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KubeJS Iron's SpellsMinecraft mod for 1.21.1

An addon for KubeJS that allows for creating custom spells, spellbooks, and more from Iron's Spells 'n Spellbooks.

client and servernewest supported release 1.21.1UtilityAdventureMobsLibrary
Latest version
6.5-3.16-r3
Minecraft
1.19.2 to 1.21.1
Java
Java 21+
Loaders
Forge, NeoForge
Licence
MIT
Downloads
281.7k
Updated
18 d ago
Available on
Modrinth
Space NodeOur hosting

Host KubeJS Iron's Spells servers

One click and KubeJS Iron's Spells is installed with the right loader, on hardware built for it.

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

Minecraft versions

Every version KubeJS Iron's Spells declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Forge, NeoForge21+declared8 Aug 2024
1.20.1Forge, NeoForge17+declared12 Jun 2023
1.19.2Forge, NeoForge17+declared5 Aug 2022

Download

From KubeJS Iron's Spells’s own host. Nothing is re-hosted here.

For Minecraft 1.21.1

Choose the loader you use before downloading.

  • NeoForge

    4.0.3 · 26 Dec 2025 · irons_spells_js-4.0.3.jar

    Get NeoForge

Most recently published release

6.5-3.16-r3release17 Oct 2026

irons_spells_js-1.20.1-6.5-3.16-r3-release.jar · 0.3 MB · for 1.20.1 · Forge

Download this release
24bda06eecaf…
Older versions10
  • 6.5-3.16-r216 Oct 20261.20.10.3 MB8f5b13b1fdc9…Get
  • 6.5-3.16-r116 Oct 20261.20.10.3 MB5ef593222635…Get
  • 6.5-3.14-r215 Mar 20261.20.10.3 MB61.7k downloads8a384f2842f7…Get
  • 6.5-3.14-r113 Mar 20261.20.10.3 MB209 downloadsa60191b24681…Get
  • 4.0.326 Dec 20251.21.10.1 MB13.9k downloadsbca6a4efa903…Get
  • 4.0.12 Apr 20251.21.10.1 MB3.9k downloads0a751faa7206…Get
  • 4.0.030 Mar 20251.21.10.1 MB99 downloads629896905fd1…Get
  • 3.1.119 Sept 20241.20.10.1 MB144.2k downloads293c019e7dbc…Choose file on publisher ↗
  • 3.1.016 Sept 20241.20.10.1 MB575 downloads1353b0c31426…Choose file on publisher ↗
  • 3.0.016 Sept 20241.19.20.1 MB604 downloadse232ea78a726…Choose file on publisher ↗

Dependencies

What KubeJS Iron's Spellsdeclares it needs, from the author’s own release metadata. A required one has to be installed alongside it or it will not load.

KubeJSRequired. Edit recipes, add new custom items, script world events, all in JavaScript!Iron's Spells 'n SpellbooksRequired. A magic mod bringing back the classic RPG spellcasting fantasy. (irons spells and spellbooks)

Frequently asked

Does KubeJS Iron's Spells work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version KubeJS Iron's Spells 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 KubeJS Iron's Spells support?

Everything the author has declared, from 1.19.2 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 KubeJS Iron's Spells 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 KubeJS Iron's Spells support?

Forge, NeoForge. 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 KubeJS Iron's Spells?

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 does KubeJS Iron's Spells need to run?

It declares KubeJS and Iron's Spells 'n Spellbooks as required, so those have to be installed alongside it or it will not load. Each one is linked in the dependencies section above.

What licence is KubeJS Iron's Spells under?

MIT, 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 KubeJS Iron's Spells?

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 KubeJS Iron's Spells 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.Enchantment DescriptionsAdds in-game descriptions for enchantments to tooltips.

Details from Modrinth, where the author last updated it on 17 Oct 2026. 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? .