Sans AUs (Discontinued)
Undertale fans who also play Minecraft have long wished for a proper crossover, and Sans AUs (Discontinued) was one of the most ambitious attempts at making that wish real. This add-on dropped alternate-universe versions of Sans into the blocky overworld as full boss fights, complete with custom abilities and themed loot. The catch, as the name plainly says, is that the project is no longer being updated, so what you see is what you get. Even so, it remains a fun piece of Undertale history for players who want a challenge with a nostalgic twist.
What Sans AUs (Discontinued) Adds to the Game
At its core, this mod is a boss mod. It does not try to recreate the entire Underground or rebuild Snowdin block by block. Instead, it focuses on a small roster of encounters pulled from Undertale and its fan-made alternate universes, each with its own behavior and rewards. If you have ever wanted to dodge bone attacks in first person while clutching a diamond sword, this is about as close as Minecraft gets.
The Bosses
- Undertale Sans (Incomplete) — the classic version, though the mod's own notes flag him as unfinished, so expect a rougher fight than the others.
- Horrortale Sans — a darker, creepier take on the character, summoned through a specific item rather than found wandering the world.
- Sudden Changes — another AU encounter that rounds out the boss lineup and gives you a reason to prepare properly before engaging.
Items and Abilities
The gear tied to these bosses is where the mod gets interesting. The Horror Axe is the standout: it grants lifesteal, and it increases your movement speed the lower your health drops, which turns desperate, low-HP moments into something almost heroic. Right-clicking with it also teleports you, making it a surprisingly flexible tool for both combat and escape. The Horrific Catalyst is the summoning item for Horrortale Sans, while the Sudden Challenge item brings Sudden Changes into your world. Each one gives the mod a bit of structure instead of dumping bosses on you at random.
Supported Versions and Loaders
Because development stopped, version support is frozen in place. Sans AUs (Discontinued) was built for older releases of Minecraft and is distributed as a Forge mod, so you will need a matching Forge installation rather than Fabric or NeoForge. Before you download Sans AUs (Discontinued), check the version number on the file against your game build. Running it on a newer Minecraft release will almost certainly fail, and there is no maintainer left to patch things up. If you keep a legacy profile around for older mods, this one fits right in.
If you would rather skip the manual file juggling, the foxygame.net launcher handles the setup for you, placing Sans AUs (Discontinued) into a compatible profile with a single click and keeping your other add-ons organized alongside it. That convenience matters more than usual here, since the mod's age makes version matching the trickiest part of the whole process.
How to Install Sans AUs (Discontinued) for Minecraft
Getting the mod running is straightforward as long as you respect the version requirements. Here is the short version of how to install it:
- Install a Forge version of Minecraft that matches the mod's supported release.
- Place the downloaded mod file into your mods folder inside the game directory.
- Launch the Forge profile once so the game generates the necessary files.
- Start a world, craft or obtain the summoning items, and test the bosses in a safe area first.
Keep in mind that "discontinued" means no bug fixes. Some attacks may behave oddly, and the incomplete Sans fight in particular can feel unpolished. Treat those quirks as part of the package rather than something a future update will solve.
Final Thoughts
Sans AUs (Discontinued) for Minecraft is a snapshot of a project that never reached its full potential, but the content it did deliver is genuinely enjoyable. The Horror Axe alone is worth the download for players who like risky, high-reward combat, and fighting AU versions of Sans in a Minecraft world is a novelty that has not really been replicated since. If you can match the right Forge version and accept that the mod is finished for good, it is a worthwhile addition to any Undertale-themed modpack.