Undercraft

Undercraft adds Undertale items and armors into Minecraft, with accurate mechanics!

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neoforgeadventureequipmentgame-mechanics

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About this Mod

Undercraft

All items in the mod.
Undercraft is a mod that adds every single weapon and armor from Undertale into Minecraft, with a new menu (press I) and (mostly) Undertale-accurate FIGHT mechanics!

Weapons

All of your favorite Undertale weapons are in Minecraft! To FIGHT just like Undertale, all you need to do is get any weapon from the mod, hit a mob with it, and then you'll see a bar at the top of the screen! Press Z with the right timing just like Undertale to do some damage.

Armors

All of your favorite Undertale armors are here too (except Temmie Armor)!

Stats Menu (I)

The Stats Menu is a new menu, laid out just like Undertale (with some bonus parts too)!!

Available Versions

Undercraft 1.0.0release

MC 1.21.8neoforge

March 20, 2026

How to Install Undercraft on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set neoforge Loader

In the panel under "Egg", select the neoforge loader and matching Minecraft version (1.21.8).

Install Mod

Open the mod browser in the dashboard and search for "Undercraft". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

neoforge

Minecraft Versions

1.21.8

Server-side

✓ Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Undercraft server crashes on startup – what to do?

Most common cause: wrong neoforge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.8). You can switch loaders with one click in the panel.

Is Undercraft compatible with neoforge?

Undercraft officially supports neoforge for Minecraft 1.21.8. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Undercraft – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Undercraft consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.