More Alt Biomes

Granularly configure the spawn chance and max placement amounts for all 32+ Valheim 1.0 AltBiomes!

Valheim 1.0 introduced "Alt Biomes" - over 30 procedural variations of existing biomes (like "Dark Meadows", "Rock Black Forest", and "Trees Mistlands") that alter vegetation, props, and spawns. This mod exposes all of them so you can drastically multiply their spawn rates across your world!

Features

• Granular Control: Configure the Chance Multiplier and Max Amount Multiplier for every single one of the 32 vanilla AltBiomes individually, or use the Global sliders to multiply them all at once.
• Pre-Baked Vanilla List: The 32 vanilla variations are hardcoded in, so they appear in your config menu immediately upon installation.
• Dynamic Mod Support: If you install other mods that add custom AltBiomes, this mod will automatically discover them when you load into a world, save them to your .cfg file, and show them in your config menu forever!
• Safe Multipliers: Safely injects the multipliers during world generation and restores vanilla parameters immediately after, preventing multiplicative compounding across multiple generations.
• Success Logging: Loudly logs exactly how many zones of each AltBiome were successfully injected into your map in the BepInEx console so you can see your multipliers working in real-time.

Configuration

This mod is fully compatible with ConfigurationManager for in-game tweaking!

• Press F1 at the Main Menu to open the Configuration Manager.
• Tweak the sliders (0.1x to 10.0x).
• Generate a new world (or use a tool like Upgrade World to regenerate existing areas) and watch the new biomes spawn!

Installation

Using a Mod Manager (Recommended)

1. Download and install a Thunderstore-compatible mod manager (like r2modman or Gale).
2. Search for More Alt Biomes in the online tab and click "Download".
3. Launch the game using the "Start Modded" button in your manager.

Installing Manually

1. Extract the contents of the zip file.
2. Navigate to your Valheim game directory (usually C:\Program Files (x86)\Steam\steamapps\common\Valheim).
3. Open the BepInEx folder, then open the plugins folder.
4. Drop the MoreAltBiomes.dll file into the plugins folder.

FAQ: Custom Biomes & Mod Authors

Because More Alt Biomes dynamically reads the Valheim ZoneSystem prefab when a world loads, it natively supports custom AltBiomes added by other mods!

For Users (The "Dummy World" Trick): If you install a mod that adds a new AltBiome, More Alt Biomes won't know its name until the game loads it into memory.

1. Load into any world.
2. The game will unpack the mod's new biomes.
3. More Alt Biomes will instantly detect them and permanently save them to your com.loathe.MoreAltBiomes.cfg file.
4. From then on, they will always appear at the Main Menu for you to configure!

For Mod Authors: If you are building a custom biome mod and want your AltBiome to appear in our ConfigurationManager menu immediately at the Main Menu (without the user having to load a dummy world first), you can proactively inject it! Simply write to our BepInEx config file early in your plugin's Awake phase, or ensure your AltBiome is injected into AltBiomeList.m_alts before FejdStartup completes. If you manually create a BepInEx config entry in com.loathe.MoreAltBiomes.cfg that ends with Chance Multiplier (e.g. MyCustomBiome Chance Multiplier), our text parser will automatically pick it up and build a slider for it!