
Conium
Conium is a datapack and script framework for modern Minecraft, it provides very diverse features without Java coding, Conium lets you complete your mods only using datapacks.
Screenshots

About this Mod
What is Conium
新世代を呼ぶハロー、声はまだ途切れないだろう、
新世界の扉を、ほら叩き続けよう!
Conium is a datapack and script framework for modern Minecraft, it provides very diverse features without Java coding, Conium lets you complete your mods only using the datapacks.
Warning
The full Conium feature is currently as 'on client' mode, the server needs to synchronize the datapacks and scripts to client but are not completed this feature now.
But the Conium scripting system can run on the server side completely, only the bedrock scripting APIs are not available on the server side now.
Requirements
| Requirement | Version | Installs | Notes |
|---|---|---|---|
| Java | 21+ | 21 Or higher | 21 Or higher is ok |
| Minecraft | >=1.21.11 | Need | 1.21.11 or higher can be use |
| Fabric language kotlin | 1.13.5+kotlin.2.2.10!! | Need | Only kotlin 2.2.10 can be use |
| Fabric API | ? | Need | Any version is ok |
Build requirements
Conium has configured whole project, just clone the repository, and reload project then run the gradle task remapJar.
| Requirement | Version | Notes |
|---|---|---|
| Java | 21+ | 21 Or higher |
| Gradle | 8.14.2 | 8.14.2 or higher could be use |
| Kotlin | 2.2.10!! | Only 2.2.10 can be use |
| Fabric loom | 1.13-SNAPSHOT | 1.13-SNAPSHOT or other could be use |
| Minecraft | >=1.21.11 | Only 1.21.11 or higher can be use |
NeoForge
About supporting of NeoForge, currently cannot be completed because the secure jar handler in NeoForge has conflict to kotlin native.
And Conium cannot remove kotlin native because scripting running needs, Conium may try to run script evaluator without NeoForge environment in the future.
Discord server
You can join ours discord server to chat with Conium community!
Data driven
See the Data driven
Conium script APIs
See the Conium scripting.
Bedrock script APIs
Not completed bedrock script APIs supports now, only framework able to run the samples.
Grammars
About TypeScript grammar, supported by structuring-translator: TypeScript supports
The MoLang support also based on structuring-translator but implemented by Conium: MoLang supports
Source Code and Contributions
Conium is built on an event-driven, context-oriented architecture with strong aspect-like capabilities, though it does not use event-sourced state semantics.
The codebase is architecturally complex and extensive. While we continuously improve documentation, navigating the source may still be challenging.
Therefore, we strongly recommend discussing your ideas with the core team before contributing. This ensures alignment with the project’s design and specifications.
Please note that pull requests submitted without prior discussion may be declined. For general inquiries, we encourage you to submit an issue tagged “question.”
Hitokoto
Conium will randomly roll a Hitokoto in console every time launching, the list of Hitokotos receives pull requests, only allow in English and Japanese, don't take other languages, don't accept nonsense sentences.
For the list, see ConiumHitokoto.kt.
Available Versions
How to Install Conium on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "Conium". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11, 1.21.8, 1.21.7 (+3 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Conium server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.
Is Conium compatible with fabric?
Conium officially supports fabric for Minecraft 1.21.11, 1.21.8, 1.21.7. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Conium – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Conium consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
Similar Mods
Rent Modded Server
Install Conium with just one click on your server.