Expand World Data
🟡 Updated this year⚠️ Install Order · 1 step
Install in this order, then this mod last — most mods fail to load without their framework and dependencies in place.
Preview

🔍 Analysis
- 👍 0.8% endorsement rate
- 🏆 #268 of 858 Gameplay mods in this game by downloads
📋 About This Mod
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.
See documentation.
Join Discord for help and examples.
See examples.
Migration for Hildir update
New dungeons, environments, events and locations are added automatically. Changes to existing dungeon rooms require manual changes.
Automatic changes
- []expand_locations.yaml should automatically add DevSpawnTest, Hildir_cave, Hildir_crypt and Hildir_plainsfortress.[/]
-
[]Expand World Data version 1. 7 did not add these correctly.[/]
[]Check that Hildir_plainsfortress has
noBuild: 8. 75[/]
-
[]expand_environments.yaml should automatically add CavesHildir and CryptHildir.[/]
[]expand_events.yaml should automatically add hildirboss1, hildirboss2 and hildirboss3.[/]
[]expand_dungeons.yaml should automatically add DG_Hildir_Cave, DG_Hildir_ForestCrypt and DG_Hildir_PlainsFortress.[/]
-
[]Expand World Data version 1. 5 did not add these correctly.[/]
[]Search and replace:[/]
[]1024 to CaveHildir[/]
[]2048 to ForestCryptHildir[/]
[]4096 to PlainsFortHildir[/]
- []expand_rooms.yaml should automatically add new rooms (for example plainsfortress_Hildir_Floor0).[/]
-
[]Expand World Data version 1. 5 did not add these correctly.[/]
[]Search and replace:[/]
[]1024 to CaveHildir[/]
[]2048 to ForestCryptHildir[/]
[]4096 to PlainsFortHildir[/]
Manual changes
-
[]expand_rooms.yaml is missing changes to the old rooms.[/]
[]If you have changed the file, copy it to another folder.[/]
[]Delete the expand_rooms.yaml so that it regenerates when loading a world.[/]
[]Use any tool to compare the files. Update room themes as needed.[/]
- 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)
Thanks for Azumatt for creating the mod icon!
Thanks for blaxxun for creating the server sync!
Sources: GitHub
Donations: Buy me a computer
-
[]expand_rooms.yaml is missing changes to the old rooms.[/]
Expand World Data is a gameplay mod for Valheim that lets you add new biomes and tweak most world generation settings. With 35 endorsements and over 4,000 downloads, it's a niche tool for players who want to customize their world beyond vanilla limits. The author warns to back up your world before making changes.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Decent download count (4,183) shows real interest from the community.
- Opens up creative possibilities for custom world building.
- Active development (last updated July 2026) means it's likely kept current.
⚠️ Cons
- Low endorsement count (35) compared to downloads suggests it might be finicky or not widely tested.
- No detailed instructions or documentation provided by the author.
- World generation changes can break saves if not handled carefully—backup warning is a red flag for potential issues.
For Valheim players who want to break free from the vanilla world and craft truly unique biomes. If you're a modder or a creative builder looking to push the game's limits, this is your tool. Skip if you prefer a stable, out-of-the-box experience or don't want to risk your world saves.
💡 Beginner Tips
- Always back up your world files before enabling this mod—the author explicitly warns about this.
- Test new biome settings on a fresh world first to avoid corrupting your main save.
- Check the mod's page for any compatibility notes with other world-gen mods, as conflicts can cause crashes.
📊 Mod Details
- Game
- Valheim Mods
- Author
- Jere Kuusela
- Version
- 1.68
- Downloads
- 4,183
- Endorsements
- 35
- Category
- Gameplay
- Created
- 9/12/2023
- Updated
- 7/22/2026
🔗 Required By 3 Mods
These mods list this mod as a dependency.
🧩 Commonly Used Together
Users add these mods to the same collections — a real compatibility signal, not an AI guess.
🔧 How to Install Valheim Mods
Download from Nexus.
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Visit the official mod page for specific installation instructions for this mod.
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