UnderMine AU's Additions
Thanks for 200+ downloads! A mod that adds UNDERTALE & UNDERTALE AU related bosses. Every boss has unique abilities. At the moment there is 10+ bosses…
⬇ Download on CurseForgeThe author built this one for Minecraft 1.20.1 on Forge. On other versions it may install and then do nothing.
Thanks for 200+ downloads!
A mod that adds UNDERTALE & UNDERTALE AU related bosses.
Every boss has unique abilities. At the moment there is 10+ bosses.
List of current bosses : Classic Sans, Classic Papyrus, Swap Sans, Swap Papyrus, Fell Sans, Fell Papyrus, Killer Sans, SwapFell Sans, SwapFell Papyrus, Dust Sans, Last Breath Sans and more.
There is no items in the mod currently.
All the bosses currently rarely spawn in snowy taiga
Suggest mobs you would like to see in the mod. Only UNDERTALE & UNDERTALE AU's.
Mod needs Geckolib to work.
Mod created using MCreator
I do not own any of these AU's, they belong to their respective creators.
UNDERTALE by Toby Fox.
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.20.1
- 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 CurseForge — 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 undermine_aus_additions-0.25-forge-1.20.1.jar — drop this file into the mods folder
- Download size: 1.1 MB
- Download link checked 13 Sept 2026 — working
These come from our own check of the pack file, not from the source page.