RLMixins
by fonnymunkey
RLMixins is a Forge tweak mod for 1.12.2 that patches the behavior of other mods, mostly for the RLCraft modpack.
What it does
RLMixins applies more than 30 patches built for RLCraft, each of which can be toggled in its own config entry. Its config also includes compatibility warnings for simple mod conflicts, and the default settings leave every patch disabled, so the mod changes nothing until a server owner enables a tweak.
The sister mod FermiumMixins is a more general tweaker meant for any modpack, and the two can run together at the same time. RLMixins requires FermiumBooter to load. It is categorized under Optimization, Management, Utility and Game mechanics, is released under All rights reserved and is not open source. Its source code and issue tracker are public, and Forge 1.12.2 files are the only ones published.
Key features
Over 30 patches
The mod carries more than 30 separate patches, each aimed at a behavior in a mod that the RLCraft pack depends on.
Toggleable tweaks
Every patch can be switched on or off individually in the configuration, so a server keeps only the changes it needs.
Compatibility warnings
The config shows warnings for known conflicts, helping a server owner notice a clash before players run into it.
Disabled by default
With the default options every patch is off, so an installed copy stays compatible with other mods until a tweak is turned on.
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
RLCraft servers
Server owners running the RLCraft modpack can enable the patches written for it, which the pack was designed around.
Other modpacks
Owners of other modpacks can select individual tweaks from the config instead of applying a full set at once.
Who it’s for: Server owners and modpack authors who want targeted fixes for specific mods on Forge 1.12.2, mainly those working with RLCraft. Players on a client without these patches gain nothing from the mod alone.
How it compares
Ender's Modpack Tweaks is a Forge 1.12.2 mod for client and server, released under the MIT License and open source. Ore Tweaker is also client and server and open source under the MIT License, but it supports 1.7.10 – 1.18.2 rather than a single version. ThaumPotion Tweaker is Forge 1.12.2 only, optional on the client or server, under All rights reserved and not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| RLMixins | Forge | 1.12.2 | Client and server | 2026-05-26 |
| Ender's Modpack Tweaks | Forge | 1.12.2 | Client and server | 2025-09-07 |
| ThaumPotion Tweaker | Forge | 1.12.2 | Client or server, optional | 2025-07-26 |
| Ore Tweaker | Forge | 1.7.10 – 1.18.2 | Client and server | 2024-01-04 |
Questions
Does RLMixins need FermiumBooter?
Do both sides need RLMixins?
Can RLMixins run with FermiumMixins?
Why does RLMixins do nothing after installation?
In the catalog
RLMixins is one of 3,545 Optimization mods on ModsFinder, and one of 1,441 Optimization mods for Forge. 2,920 mods support Minecraft 1.12.2.
More from fonnymunkey
Similar mods
What the author says
RLMixins is a mixin tweaker mod with patches and tweaks for the modpack RLCraft. Sister mod of FermiumMixins ( which is a more general purpose tweaker mod meant for general modpack use. Both mods can be used at the same time and are fully compatible.
Official listing
- Modrinth page
- modrinth.com/mod/rlmixins
- Owner
- fonnymunkey
- Published
- 2023-03-17
- Updated on Modrinth
- 2026-05-26
- Facts verified
- 2026-10-15