Jeff: The Awoken Core
Face Jeff, a late-game raid boss who tests your skill, strategy, and timing to earn powerful loot and master Minecraft combat
⬇ Download on Modrinth
Jeff: The Awoken Core
A boss encounter mod built for Fabric 1.21.8
This mod is currently in early testing. Some mechanics, visuals, and loot systems may change as features may be added or changed.
Feedback and bug reports are welcome — contact me (GunjiCord) in my Discord if you need any help:
(If that link doesnt work then there should be one in my youtube bio that does: YT is GunjiCord)
How to help test:
Make sure you’re in a flat, open area.
Run the command: /summonarena
The fletching table acts as the entry/exit point
Entering will automatically spawn Jeff, The Awoken Core at its center.
You’ll be given three unique shields — Blue, Green, and Red — used to block different types of attacks. From there you should be able to figure out the rest of the fight :)
Requirements
Fabric Loader 0.17.2 or newer
Minecraft 1.21.8
Fabric API
GeckoLib 5.x
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.8
- 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 bossmod1-1.0.0.jar — drop this file into the mods folder
- Download size: 95 KB
- Download link checked 21 Aug 2026 — working
These come from our own check of the pack file, not from the source page.