OPAC-Fixes

OPAC-Fixes

A Fabric Minecraft mod that provides claim protection compatibility fixes for Open Parties and Claims (OPAC) when used alongside other popular mods.

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About this 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.

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

  1. Ensure you have Fabric Loader and Fabric API installed for Minecraft 1.20.1.
  2. Requires Open Parties and Claims (OPAC) to be present.
  3. Drop this mod into your mods folder.

Available Versions

MutantCreepers-No-Explody 1.0.0release
MC 1.20.1fabric
March 13, 2026

How to Install OPAC-Fixes 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 (1.20.1).

3

Install Mod

Open the mod browser in the dashboard and search for "OPAC-Fixes". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.20.1

Server-side

Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

OPAC-Fixes 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 (1.20.1). You can switch loaders with one click in the panel.

Is OPAC-Fixes compatible with fabric?

OPAC-Fixes officially supports fabric for Minecraft 1.20.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with OPAC-Fixes – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if OPAC-Fixes 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 OPAC-Fixes with just one click on your server.

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

Details

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

Supported Versions

1.20.1