Ratatoskr

Server-side Valheim plugin that exposes the world over RCON as JSON, plus a Discord bot built on it.

Players install nothing. A dedicated server keeps an up-to-date copy of every persistent object — chests, carts, ships, tombstones, portals, signs, build pieces — and Ratatoskr reads it.

What you get

• Search every chest: where is the iron, how much stone is stored in total
• Chest journal: who took or added what, and when
• Tombstones with their position and contents
• Portals and unpaired tags
• Events: joins, leaves, deaths, raids (with the in-game message), boss kills, first player to reach a new biome
• Play time per player, build pieces per player
• Item names in any language shipped with the game

Requirements

• Valheim dedicated server with BepInExPack Valheim (tested on Valheim 1.0.21, BepInExPack 5.4.2360)
• ValheimRcon 1.6.3 or later

Both are installed automatically when you use a mod manager.

Install the plugin

Install on the server only.

With a mod manager (r2modman, Thunderstore Mod Manager, or your host's mod installer): search for Ratatoskr and install it. BepInEx and ValheimRcon come with it.

By hand:

1. Install BepInExPack Valheim on the server.
2. Download ValheimRcon and Ratatoskr (Manual Download).
3. Copy ValheimRcon.dll and Ratatoskr.dll from the zips' plugins/ folders into BepInEx/plugins/ on the server.
4. Start the server once so the config files are created, then stop it.

Docker (lloesche/valheim-server): set BEPINEX=true, put both DLLs in /config/bepinex/plugins/. Config files live in /config/bepinex/.

Configure RCON

Edit BepInEx/config/org.tristan.rcon.cfg:

[1. Rcon]
Port = 2458
Password = choose-a-long-password
Whitelist IP mask = 127.0.0.1, <IP of the machine running the bot>

RCON does nothing while the password is empty. Restart the server after any change here: the whitelist is only read at startup.

Do not open the RCON port to the Internet. Run the bot on the same machine or network as the server.

Check it works

From any RCON client (for example rcon-cli), on the server:

rcon -a 127.0.0.1:2458 -p choose-a-long-password rtWorld

You get a JSON line with the in-game day and the players online.

Plugin options

BepInEx/config/dev.tiene.ratatoskr.cfg:

[General]
Language = French

Language is any column of the game's localization files (English, French, German, …). Searches match that language, English and prefab names.

Discord bot

The bot turns the plugin into slash commands and posts world events in a channel. Messages are in French.

Slash commands: /online, /monde, /cherche, /stock, /journal, /tombe, /portails, /classement, /tempsdejeu, and /admin (save, announcement, kick, teleport to a player or a tombstone, give, stop raid). The bot status shows players online and the in-game day.

1. Create the Discord application

1. Open the Discord Developer Portal → New Application.
2. Bot → Reset Token and copy the token. No privileged intent is needed.
3. OAuth2 → URL Generator: tick bot and applications.commands, then the permissions View Channels, Send Messages and Embed Links. Open the generated URL and add the bot to your server.
4. In Discord, enable Settings → Advanced → Developer Mode, then right-click your server and the events channel → Copy ID.

2. Run the bot

Docker (no checkout needed):

docker build -t ratatoskr-bot https://github.com/tienedev/ratatoskr.git#main:bot

docker run -d --name ratatoskr-bot --restart unless-stopped \
  -e RCON_HOST=192.168.1.10 \
  -e RCON_PASSWORD=choose-a-long-password \
  -e DISCORD_TOKEN=your-bot-token \
  -e DISCORD_GUILD_ID=123456789012345678 \
  -e DISCORD_ALERT_CHANNEL_ID=123456789012345678 \
  ratatoskr-bot

If the bot runs on the game server itself with Docker, use --network host and RCON_HOST=127.0.0.1.

Python (3.11 or later):

pip install "git+https://github.com/tienedev/ratatoskr.git#subdirectory=bot"
RCON_HOST=… RCON_PASSWORD=… DISCORD_TOKEN=… DISCORD_GUILD_ID=… DISCORD_ALERT_CHANNEL_ID=… ratatoskr-bot

Nix: nix run github:tienedev/ratatoskr#bot, or use packages.<system>.bot in a NixOS service.

In Discord, type /online. The commands appear right away when DISCORD_GUILD_ID is set; without it, Discord can take up to an hour to show them.

Settings

Troubleshooting

• "serveur ne répond plus": the bot cannot reach RCON. Check the password, that the bot's IP is in Whitelist IP mask, and that the server was restarted after editing it.
• Commands missing in Discord: set DISCORD_GUILD_ID, and check the invite URL included applications.commands.
• Game freezes on lloesche/valheim-server: ValheimRcon logs every command result at Message level, and a large burst can block the image's log pipeline. Remove Message from [Logging.Console] LogLevels in BepInEx/config/BepInEx.cfg.

RCON commands

Every command returns JSON. ValheimRcon truncates replies above about 4 KB, so lists are paged: {"total", "offset", "next", "items": [...]}. Repeat the call with -offset <next> until next is null.

-all includes containers nobody built, such as dungeon loot.

Sessions, chest journal, discovered biomes and player names are stored as TSV files next to the config.

Limits

• Object IDs change when the server restarts.
• Character stats (damage, kills, skills, personal inventories) live on each player's machine and never reach the server, so they are out of reach for a server-side mod.

Building from source

Copy these assemblies from your server into libs/ (they are not redistributable):

valheim_server_Data/Managed: assembly_valheim.dll assembly_utils.dll assembly_guiutils.dll
                             UnityEngine.dll UnityEngine.CoreModule.dll
BepInEx/core:                BepInEx.dll 0Harmony.dll
BepInEx/plugins:             ValheimRcon.dll

Then, with the .NET 8 SDK (or nix develop):

dotnet build -c Release

The plugin is bin/Release/net48/Ratatoskr.dll.

License

MIT