
Modrinth · Minecraft mod
Arc Lib
Data driven action, reward, condition library.
Quick answer
Which Arc Lib release matches 1.21 NeoForge?
Arc Lib 9.0.0 targets 1.21, 1.21.1 with NeoForge. Installation on the client is optional. Installation on the dedicated server is optional. All 3 required mods have matching files.
Where it goes
Is Arc Lib required on the client, server, or both?
Installation on the client is optional. Installation on the dedicated server is optional.
The source marks this as usable on both the client and server.
What else does Arc Lib 9.0.0 need?
9.0.0 on 1.21 NeoForge. Every mod below is checked against that same setup.
Install Architectury API, UI Lib, YAML Config first. We found matching files for this game-version and loader setup.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Arc Lib without breaking your instance.
Built for Arc Lib 9.0.0 on 1.21 NeoForge. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 9.0.0. It targets 1.21, 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Architectury API, UI Lib, YAML Config first. We found matching files for this game-version and loader setup.
- 03
Put it on the correct side
Installation on the client is optional. Installation on the dedicated server is optional.
- 04
Pick the file you checked
Use the “Get this file” button beside 9.0.0. It opens that exact file at the source.
About this project
What does Arc Lib add?
Arc is a powerful and versatile data-driven action mod library specifically designed for mod developers in Minecraft. This comprehensive library empowers developers to incorporate dynamic actions, conditions, and rewards into their own mods, providing a seamless and customizable experience for players.
With Arc, mod developers can easily implement the Action, Reward, and Condition (ARC) framework into their mods, enabling them to create complex gameplay mechanics and immersive features. By leveraging this library, developers can add a layer of interactivity and progression to their mods, enhancing the overall player experience.
The core functionality of Arc revolves around the ARC framework, which allows mod developers to define and configure actions, conditions, and rewards based on specific in-game events and criteria. This powerful system enables the creation of unique gameplay elements, where actions trigger rewards when the associated conditions are met.
For example, a mod developer utilizing Arc can define an action such as "On Block Place." They can then set the condition to specific blocks like "Stone" or "Dirt." Finally, they can assign a reward, such as "1 Diamond," which will be granted to the player upon meeting the condition.
The library provides a wide range of customizable options for actions, conditions, and rewards. Developers can define actions based on various in-game events, including interactions with entities, block placements, item usage, mob defeats, and much more. Conditions can be set using criteria such as block types, item properties, entity attributes, player location, game time, or any other relevant game state. Rewards can be tailored to include items, experience points, buffs, or any other desired benefits.
Arc offers a developer-friendly interface, making it easy to integrate the library into existing mods and modify existing gameplay systems. It provides comprehensive documentation, examples, and code snippets, enabling mod developers to quickly grasp and utilize the full potential of the ARC framework.
Empower your mod development journey with Arc - the ultimate data-driven action mod library for Minecraft. Harness the power of dynamic actions, conditions, and rewards, and elevate your modding experience to new heights.
Project description from Modrinth.
Pick your setup
Arc Lib by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.2
2 loader builds26.1.2
2 loader builds26.1.1
2 loader builds26.1
2 loader builds1.21.11
2 loader builds1.21.9
2 loader builds1.21.8
2 loader builds1.21.7
2 loader builds1.21.6
2 loader builds1.21.5
2 loader builds1.21.1
2 loader builds1.21
2 loader buildsShowing the newest 12 of 13 game versions. Older files are in the list below.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Arc Lib versions and loaders
9.0.0
arc-9.0.0-neoforge.jar
21 May 2026
1.9.5-1.21.1
arc-1.9.5-1.21.1-neoforge.jar
19 Nov 2025
1.9.4-1.21.1
arc-1.9.4-1.21.1-neoforge.jar
11 Jul 2025
1.9.3-1.21.1
arc-1.9.3-1.21.1-neoforge.jar
29 Mar 2025
1.9.1-1.21.1
arc-1.9.1-1.21.1-neoforge.jar
21 Feb 2025
1.9-1.21.1
arc-1.9-1.21.1-neoforge.jar
18 Feb 2025
1.8.3-1.21.1
arc-1.8.3-1.21.1-neoforge.jar
17 Feb 2025
1.8.2-1.21.1
arc-1.8.2-1.21.1-neoforge.jar
17 Feb 2025
1.8.1-1.21.1
arc-1.8.1-1.21.1-neoforge.jar
8 Feb 2025
Looking for an older file? The official Modrinth project page is in Resources.
