Open Parties and Claims "Additions"
by MaoLMFAO
Open Parties and Claims Additions, usually shortened to OPACA, is a Fabric extension that adds stronger protection rules to the Open Parties and Claims system.
What it does
OPACA extends Open Parties and Claims with advanced rule options that let land protection be tuned in more detail, including how players may act inside claims. Server administrators can fine-tune claims for survival PvP and roleplay servers, and custom modpacks can set the rules without rewriting the existing protection systems. The mod also integrates directly with the Open Parties and Claims config.
A key addition is dimension-specific protection. Claims can be configured to apply only in claimable dimensions, so the Overworld can stay protected while other dimensions allow free activities such as mining. Open Parties and Claims is required and must be installed alongside it.
OPACA is published for Fabric only, with a single release, 1.0.0 for 1.20.1, dated 2025-04-27. Installation covers the server and each player's game. The code is released under the CC0 1.0 Universal license and is open source.
Key features
Dimension-specific claims
Claims can be limited to chosen dimensions, so protection in one dimension does not force the same rules on the rest.
Advanced protection rules
Extra rule options let server owners adjust protection and player interactions more precisely than the base system allows.
Config integration
Settings are read from the Open Parties and Claims config, so existing claim setups stay in one place.
Free activities outside claims
Actions such as mining can stay open in unprotected dimensions while the Overworld remains protected.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: Server administrators and modpack authors who already use Open Parties and Claims and want finer control over its protection rules, dimensions and interactions.
How it compares
OPAC-Fixes is also client and server, but is open source under the GNU Affero General Public License v3.0 only, with files for 1.20.1 – 1.20.6. Party+ is a Fabric client and server mod for 1.20.4 and is not open source, licensed as All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Open Parties and Claims "Additions" | Fabric | 1.20.1 | Client and server | 2025-04-27 |
| OPAC-Fixes | Fabric | 1.20.1 – 1.20.6 | Client and server | 2026-10-10 |
| Party+ | Fabric | 1.20.4 | Client and server | 2024-03-03 |
Questions
Does OPACA need Open Parties and Claims?
Does the server need OPACA?
Which Minecraft version does OPACA support?
How does dimension-specific protection work?
More from MaoLMFAO
What the author says
An extension mod that adds powerful new protection rules to Open Parties and Claims (OPAC). OPACA (Open Parties and Claims Additions) expands the popular Open Parties and Claims system by introducing advanced rule options for even finer control over land protection and player interactions.
Official listing
- Modrinth page
- modrinth.com/mod/open-parties-and-claims-additions
- Owner
- MaoLMFAO
- Published
- 2025-04-27
- Updated on Modrinth
- 2025-04-27
- Facts verified
- 2026-10-15