# Cernution

*6K, 1.21.5+ & 26.3, The Sancuary plateaus + Burried Treasure Structures + full featured vanilla structure additions*

A 36km² custom Minecraft Survival Map, created by McMeddon.
Plateaus surrounded by giant dune fields, which are surrounded by a giant mountain ring. The sanctuary plateaus in center, giant mountain chains around. Plains and lush forest in the north east, with mangroves & jungles further south. Badlands and red deserts in the south, and a giant tundra like sub polar steppe below the arctic region in the north.

This world did quite a few leaps, changes to layouts, tree placements, and a technical development that allowed me to inject vanilla data into the chunks after export. To let your local minecraft version take over and generate vanilla structures with features again. Which was sadly not possible in versions after 1.16 with worldpainter.

Additionally a technical addition was made to autofix stale or false nbt container data, to randomize loot and prevent stale vaults.

## Details

- Creator: McMeddon
- Type: Survival world
- World size: 6144 x 6144 blocks (6K)
- Elevation range: -64 to 320 blocks
- Spawn point: X 3072, Y 164, Z 3072
- Playable version: 1.21.5–26.3+
- Older releases: Exported for 1.21.5, made for 26.3 with its newer biomes and blocks built in. It opens in 1.21.5 and later, but only 26.3 or newer shows it as built. An older release does not know the newer content, so new biomes turn into plains and new blocks and mobs are removed. Biomes added after 1.21.5: Dappled Forest, Sulfur caves. On this map in 1.21.5, for example: Dappled Forest (becomes plains), Sulfur caves (becomes plains), Cinnabar, Sulfur, Potent sulfur.
- Survival friendly: Yes. Confirmed by the scan: loot tables, structures, animals, ores present in the save. Plays in vanilla Minecraft with no mods or datapacks
- Editions: Java, Bedrock
- Made of: Grassland 24%, Forest 17%, Arid 17%, Shore 15%, Mountain 13%, Wetland 7%, Cold 5%, Cave 2%, Mushroom 0.3%
- Beyond the border: Vanilla chunks
- Published: 2026-10-18
- Inspection: incomplete. No structure has been located and pinned by hand yet.

## Biomes

Shares are measured across the built map. Past its edge the world keeps generating normal vanilla Minecraft chunks, so biomes missing from this list can still be found out there.

37 biomes. Land 55%, Water 44%.

Made of: Grassland 24%, Forest 17%, Arid 17%, Shore 15%, Mountain 13%, Wetland 7%, Cold 5%, Cave 2%, Mushroom 0.3%.

### Land (55% of the map, 28 biomes)

- Plains: 24% of land
- Beach: 10% of land
- Desert: 9% of land
- Stony Peaks: 8% of land
- Stony Shore: 6% of land
- Wooded Badlands: 6% of land
- Swamp: 5% of land
- Windswept Gravelly Hills: 5% of land
- Flower Forest: 4% of land
- Mangrove Swamp: 3% of land
- Jungle: 3% of land
- Dappled Forest: 2% of land
- Savanna: 2% of land
- Snowy Taiga: 2% of land
- Cherry Grove: 2% of land
- Dark Forest: 1% of land
- Birch Forest: 1% of land
- Sparse Jungle: 1% of land
- Pale Garden: 1% of land
- Snowy Slopes: 1% of land
- Snowy Plains: 1% of land
- Meadow: 1% of land
- Taiga: 0.9% of land
- Forest: 0.8% of land
- Jagged Peaks: 0.5% of land
- Mushroom Fields: 0.3% of land
- Old Growth Pine Taiga: 0.2% of land
- Frozen Peaks: <0.1% of land

### Water (44% of the map, 6 biomes)

- Ocean: 56% of water
- Lukewarm Ocean: 23% of water
- Warm Ocean: 9% of water
- River: 9% of water
- Cold Ocean: 4% of water
- Frozen River: <0.1% of water

## Structures

17 of 20 confirmed present. A pinned marker outranks the scan; anything not confirmed is what the scan alone recorded.

Counted inside the built map. Past its edge the world keeps generating normal vanilla Minecraft chunks, so structures not confirmed here can still generate out there.

### Surface (6 of 8)

- Abandoned camps: Not checked
- Desert pyramids: Included
- Igloos: Included
- Jungle pyramids: Included
- Pillager outposts: Included
- Swamp huts: Included
- Trail ruins: Included
- Woodland mansions: Searched, not found

### Underground (6 of 6)

- Amethyst geodes: Included
- Ancient cities: Included
- Dungeons / monster rooms: Included
- Mineshafts: Included
- Strongholds: Included
- Trial chambers: Included

### Ocean (3 of 4)

- Buried treasure: Included
- Ocean monuments: Searched, not found
- Ocean ruins: Included
- Shipwrecks: Included

### Portal structures (1 of 1)

- Ruined portals: Included

### Settlements (1 of 1)

- Villages: Included

## Loot tables

33 of 41 confirmed present. Confirmed means the scan read the table out of the save. Not observed means the structure carrying it was not seen in this export, not that the table is impossible here.

Counted inside the built map. Past its edge the world keeps generating normal vanilla Minecraft chunks, so tables not seen here can still turn up out there.

### Chest loot (16 of 22)

- Abandoned mineshaft: Included
- Ancient city: Included
- Buried treasure chest: Included
- Desert pyramid: Included
- End City treasure: Not observed
- Igloo chest: Not observed
- Jungle temple: Included
- Jungle temple dispenser: Not observed
- Nether fortress bridge: Not observed
- Pillager outpost: Not observed
- Ruined portal: Included
- Shipwreck map: Included
- Shipwreck supply: Included
- Shipwreck treasure: Included
- Simple dungeon: Included
- Spawn bonus chest: Included
- Stronghold corridor: Included
- Stronghold crossing: Included
- Stronghold library: Included
- Underwater ruin (big): Included
- Underwater ruin (small): Included
- Woodland mansion: Not observed

### Village chest loot (14 of 16)

- Village armorer: Included
- Village butcher: Included
- Village cartographer: Included
- Village desert house: Included
- Village fisher: Included
- Village fletcher: Included
- Village mason: Not observed
- Village plains house: Included
- Village savanna house: Included
- Village shepherd: Not observed
- Village snowy house: Included
- Village taiga house: Included
- Village tannery: Included
- Village temple: Included
- Village toolsmith: Included
- Village weaponsmith: Included

### Structure loot (2 of 2)

- Abandoned camp loot: Included
- Trial chamber loot: Included

### Archaeology (1 of 1)

- Archaeology loot: Included

## What is inside

- Biomes: yes
- Structures: yes
- Ores: yes
- Plants: yes
- Animals: yes
- Loot: yes
- Caves: yes

Outside the built map the world keeps generating normal vanilla Minecraft chunks, so anything missing here can still be found out there.

## What is new

- Technical: Created a post-export injection tool for vanilla structures.
- Technical: Created a post-export NBT, container, and automatic vault fixer to repair faulty vaults and containers and assign random seeds to loot tables.
- Achieved full structure parity through post-export chunk injection and local generation.
- Structure injection also makes maps from loot chests usable.
- Vanilla mob spawning behavior, including pillager spawning, works in injected vanilla structures.
- Updated swamp huts with a minor fix.
- Added 50+ new rare beach structures for sandy, muddy, and rocky beaches.
- Added sandstone beneath sand dunes for parity.
- Further adjusted swamp density, placement, and insert styles.
- WM: Changed biome distribution, widened the core, reduced its impact on oceans, and increased its impact on land and slopes.
- WM: Further adjusted swamps to fit the new system.
- WM: Updated death masks for the default biome to include more biome types with less overlap.
- WM: Cleaned up masks.
- WM: Added new sulfur caves and a new cave layout.
- WM: Added new castle placement masks.

## Questions about this world

### What is Cernution?

Cernution is a hand-made survival world of 6,144 × 6,144 blocks, made with WorldPainter, World Machine, Gaea, Axiom and WorldEdit, built for Minecraft Java 26.3. You download the world folder and play it like any other save, in singleplayer or on your own server.

### How big is Cernution?

6,144 × 6,144 blocks, so about 38 million blocks of surface. Walking from one edge to the other takes roughly 24 minutes at normal walking speed. The terrain runs from Y -64 to Y 320.

Outside that area the world keeps generating normal vanilla Minecraft chunks, so you never hit a wall, you just leave the built part behind.

### Which Minecraft version does Cernution need?

Cernution is made for Minecraft Java **26.3** and opens in **1.21.5** and later. Between the two, anything added after the release you load it in is removed or replaced (new biomes load as plains), so 26.3 or newer shows the world as built. Releases older than 1.21.5 cannot open it.

Bedrock players need a converted copy. See [the Bedrock notes in the FAQ](https://mcmeddon.com/faq#install-bedrock).

### Which biomes are in Cernution?

37 in total. The land is mostly Plains (23.6%), Beach (9.6%), Desert (9.3%) and Stony Peaks (8.1%), counted as shares of the land rather than of the whole map.

Water covers 43.6% of the map, and land 55.4%.

The [full breakdown](https://mcmeddon.com/worlds/20261018-cernution#biome-composition) is further up this page, with every biome and its share.

### Which structures are in Cernution?

17 of the 20 structure types the scan checks are confirmed present: surface (6/8), underground (6/6), ocean (3/4), portal structures (1/1) and settlements (1/1).

Not confirmed: Abandoned camps (not checked), Woodland mansions (searched, not found) and Ocean monuments (searched, not found). "Searched, not found" means the scan looked and came up empty; "not checked" means it has not been looked for yet.

[The structure list](https://mcmeddon.com/worlds/20261018-cernution#structure-coverage) above names every one of them.

### Is Cernution ready to play in survival?

Yes. A scan of the world file confirms loot tables, structures, animals and ores, so the survival loop runs from the first night: chests hold the game's real loot tables, mobs spawn as they do anywhere else, and you can mine, farm and build without adding anything. It plays in vanilla Minecraft, with no mods, no datapacks and no creative mode.

The [world contents report](https://mcmeddon.com/worlds/20261018-cernution#world-contents) at the bottom of this page holds the item-by-item detail.

### Where do I download Cernution?

From the [download link](https://mcmeddon.com/go/2ygpvn0uuq35m) on Google Drive, also on the button at the top of this page.

Also available: the [PlanetMinecraft project page](https://www.planetminecraft.com/project/cernution/), which carries the release notes and the known issues for this particular build.

### What is new in Cernution?

Every world is built on the one before it, and Cernution brought 15 logged changes into the line: new terrain, new assets and fixes to the generators that made it.

From its list:

- Updated swamp huts with a minor fix.
- Added sandstone beneath sand dunes for parity.

The [full list](https://mcmeddon.com/worlds/20261018-cernution#world-changelog) is on this page. These are the world's own additions, not patches released after it, so an older download is not missing them.

### Can I look at Cernution before downloading it?

Yes. [Open it in the 3D explorer](https://mcmeddon.com/worlds/20261018-cernution/explore) and fly the real terrain in your browser, with the biomes, the caves and the marked structures. Nothing to install.

General questions about downloading and installing: https://mcmeddon.com/faq.md

## Downloads

- [Download world (Google Drive)](https://mcmeddon.com/go/2ygpvn0uuq35m)

## Elsewhere

- [Official PlanetMinecraft Post](https://www.planetminecraft.com/project/cernution/)

## Rights

Creative Commons Attribution-NonCommercial 4.0, with commercial servers and media
allowed by exception.

Allowed: play it, stream it, put it in videos; run it on your server, commercial or not;
share videos, images, renders and art, commercial or not; remix and redistribute, meaning
build on top and share with friends and your community.

Not allowed: sharing the map as-is, reselling it or selling it on the Marketplace,
bundling worlds into modpacks, claiming it as your own, or skipping the attribution.

Credit like this: `World by McMeddon, "Cernution"`, with a link back to
https://mcmeddon.com/worlds/20261018-cernution wherever the format allows one.

## On this site

- [World overview](https://mcmeddon.com/worlds/20261018-cernution)
- [3D map viewer](https://mcmeddon.com/worlds/20261018-cernution/explore)