OPAC-Fixes
by ImEden6
OPAC-Fixes closes gaps in claim protection for claims made under a claim-protection mod, so explosions and blueprint placements cannot cross claim borders.
What it does
Several mods use their own explosion and block placement or breaking code, which can skip the standard Fabric event listeners that claim protection relies on. OPAC-Fixes intercepts those actions so that blocks and entities inside protected claims stay protected. It covers three compatibility targets: mutated explosions from one mutant-creature mod, which are stopped from destroying blocks or harming entities inside claims; bombs thrown by a merchant in a decoration mod, which are blocked from griefing claimed space; and a blueprint-based ring from a magic mod, which cannot bypass-place or bypass-break blocks inside claims.
The compatibility code for each target loads only when that mod is detected at runtime, so a server without the magic mod does not run that part. The mod requires the claim-protection mod it fixes to be present. It is published for Fabric only, for 1.20.1 – 1.20.6, with 1.1.5 for 1.20.1 as the latest file. A server running it needs every connecting player to have it too. The code is open source under the GNU Affero General Public License v3.0 only, and source code is publicly available.
Key features
Mutant creature protection
Blocks stop mutated explosions from breaking blocks or damaging entities inside protected claims.
Merchant bomb protection
Bombs from a merchant in a decoration mod cannot grief blocks or entities inside protected claims.
Blueprint ring protection
A magic ring cannot bypass-place or bypass-break blocks inside claims through blueprints.
Runtime detection
Each compatibility module loads only when its target mod is found on the running instance.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Claimed servers with explosive mobs
Server owners running a mutant-creature mod alongside claim protection can keep explosions from crossing claim borders.
Modpacks with blueprint magic
Pack builders using a magic mod with blueprint rings can stop bypass placement inside claimed areas.
Who it’s for: Server owners and modpack builders who run a claim-protection mod with mutant-creature, decoration or magic mods and want claims to hold against their mechanics.
How it compares
Spell Engine x Open Parties and Claims is server-side only, published for Fabric for 1.19.2 – 1.21.1 under the MIT License, and is open source. Open Parties and Claims "Additions" is client and server, published for Fabric for 1.20.1 only, under the CC0 1.0 Universal license, and is open source. Create Support for Open Parties and Claims is server-side only for Fabric and Quilt across 1.18.2 – 1.21.4, and is open source under the GNU Lesser General Public License v3.0 only.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| OPAC-Fixes | Fabric | 1.20.1 – 1.20.6 | Client and server | 2026-10-10 |
| Spell Engine x Open Parties and Claims | Fabric | 1.19.2 – 1.21.1 | Server-side only | 2024-09-16 |
| Open Parties and Claims "Additions" | Fabric | 1.20.1 | Client and server | 2025-04-27 |
| (Legacy) Create Support for Open Parties and Claims | Fabric and Quilt | 1.18.2 – 1.21.4 | Server-side only | 2025-02-27 |
Questions
Does OPAC-Fixes need a claim-protection mod?
Does OPAC-Fixes need Fabric API?
Which version should a server use?
Do the compatibility fixes run without their target mods?
In the catalog
OPAC-Fixes is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 11,154 mods support Minecraft 1.20.6.
More from ImEden6
Similar mods
What the author says
A Fabric Minecraft mod that provides claim protection compatibility fixes for Open Parties and Claims (OPAC) when used alongside other popular mods. Some mods implement custom explosion or block placement/breaking mechanics that bypass standard Fabric event listeners, allowing players or mobs to bypass OPAC claims…
Official listing
- Modrinth page
- modrinth.com/mod/opac-fixes
- Owner
- ImEden6
- Published
- 2026-03-13
- Updated on Modrinth
- 2026-10-10
- Facts verified
- 2026-10-15