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m (Undo revision 1893896 by 81.103.152.177 (talk) - Reason: Non-wiki (see Notes; In rare cases, a fortress may not generate any indoor rooms except one single lava room, forcing the player to go to another fortress (or housing unit bastion) to find their first nether wart.))
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== Generation ==
 
== Generation ==
[[File:Java Nether Structure Generation1.png|thumb|300x300px|Nether structure generation {{in|Java}}.WHY ISNT NETHER WART IN ALL FORTRESSES???!!! The black lines represent each region and the dots represent coordinates. Green is where they can generate and red is where they cannot.]]
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[[File:Java Nether Structure Generation1.png|thumb|300x300px|Nether structure generation {{in|Java}}. The black lines represent each region and the dots represent coordinates. Green is where they can generate and red is where they cannot.]]
 
[[File:Bedrock Nether Structure Generation.png|thumb|300x300px|Nether structure generation {{in|bedrock}}. The black lines represent each region and the dots represent coordinates. Green is where they can generate and red is where they cannot.]]
 
[[File:Bedrock Nether Structure Generation.png|thumb|300x300px|Nether structure generation {{in|bedrock}}. The black lines represent each region and the dots represent coordinates. Green is where they can generate and red is where they cannot.]]
   

Revision as of 15:40, 27 March 2021

For the secret level in Minecraft Dungeons, see MCD:Nether Fortress.
Nether Fortress
Nether Fortress.png
Biomes

Any Nether biome

Consists of

See § Structure

A Nether fortress, or simply fortress, is a large complex of bridges, corridors, and towers found in the Nether.

Generation

Nether structure generation in Java Edition. The black lines represent each region and the dots represent coordinates. Green is where they can generate and red is where they cannot.

Nether structure generation in Bedrock Edition. The black lines represent each region and the dots represent coordinates. Green is where they can generate and red is where they cannot.

Nether fortresses generate in all Nether biomes. To do so, the game splits the Nether into regions in which one of either a fortress or a bastion remnant can generate. The regions are 432×432 blocks in Java Edition and 480×480 blocks in Bedrock Edition. Each region has a 4 chunk separation located on the south and east borders of the region in which neither a fortress nor a bastion can generate. This leaves only a 368×368 block section in Java Edition or 416×416 block section in Bedrock Edition where a structure can generate. Two structures will never generate in the same region, however they might overlap if they generate close to the separation border. In Java Edition, the chance of a fortress generating instead of a bastion is 25 (40%), while in Bedrock Edition the chance of a fortress generating instead of a bastion is 13 (33.3%).

Nether fortresses can generate buried in netherrack. In such a case, the interior is not filled with netherrack; all hallways and passages are clear except for open walkways and bridges. It is possible but rare for glowstone to generate inside the fortress pathways.

Structure

Segments of a Nether fortress that are fully enclosed.

The general pattern of the walkways.

A lava well found inside a Nether fortress.

Nether fortresses are large complexes, composed of nether bricks materials, that are supported by massive pillars that tower high above the lava oceans. The fortress generation starts with a plain four-way crossing centered at chunk coordinates 11, ~, 11 of the designated chunk. A fortress has two areas, an exterior area of open bridges and an interior area of enclosed corridors. Both the bridges and corridors can end in a "broken" structure or may simply end without elaboration. Fortresses can tunnel through netherrack, giving the "exterior" areas an appearance of tunnels with nether brick floor and netherrack walls and ceilings. At broken sections the terrain is not cleared, which may create a tunnel that leads straight into a wall of netherrack.


The exterior consists of:

  • Straight bridges.
  • Up to 5 plain four-way crossings.
  • Up to 4 four-way crossings with arches made of nether brick and nether brick fence.
  • Up to 4 small rooms with a single entrance, and full-block "stairs" leading to the roof, which may have a single path leading out.
  • Up to 2 blaze spawner platforms: structures consisting of three full-block "stairs" leading to a small platform fenced with nether brick fence, with a blaze spawner in the center.

Stairs in a nether fortress, with nether wart growing next to them.

The interior of the structures have 1×2 windows with nether brick fences as the windowpanes. The fences also form gate-like structures at the entrances of some rooms and corridors. Rooms include:

  • The lava well room, which is the connection between the interior and exterior areas.
  • Straight corridors.
  • Up to 5 four-way crossings.
  • Up to 20 corridor turns (10 right-turns and 10 left-turns), each with a 13 chance of having a loot chest in the corner.
  • Up to 3 stairways (made from actual stair blocks) leading downward.
  • Up to 2 three-way intersections with a small exterior balcony.
  • Up to 2 stairways leading up to an open landing, which have patches of soul sand and nether wart at the base of the stairs, a corridor leading away from the upper landing, and a corridor behind the stairs. If the room is generated embedded in netherrack, only one block above the landing is cleared.

Blocks

Block
Nether Bricks
Nether Brick Fence
Nether Brick Stairs
Soul Sand
Nether Wart
Chest
Blaze Spawner
Lava

Mobs

A blaze spawner generated in the nether fortress.

Fortresses use a list of possible mobs to spawn that is separate from the rest of the Nether. Fortresses spawn magma cubes at a much higher rate, and also spawn two exclusive mobs not found anywhere else: blazes and wither skeletons. Normal skeletons can also appear. Endermen and ghasts do not spawn in fortresses.

In Java Edition, the spawning algorithm has two checks:

  1. It checks if the spawn coordinates are within the "bounding box" of a single piece (e.g. corridor or walkway) of the fortress. In this case the block type of the ground does not matter.
  2. It checks if the spawn coordinates are within the "bounding box" of the entire fortress and whether the ground consists of nether bricks.

If either check passes, it uses the special mob list for fortresses rather than the general list for the Nether when choosing the mob to spawn. The actual mob spawning proceeds as normal for the mob chosen from this list.

In Bedrock Edition, instead of spawning anywhere within a structural bounding box, mobs spawn only on the northwest corner of various blocks scattered few and far between throughout the fortress. In order to identify these spawning spots, glass panes must be placed all over the fortress at the second block up from the ground.

In Java Edition
MobSpawn chanceGroup size
Hostile category
Blaze10282–3
Zombified Piglin5284
Wither Skeleton8285
Skeleton2285
Magma Cube3284

Loot

A chest that generated in a nether fortress.

See also: Chest loot

Fortresses generate nether fortress loot with chests in the indoor sections placed at some corridor turns.

In Java Edition, each nether fortress chest contains 2–4 item stacks, with the following distribution:

Item Stack Size [A] Weight [B] Chance [C] Avg.
per chest
[D]
Avg. # chests
to search
[E]
Gold Ingot 1–3157349.0%1.2332.0
Saddle 1107335.3%0.4112.8
Golden Horse Armor 187329.1%0.3293.4
Nether Wart 3–757319.0%1.0275.3
Iron Ingot 1–557319.0%0.6165.3
Diamond 1–357319.0%0.4115.3
Flint and Steel 157319.0%0.2055.3
Iron Horse Armor 157319.0%0.2055.3
Golden Sword 157319.0%0.2055.3
Golden Chestplate 157319.0%0.2055.3
Diamond Horse Armor 137311.8%0.1238.5
Obsidian 2–42738.0%0.24712.5

In Bedrock Edition, each nether fortress chest contains 2–4 item stacks, with the following distribution:

Item Stack Size [A] Weight [B] Chance [C] Avg.
per chest
[D]
Avg. # chests
to search
[E]
Gold Ingot 1–3157349.0%1.2332.0
Saddle 1107335.3%0.4112.8
Golden Horse Armor 187329.1%0.3293.4
Nether Wart 3–757319.0%1.0275.3
Iron Ingot 1–557319.0%0.6165.3
Diamond 1–357319.0%0.4115.3
Flint and Steel 157319.0%0.2055.3
Iron Horse Armor 157319.0%0.2055.3
Golden Sword 157319.0%0.2055.3
Golden Chestplate 157319.0%0.2055.3
Diamond Horse Armor 137311.8%0.1238.5
Obsidian 2–42738.0%0.24712.5
  1. a b The size of stacks (or for unstackable items, number) of this item on any given roll.
  2. a b The weight of this item relative to other items in the pool.
  3. a b The odds of finding any of this item in a single chest.
  4. a b The number of items expected per chest, averaged over a large number of chests.
  5. a b The average number of chests the player should expect to search to find any of this item.

Advancements

Icon Advancement In-game description Parent Actual requirements (if different) Resource location
Advancement-plain-raw.pngA Terrible Fortress
Break your way into a Nether Fortress NetherEnter a Nether fortress.nether/find_fortress

Video

History

Java Edition
1.0.0September 16, 2011Jeb tweets a teaser screenshot of changes to the Nether terrain generation, including fortresses.
September 19, 2011Jeb releases a second teaser screenshot, showcasing the structure of the upcoming fortresses.
September 21, 2011Jeb mentions that he is finished with most of the new Nether features, including two new mobs, one of which is a "retexturing attempt".
Beta 1.9 PrereleaseAdded fortresses.
1.4.212w36aWither skeletons and skeletons now naturally spawn in fortresses.
Other mobs also found in fortresses spawn less often due to that addition. Zombie pigmen became remarkably more uncommon though due to their weight being halved.
1.6.113w18aChests now generate.
1.814w27aFortresses are now affected by the "Generated structures" option.
14w30aAdded possibility of obsidian in chests.
1.915w43aReduced loot in chests from 2–5 stacks to 2–4.
1.1620w06aFortresses can now spawn in the soul sand valley biome.
20w15aFortresses can now spawn in the basalt deltas biome.
20w16aFortresses now generate evenly throughout the Nether.
Pre-release 3Fortresses are now slightly more common.
Pocket Edition Alpha
v0.12.1build 1Added fortresses.
v0.15.0build 1Horse armor can now be found in chest loot.
Legacy Console Edition
TU7CU1 1.0 Patch 11.0.1Added fortresses.
TU9Changed fortresses to make nether wart rooms more likely.
TU19CU7 1.12 Chests now generate.
New Nintendo 3DS Edition
0.1.0Added fortresses.

Issues

Issues relating to "Nether Fortress" are maintained on the bug tracker. Report issues there.

Trivia

  • In rare cases, a fortress may not generate any indoor rooms except one single lava room, forcing the player to go to another fortress (or housing unit bastion) to find their first nether wart.
  • Sometimes, two or more fortresses can generate close to or even within one another, ultimately creating an even larger cumulative fortress.
  • Under the lava well, there is an opening out of the fortress, with a single block of nether bricks from which the lava spreads out.
  • For 1.16 nether biomes, the soul sand valley bone blocks and basalt pillars (down to within three blocks as-usual of a walkway) can replace more nether bricks. Less-often, crimson forest and warped forest huge fungi, nether wart blocks and warped wart blocks and crimson stems and warped stems can replace nether brick, most visibly along walls.

Gallery