Conium

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.

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Screenshots

Bedrock script sample

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

Conium 1.0.0-alpha14alpha
MC 1.21.11fabric
January 5, 2026
Conium 1.0.0-alpha13alpha
MC 1.21.8fabric
September 3, 2025
Conium 1.0.0-alpha12alpha
MC 1.21.6, 1.21.7, 1.21.8fabric
July 26, 2025
Conium 1.0.0-alpha11-fix1alpha
MC 1.21.6, 1.21.7, 1.21.8fabric
July 2, 2025
Conium 1.0.0-alpha11alpha
MC 1.21.7, 1.21.8fabric
July 2, 2025

How to Install Conium on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).

3

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

fabric

Minecraft Versions

1.21.11, 1.21.8, 1.21.7 (+3 more)

Server-side

Required

Recommended 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.

Rent Modded Server

Install Conium with just one click on your server.

Recommended RAM
4 GBab €8/mo
Min. 3 GB | +1 GB pro 8 Spieler
Create Server Now
1-Click Mod Install
NVMe SSD Storage
DDoS Protection included

Details

License
GNU General Public License v3.0 only
Server-side
Required

Supported Versions

1.21.111.21.81.21.71.21.61.21.41.21.3