PolyMc-Extra
by SAGUMEDREAM
PolyMc-Extra is a Fabric library for server owners that patches Polymer-based content and registers extra model and entity mappings for Polymer.
What it does
Players do not need to install this library. It runs on the server alone, so clients join without any extra step. Its job is to scan the JAR files of required resources, generate the resource packages those mods depend on, and automatically patch mods that regular players do not need to install.
Beyond patching, the library registers built-in model types and special entity mappings, and it finds its entry points in the execute module through PolyMcExtraEntrypoint. It also checks the integrity of item components and documents how to use some of its supporting libraries, including Polymer and blockbench-import-library. A module uses ASM to modify certain enums and replace Vanilla registry entries, which can prevent some abnormal errors.
Polymer is the required dependency and must be installed alongside PolyMc-Extra. The library is published for Fabric only, across eight release versions 1.21.6 – 26.1.2, with beta builds for the newest game versions. It is released under the GNU General Public License v3.0 only, and it is open source.
Key features
Automatic mod patching
Mods that regular players do not need to install are patched on the server without manual edits.
Resource package generation
Required resource JAR files are scanned and turned into resource packages for the server.
Built-in model and entity mappings
The library registers its own model type and special entity mappings for Polymer content.
Item component checks
Item components are verified for integrity, and an enum module replaces Vanilla registry entries where needed.
Gallery
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
How it compares
Farest's API is a Fabric library covering 1.21 – 1.21.10, with a client and server environment, and it is open source under the GNU Lesser General Public License v3.0 only. Side Effects is a server-side only Fabric mod for 1.18.2, also open source under the GNU Lesser General Public License v3.0 only. Registry Library is a Fabric library for 1.19.2 – 1.20.2 released under the MIT License, where the server needs it and players may leave it out.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| PolyMc-Extra | Fabric | 1.21.6 – 26.1.2 | Server-side only | 2026-05-23 |
| Farest's API | Fabric | 1.21 – 1.21.10 | Client and server | 2025-12-14 |
| Side Effects | Fabric | 1.18.2 | Server-side only | 2022-04-18 |
| Registry Library | Fabric | 1.19.2 – 1.20.2 | Server required, client optional | 2023-12-01 |
Questions
Does PolyMc-Extra need Polymer installed?
Do players need PolyMc-Extra on their clients?
Which game versions have files for PolyMc-Extra?
In the catalog
PolyMc-Extra is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 15,189 mods support Minecraft 26.1.2.
More from SAGUMEDREAM
Similar mods
What the author says
You should first learn how to use some libraries. If the module uses ASM to modify certain enums or replaces Vanilla's registry entries, it will cause some abnormal errors.
Official listing
- Modrinth page
- modrinth.com/mod/polymc-extra
- Owner
- SAGUMEDREAM
- Published
- 2026-01-18
- Updated on Modrinth
- 2026-05-23
- Facts verified
- 2026-10-15