Expand World Data

Allows adding new biomes, changing world generation, and configuring spawns, events, and drops.

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Changelog & versions

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Stars: 3
Downloads: 489
Version: 1.76.0
Updated: 2026-10-11
Author: JereKuusela
Virus scan: ✓ Scan successful
Runs on: Client & Server
Required by: 20 mods

Compatibility

Required 1

Install these too — Gale pulls them in for you.

YamlDotNet ValheimModding ·16.3.1

Description

Expand World Data

Allows adding new biomes and changing most of the world generation.

Always back up your world before making any changes!

Install on all clients and on the server (modding guide).

Some features are available also as server only mode.

Usage

See documentation.

See examples.

for help and examples.

Ashlands update

expand_locations.yaml has new fields. These are not used by old locations so old data should work.
expand_locations.yaml has some removed locations. Check warnings and clean it up.
expand_vegetation.yaml has new fields. These are not used by old vegetation so old data should work.
expand_environment.yaml should no longer have Ashrain. Remove it.

Tutorials

How to make custom biomes: https://youtu.be/TgFhW0MtYyw (33 minutes, created by StonedProphet)
How to use blueprints as locations with custom spawners: https://youtu.be/DXtm-WLF6KE (30 minutes, created by StonedProphet)

Credits

Thanks for Azumatt for creating the mod icon!

Thanks for blaxxun for creating the server sync!

Sources: GitHub Donations: Buy me a computer

Changelog

1.76

Fixes error when trying to override container inventory.
- Removes obsolete fields addLocations and addVegetation from altbiomes yaml.

1.75

Fixes custom location icons not working. Thanks sighsorry!
- Fixes custom location group system not working.
- Fixes error on CleanGhostInit (now should how warning instead).
- Fixes commands ew_spawns, ew_test_spawn and ew_try_spawn missing.
- Fixes changes to non-world data like clutter triggering full refresh.
- Reworks data system to match Expand World Prefabs mod.
- Reworks the world refresh system to be shared with Expand World Size mod (no double refresh).

1.74

Adds field altBiome to the world data to assign alternative biomes to specific areas.
- Adds fields sizeX, sizeY, rotation and wiggleRectangle to the world data for rectangular areas.
- Adds field requiredPersistentEvent to the spawn data for specifying persistent event requirements.
- Adds field addBaseSeedToRandomSpawn to the dungeon data for including the dungeon base seed in random spawner seeds.
- Adds field snowBuildup to the environment data for specifying snow accumulation levels.
- Adds fields auroraIntensity*, auroraColors, cloudOpacity*, aoIntensity*, colorAmbientOcclusion and psystemsOutsideOnly to the environment data.
- Adds fields interiorRadius, interiorEnvironment, enemyMinLevel, enemyMaxLevel, enemyLevelUpChance, enemyLevelExcludeGroups and blockSpawnGroups to the location data.
- Adds syncing of client side location data (discoverLabel, noBuild, exteriorRadius, interiorRadius, interiorEnvironment, enemy level and spawn group fields).
- Adds migration for new fields (fixes some Deep North spawns spawning everywhere).
- Fixes default world data putting Mountains before Deep North.
- Fixes drops.yaml not being loaded.
- Fixes some possible data sync issues.
- Fixes clutter data triggering world regeneration.
- Improves data reloading to only regenerate the affected parts (terrain, water, map, clutter) instead of the whole world.
- Removes the Regenerate map setting (the map is always regenerated when needed).
- Optimizes the mod by conditionally patching only necessary parts of the game.

3 older entries, full version history & downloads →

Expand World Data

Compatibility

Required 1

Description

Expand World Data

Usage

Ashlands update

Tutorials

Credits

Changelog

Install BepInExPack Valheim

Install Expand World Data