image for monster-room in Minecraft [No displayed name]	`monster_room`

Bedrock Edition:

Feature	Identifier
👁 EnvSprite monster-room.png: Sprite image for monster-room in Minecraft [No displayed name]	`[No ID]`

Config

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Main article: Configured feature

Java Edition:

[NBT Compound / JSON Object] config: Empty

An example

{
"type":"minecraft:monster_room",
"config":{}
}

History

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Java Edition

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Java Edition Infdev
20100625-1917		👁 Image Added monster rooms. The chests may contain sulphur, string, wheat, bread, iron ingots, buckets, saddles and rarely golden apples.
Java Edition Alpha
v1.0.1_01		Added redstone dust to monster room chests.^{[is this the correct version?]}
v1.0.14		Added the newly introduced 13 and cat music discs to monster room chests.
Java Edition Beta
1.4		Added cocoa beans to monster room chests.
Java Edition
1.4.6	12w49a	Added enchanted books to monster room chests.
1.6.1	13w16b	Added name tags to monster room chests.
1.6.1	13w18a	Added horse armor to monster room chests and removed cocoa beans. Probabilities have now also been adjusted.
1.7.2	13w36a	Changes in carver cave generation now make monster rooms considerably rarer.^[3]
1.8	14w30a	The chances of music discs in monster room chests have been reduced.
1.9	15w44a	Added bones, coal, rotten flesh, enchanted golden apples, melon slices, pumpkins and beetroot seeds to monster room chests.
		The average yield of music discs in monster room chests has been increased.
		The average yield of enchanted books, gunpowder and string in monster room chests have been doubled.
		The average yield of normal golden apples in monster room chests has been substantially increased.
		The average yield of iron horse armor in monster room chests has been decreased.
		The average yields of name tags, saddles, wheat and bread in monster room chests have been nearly halved.
		The average yields of iron ingots and buckets in monster room chests have been substantially decreased.
1.16	20w22a	As a result of a world generation bug fix, monster room positions have been shifted.
1.17	?	Monster room generation has changed – it appears they are again capable of generating in open-air areas such as cliffsides like they were prior to 1.7.2.
1.18	21w40a	Monster rooms now generate more frequently, especially below Y=0.
1.18	21w42a	The "otherside" music disc can now be found in monster room chests.
1.18.2	22w03a	Monster rooms can now be placed using `/placefeature`.
1.19	22w18a	Due to the removal of `/placefeature` command, monster rooms are now placed using `/place`.
1.19.4	23w05a	Removed mentioning of monster rooms from the Create New World screen. Before this snapshot, a contradiction existed in Java Edition that even though the "Generate Structures" world creation option listed "dungeons" as an example structures that were supposed to generate only when the option was turned "ON", monster rooms generated even if the option was set to "OFF".
1.21.6	25w20a	Removed saddles from loot tables, replaced with 1–5 leather.
1.21.9	25w31a	Copper horse armor now generates in monster room chests.

Bedrock Edition

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Pocket Edition Alpha
v0.9.0	build 1	Added dungeons.
v0.15.0	build 1	Added name tags, enchanted books and horse armor to dungeon chests.
Bedrock Edition
1.2.0	beta 1.2.0.2	Added music discs to dungeon chests.
1.17.0	?	The probability of dungeons had been changed to less common to match Java Edition.
1.18.0	beta 1.18.0.21	Dungeons now generate more frequently, especially below Y=0.

Legacy Console Edition

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Legacy Console Edition
Xbox 360	Xbox One	PS3	PS4	PS Vita	Wii U	Switch
TU1	CU1	1.00	1.00	1.00	Patch 1	1.0.1	Added dungeons.

New Nintendo 3DS Edition

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New Nintendo 3DS Edition
0.1.0							Added dungeons.

Issues

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Issues relating to "Monster Room" or "Dungeon" are maintained on the bug tracker. Issues should be reported and viewed there.

Gallery

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Notes

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↑ This name is still used to describe it in official media.^{[citation needed]}

References

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↑ MC-77787 – Dungeons still generate when generate structures option is turned off – resolved as "Won't Fix".
↑ MC-107829 – resolved as "Works As Intended".
↑ "It seems that the underground is no longer swiss cheese anymore." by TheMasterCaver – Minecraft Forum, October 26, 2013. "Dungeons require an air space underground in order to generate, so fewer caves = fewer chances of a dungeon generating"

External links

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"Building Blocks: Monster Room" by Duncan Geere – Minecraft.net, February 26, 2026.

Navigation

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World features

👁 EnvSprite hoodoo.png: Sprite image for hoodoo in Minecraft
Terrain features

👁 Image
Overworld

Terrain	👁 Image Canyon 👁 Image Carver cave 👁 Image Cliff 👁 Image Floating island 👁 Image Hill 👁 Image Mountains 👁 Image Noise cave
Surface	👁 Image Surface layers 👁 Image Erosion 👁 Image Slopes Strip 👁 Image Terracotta 👁 Image Marshland 👁 Image Hoodoo 👁 Image Iceberg
Water bodies	👁 Image Aquifer 👁 Image Sea level 👁 Image Ocean 👁 Image River
Others	👁 Image Ore vein

👁 Image
The Nether

👁 Image
The End

Removed

Java Edition only	👁 Image Monolith

👁 EnvSprite mineshaft.png: Sprite image for mineshaft in Minecraft
Structures

👁 Image
Overworld

👁 Image
Ruined Portal

Surface	👁 Image Desert Pyramid 👁 Image Igloo 👁 Image Jungle Pyramid 👁 Image Pillager Outpost 👁 Image Swamp Hut 👁 Image Village 👁 Image Farm 👁 Image Woodland Mansion 👁 Image Abandoned Camp^{[upcoming: Third Drop 2026]}
Underwater	👁 Image Ocean Monument 👁 Image Ocean Ruins 👁 Image Shipwreck
Underground	👁 Image Ancient City 👁 Image Buried Treasure 👁 Image Mineshaft 👁 Image Stronghold 👁 Image Trail Ruins 👁 Image Trial Chambers