Nether fortress

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Nether Fortress
Nether Castle.png

The Nether

Consists of
First appearances

See history

Nether fortresses are structures that are naturally generated in the Nether. They are bridge structures constructed of nether bricks, nether brick fences, and nether brick stairs. They are the only places where nether wart, blaze spawners and wither skeletons can naturally be found.

Structure[edit | edit source]

Nether fortresses are very large complexes made mainly of nether bricks. Nether fortresses can tunnel through netherrack, and the inside of the tunnels will be cleared of netherrack by the terrain generator. However, at broken bridge sections, the terrain is not cleared, which may create a tunnel that leads straight into a wall of netherrack. Their main structure takes a shape of bridges with supporting pillars outside and corridors inside, both which have 3-blocks wide walking space. The bridges can be broken at the end. 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. The rooms include:

  • Lava well rooms
  • Rooms with nether brick stairs in the center and soul sand at sides of the stairway containing two 2×5 rows of nether wart growing on it.
  • Rooms with blaze spawners (normally 2 per fortress), which can have nether brick stairs leading up to them. The rooms also have nether brick fences.
  • Rooms with four exits. Some of them lead only to netherrack.
  • Rooms with a "stairway" of nether brick placed against a wall, leading up to the floor above.

In a nether fortress, there are two sections: an indoor section and an outdoor section. The indoor section has a nether brick roof, and loot chests spawn in the corridors. The outdoor section has no netherbrick roof, although it can tunnel through netherrack, making it seem like it has a roof. The blaze spawning rooms are found in the outdoor section, while the "nether wart farm" rooms are in the indoor section. In every fortress, there is one lava well room, which is the single connection between the indoor and outdoor sections.

An early image of nether fortresses released by Jeb.
A lava well found inside nether fortress.
Stairs in a nether fortress, with nether warts growing next to them.
A blaze spawner generated into the side of some netherrack.
A nether fortress generated on the ground.

Loot[edit | edit source]

See also: Chest loot

Nether fortresses generate nether fortress loot with chests in the indoor sections placed at some interior points where corridors turn at right angles.

Each Nether fortress chest contains 2–4 item stacks, with the following distribution:

Stack Size Weight # Items Chance # Chests

Gold Ingot
1–3 1573 1.233 49.8% 2.0

1 1073 0.411 35.7% 2.8

Gold Horse Armor
1 873 0.329 29.4% 3.4

Nether Wart
3–7 573 1.027 19.2% 5.2

Iron Ingot
1–5 573 0.616 19.2% 5.2

1–3 573 0.411 19.2% 5.2

Flint and Steel
1 573 0.205 19.2% 5.2

Iron Horse Armor
1 573 0.205 19.2% 5.2

Golden Sword
1 573 0.205 19.2% 5.2

Golden Chestplate
1 573 0.205 19.2% 5.2

Diamond Horse Armor
1 373 0.123 11.8% 8.5

2–4 273 0.247 8.0% 12.5

Generation[edit | edit source]

Nether fortresses may be generated in inconvenient places, where half of or even the majority of the fortress is buried in netherrack. The interior will not be filled, however; all hallways and passages will be clear except for open walkways and bridges. It is rare, but possible for glowstone to generate inside of the fortress pathways.

Nether fortresses tend to cluster together in strips that run north and south. When you're searching for your first nether fortress, traveling east or west will give you the best chances of running into one. If you travel north or south, you could travel a long distance between two strips of fortresses. But if you have already found a fortress, you should travel either north or south to find another, which will likely be within a few hundred blocks. Note that north and south generation is just a tendency and you may not find additional fortresses simply by going north and south from a located fortress in every case. Be flexible in your search and note that additional fortresses may still be east or west from a located fortress.

Mobs[edit | edit source]

Nether fortresses spawn magma cubes at a much higher rate. They also spawn two exclusive mobs which cannot be found anywhere else, blazes and wither skeletons. They also have a chance of spawning normal skeletons.

Blazes are desired because of their drop - blaze rods, as well as the high amount of experience they give. Wither skeletons are mostly desired for their wither skeleton skulls, which are necessary to create the wither.

The spawning algorithm has two checks:

  1. It checks if the spawn coordinates are within the "bounding box" of each piece (e.g. corridor or walkway) of any fortress.
  2. It checks if the spawn coordinates are within the "bounding box" of the entire fortress, and that the block under the spawn location is nether brick.

If either check passes, it uses the special mob list for nether 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.

Video[edit | edit source]

History[edit | edit source]

Official release
1.0.0 Beta 1.9-pre1 Added nether fortresses.
1.4.2 12w36a Wither skeletons and skeletons will now naturally spawn in nether fortresses.
1.6.1 13w18a Chests will now generate.
1.8 14w27a Nether fortresses are now affected by the "Generated structures" option.
14w30a Added possibility of obsidian in chests.
1.9 15w43a Reduced loot in chests from 2–5 stacks to 2–4.
Pocket Edition Alpha
0.12.1 build 1 Added nether fortresses.
Console Edition
TU7 CU1 1.0 Patch 1 Added nether fortresses.
TU9 Changed nether fortresses to make nether wart rooms more likely.
TU19 CU7 1.12 Chests will now generate.

Trivia[edit | edit source]

  • Often, nether fortresses spawn with no nether wart gardens in them at all. In some rare cases, a garden will have spawned, but the nether wart will be partially or totally destroyed by falling lava.
  • In extremely rare cases, a nether fortress will not generate any indoor rooms except one single lava room.
  • Nether fortresses use a separate list of spawnable mobs from the rest of the Nether. This allows blazes to spawn naturally and makes magma cubes much more common. Ghasts are not allowed to spawn, preventing them from being trapped inside.
  • Skeletons can spawn in nether fortresses. When the game tries to spawn a wither skeleton it has a 20% chance of spawning as a skeleton instead.
  • Glowstone can spawn in the corridors of nether fortresses.
  • Nether fortresses which spawn high above the lava oceans of the Nether can create huge walls of nether brick.
  • Nether fortresses tend to spawn in "strips" aligning along the Z axis (north/south) in the nether. (Tested over 200 seeds so far, the trend is strong in all tested seeds - confirmed with AMIDST.)
  • Sometimes, two or more nether fortresses can spawn very close or even within each other, ultimately creating an even larger cumulative Nether Fortress.

Gallery[edit | edit source]