CurseForge · Minecraft mod
OPAC Fixes
A Fabric Minecraft mod that provides claim protection compatibility fixes for Open Parties and Claims (OPAC) when used alongside other popular mods.
Quick answer
Which OPAC Fixes release should I use?
OPAC Fixes opac_fixes-1.1.5.jar targets 1.20.1 with Fabric. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is OPAC Fixes required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does OPAC Fixes opac_fixes-1.1.5.jar need?
opac_fixes-1.1.5.jar. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add OPAC Fixes without breaking your instance.
Built for OPAC Fixes opac_fixes-1.1.5.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use opac_fixes-1.1.5.jar. It targets 1.20.1 with Fabric; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside opac_fixes-1.1.5.jar. It opens that exact file at the source.
About this project
What does OPAC Fixes add?
OPAC Fixes
A Fabric Minecraft mod that provides claim protection compatibility fixes for Open Parties and Claims (OPAC) when used alongside other popular mods.
Overview
Some mods implement custom explosion or block placement/breaking mechanics that bypass standard Fabric event listeners, allowing players or mobs to bypass OPAC claims protection. This mod surgically intercepts these behaviors to ensure that claims remain protected.
Features
- Mutant Monsters: Prevents mutated explosions (e.g. Mutant Creepers) from destroying blocks and harming entities inside protected claims.
- Supplementaries: Prevents Red Merchants' bombs from bypass griefing blocks and entities in protected claims.
- Botania: Prevents the Ring of Loki from bypass-placing or bypass-breaking blocks inside protected claims using blueprints.
- Conditional Loading: Compatibility mixins for Mutant Monsters, Supplementaries, and Botania only load if the respective mods are detected at runtime.
Installation
- Ensure you have Fabric Loader and Fabric API installed for Minecraft 1.20.1.
- Requires Open Parties and Claims (OPAC) to be present.
- Drop this mod into your
modsfolder.
Project description from CurseForge.
Pick your setup
OPAC Fixes by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
OPAC Fixes versions and loaders
opac_fixes-1.1.5.jar
10 Oct 2026
opac_fixes-1.1.4.jar
5 Sept 2026
opac_fixes-1.1.3.jar
16 Jun 2026
opac_fixes-1.1.2.jar
16 Jun 2026
mutant_creepers_no_explody-1.0.0.jar
13 Mar 2026
Looking for an older file? The official CurseForge project page is in Resources.