Jmon's Extended Mechanics (JEM)
This mod adds many small features to the game while keeping vanilla minecraft balanced. Inspired by Quark, Cell, and many other Vanilla+ mods, JEM adds more content to every level of vanilla progression, from gravel being craftable using flint, to large, beautiful caverns made of calcite and amethyst. Explore various new biomes, each with their own unique features, blocks, items, and more...
If you want more information on a specific feature in JEM, look at the DOCS (WIP)
To report a bug (by the way, thank you in advance for helping me polish any issues), you can submit a bug report here.
Note: I will be updating this mod regularly (maybe monthly).
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.4
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as jem-1.0-neoforge-1.21.4.jar — drop this file into the mods folder
- Download size: 99 KB
- Download link checked 22 Aug 2026 — working
These come from our own check of the pack file, not from the source page.