Undertale

What is Undertale?

Undertale is a Fabric modpack for Minecraft 1.21, published by Clouser on Modrinth since 2024.

The latest release, 0.0.5 from May 23, 2025, declares 36 mods plus 1 other project such as resource packs or shaders. It has 3 published versions.

With 175K downloads it ranks #121 of the 518 most-downloaded Modrinth modpacks we track, and its authors tag it as adventure, challenging and combat.

• Adventure
• Challenging
• Combat

Most widely used mods in Undertale

The latest version declares 37 projects, 36 of them mods. The ones below appear in the most packs we track.

• Cloth Config API
• FerriteCore
• Sodium
• Fabric API
• ImmediatelyFast
• Lithium
• Iris Shaders
• Architectury API
• Fabric Language Kotlin
• [ETF] Entity Texture Features
• [EMF] Entity Model Features
• Sodium Extra
• Konkrete
• ModernFix
• Geckolib
• Continuity
• Text Placeholder API
• Melody
• FancyMenu
• Chat Heads
• Indium
• Model Gap Fix
• Enhanced Block Entities
• Cardinal Components API

Full Undertale mod list

2 more files are bundled inside the pack without a Modrinth project, so we cannot name them.

How its mod list compares

Less common picks: 8 mods found in five or fewer tracked packs.

• Clouser settings locker
• Command Block IDE
• Lambda
• Slyde More
• Skip backup screen
• Slyde
• Menu Music
• Sodium Core Shader Support

Packs with the most mods in common

• Plants vs. Zombies Fabric for 1.21 14 mods in common
• Fresh Animations out of the box Fabric for 1.21 15 mods in common
• Crystal Client Fabric for 26.3 15 mods in common
• Simply Optifine Fabric for 1.21 16 mods in common
• Haste Fabric for 1.21.1 14 mods in common

What kinds of mods are in Undertale?

Of its 36 mods, 21 are tagged utility, 11 library and 10 optimization. Mods can carry several tags, so the counts overlap.

At 11% cursed, that is a larger share than 98% of the 491 packs we track.

• utility: 21 (58%)
• library: 11 (31%)
• optimization: 10 (28%)
• cursed: 4 (11%)
• decoration: 4 (11%)
• game mechanics: 3 (8%)

How big is Undertale?

With 36 mods, Undertale has fewer mods than 63% of the 491 packs we track and fewer mods than 67% of the 12 on Minecraft 1.21.

The pack file is 92.3 MB. 18 mods are client-only and 16 also run on a server. Alongside the mods it declares 1 shader.

How actively is Undertale updated?

Undertale was first published on Jan 2, 2024, and has 3 published versions in total.

The latest release, 0.0.5, is dated May 23, 2025, 537 days before our data was fetched on Nov 11, 2026. Releases have covered 1 Minecraft version over 1.4 years.

Staple mods Undertale includes and leaves out

Across the 325 Fabric packs we track, 15 mods turn up most often. Undertale includes 11 of them; it leaves out Mod Menu, Entity Culling, YetAnotherConfigLib (YACL) and Reese's Sodium Options.

How much RAM does Undertale need?

Undertale needs 4 GB allocated (3 GB minimum). Our estimate from the 36-mod list, not measured.

How to set allocated memory

How to install Undertale

Search for "Undertale" in the Modrinth source of your launcher. Pick version 0.0.5 for Minecraft 1.21 (Fabric). Modpack install guide.

How do I make an Undertale server?

Undertale is marked as needing a server-side install, so the server must run the same mods and version as the players.

• Match the version: the latest pack version is 0.0.5 for Minecraft 1.21.
• Loader: Fabric.
• Memory: at least 3 GB (our estimate).

Modpack server guide.

Versions

One build.

Official links

• Undertale on Modrinth (downloads and changelog)
• Source code
• Issue tracker

Facts on this page come from Modrinth's public API, last fetched Nov 11, 2026. Descriptive text is our own. Spotted an error, or are you the author and want something changed? See disclaimer and takedowns.