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mod

Useful SlimeMinecraft mod for 1.21.1

Adds slime armor and items with cool abilities

client and servernewest supported release 1.21.1AdventureEquipmentTransportation
Latest version
1.12.1
Minecraft
1.12.2 to 1.21.1
Java
Java 21+
Loaders
NeoForge, Forge, Fabric
Licence
LicenseRef-Custom-License
Downloads
585.4k
Updated
20 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Useful Slime servers

One click and Useful Slime is installed with the right loader, on hardware built for it.

  • 1.21.1
  • NeoForge
  • Forge
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version Useful Slime declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge, Forge, Fabric21+declared8 Aug 2024
1.21Fabric, NeoForge, Forge21+declared13 Jun 2024
1.20.4Forge, NeoForge, Fabric17+declared7 Dec 2023
1.20.2Forge, NeoForge, Fabric17+declared20 Sept 2023
1.20.1Fabric, NeoForge, Forge17+declared12 Jun 2023
1.20NeoForge, Forge, Fabric17+declared2 Jun 2023
1.19.4Fabric, NeoForge, Forge17+declared14 Mar 2023
1.19.3Forge, NeoForge, Fabric17+declared7 Dec 2022
1.19.2Forge, NeoForge, Fabric17+declared5 Aug 2022
1.19.1Forge, NeoForge, Fabric17+declared27 Jul 2022
1.19Forge, Fabric, NeoForge17+declared7 Jun 2022
1.18.2NeoForge, Forge, Fabric17+declared28 Feb 2022
1.18.1Fabric, NeoForge, Forge17+declared10 Dec 2021
1.18Forge, NeoForge, Fabric17+declared30 Nov 2021
1.17.1Forge, NeoForge, Fabric16+declared6 Jul 2021
1.16.5Forge, NeoForge, Fabric8+declared14 Jan 2021
1.16.4Forge, NeoForge, Fabric8+declared29 Oct 2020
1.16.3Forge, NeoForge, Fabric8+declared10 Sept 2020
1.16.1Forge, NeoForge, Fabric8+declared24 Jun 2020
1.15.2Forge, NeoForge, Fabric8+declared17 Jan 2020
1.12.2Forge, NeoForge, Fabric8+declared18 Sept 2017

Download

From Useful Slime’s own host. Nothing is re-hosted here.

Browse 26 indexed releases

Most recently published release

1.12.1release9 Mar 2025

UsefulSlime-neoforge-1.21-1.12.1.jar · 0.6 MB · for 1.21.1, 1.21 · NeoForge

Download this release
93fc9fbf6673…
Older versions24
  • 1.12.025 Nov 20241.21.1, 1.210.6 MB3.1k downloadsbd071a3bf98a…Get
  • 1.11.027 Aug 20241.21.1, 1.210.6 MB2.8k downloads592ab2569816…Get
  • 1.10.122 Jul 20241.210.6 MB1.5k downloads4e6ca49c456c…Get
  • 1.10.010 Jul 20241.210.6 MB555 downloadsd06406e85919…Get
  • 1.9.04 Jun 20241.20.40.6 MB576 downloads7be2555ebb2e…Get
  • 1.8.14 Feb 20241.20.1, 1.200.6 MB297 downloads03ff9e230208…Get
  • 1.8.011 Jan 20241.20.20.6 MB212 downloads18236aeb3ce6…Get
  • 1.420 Dec 20231.18.2, 1.18.1, 1.180.1 MB4.2k downloadscbb703a53ef9…Get
  • 1.320 Dec 20231.18.1, 1.180.1 MB331 downloadsdf065221aef4…Get
  • 1.220 Dec 20231.12.286 KB6.7k downloads37bb9d4d70c8…Get
  • 1.120 Dec 20231.16.582 KB266 downloads4b616266e162…Get
  • 1.020 Dec 20231.16.583 KB155 downloadsd02c9bc0c151…Get
  • 1.7.31 Dec 20231.20.20.6 MB280 downloads9c7350441234…Get
  • 1.7.21 Dec 20231.20.2, 1.20.1, 1.200.6 MB3.0k downloadsb1b40465d8e4…Get
  • 1.7.130 Sept 20231.20.2, 1.20.1, 1.200.6 MB2.7k downloads28a5194314b7…Choose file on publisher ↗
  • 1.7.026 Sept 20231.20.2, 1.20.1, 1.200.6 MB142 downloads042262cab3e1…Choose file on publisher ↗
  • 1.6.05 Jul 20231.20.1, 1.200.6 MB3.6k downloadsb0365721eb87…Get
  • 1.5.224 Jun 20231.20.1, 1.200.5 MB183 downloads8e48d86363f2…Get
  • 1.5.119 Jun 20231.20.1, 1.200.1 MB102 downloads6d6797f4b12c…Get
  • 1.5.011 Jun 20231.20.1, 1.200.1 MB123 downloads434b173dab39…Get
  • 1.4.225 May 20231.19.40.1 MB564 downloadsc6af1085c884…Get
  • 1.4.112 Apr 20231.19.40.1 MB147 downloads611bfdeabd75…Get
  • 1.4.022 Mar 20231.19.40.1 MB88 downloads3c2962c96c00…Get
  • 1.3.016 Mar 20231.19.40.1 MB96 downloads44037bf08685…Get

Frequently asked

Does Useful Slime work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Useful Slime declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Useful Slime support?

Everything the author has declared, from 1.12.2 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Useful Slime on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does Useful Slime support?

NeoForge, Forge, Fabric. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Useful Slime?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

What licence is Useful Slime under?

LicenseRef-Custom-License, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Useful Slime?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Useful Slime safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

GeckoLibA 3D animation library for entities, blocks, items, armor, and more!BookshelfAn open source library for other mods!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Jade 🔍Shows information about what you are looking at. (Hwyla/WAILA fork for Minecraft 1.16+)

Details from Modrinth, where the author last updated it on 9 Mar 2025. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .