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Fundamental Principles - Iron's Spells AddonMinecraft mod for 1.21.1

Adds mechanics, balance and progression to the Iron's Spells n Spellbooks magic system.

newest supported 1.21.1MagicAdventure RpgMc AddonsWorld Mobs
Latest version
fundamental_principles_v_1.1.7.1.jar
Minecraft
1.21.1
Java
Java 21+
Loader
NeoForge
Licence
not stated
Downloads
5.1k
Updated
2 mo ago
Available on
CurseForge

Screenshots

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

Minecraft versions

Every version Fundamental Principles - Iron's Spells Addon declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge21+declared8 Aug 2024

Download

From Fundamental Principles - Iron's Spells Addon’s own host. Nothing is re-hosted here.

fundamental_principles_v_1.1.7.1.jarrelease2 Aug 2026

ypfundamentals-1.1.7.1.jar · 0.8 MB · for 1.21.1

Download latest
a2855c253202…
Older versions21
  • fundamental_principles_v_1.1.7.jar6 Jul 20261.21.10.8 MB82 downloads3b600781b12c…Get
  • fundamental_principles_v_1.1.6.jar16 May 20261.21.10.7 MB1.7k downloads1b775565ffce…Get
  • fundamental_principles_v_1.1.5.jar24 Apr 20261.21.10.6 MB589 downloads5411e57c620c…Get
  • fundamental_principles_v_1.1.4.jar27 Mar 20261.21.10.5 MB22 downloads7b3938dc7a55…Get
  • fundamental_principles_v_1.1.3.jar18 Mar 20261.21.10.5 MB117 downloads39e0279cffe2…Get
  • fundamental_principles_v_1.1.2.jar5 Mar 20261.21.10.5 MB186 downloads0659ec4cae15…Get
  • fundamental_principles_v_1.1.1.jar16 Feb 20261.21.10.5 MB127 downloads99c03d03cea1…Get
  • fundamental_principles_v_1.1.0.jar24 Jan 20261.21.10.4 MB216 downloadsf7c075b7ce03…Get
  • fundamental_principles_v_1.0.2.jar8 Jan 20261.21.10.4 MB33 downloads7d17c0acd4d8…Get
  • fundamental_principles_v_1.0.1.jar7 Jan 20261.21.10.4 MB14 downloadsf2062bf8b3e3…Get
  • fundamental_principles_v_1.0.0.jar7 Jan 20261.21.10.4 MB9 downloads6679e01ab136…Get
  • fundamental_principles_v_0.9.0.jar29 Dec 20251.21.10.4 MB20 downloads1ec22fdfd9bd…Get
  • fundamental_principles_v_0.8.0.jar20 Dec 20251.21.10.4 MB21 downloads7e7cea644191…Get
  • fundamental_principles_v_0.7.0.jar4 Dec 20251.21.10.4 MB32 downloads01ac8faa794e…Get
  • fundamental_principles_v_0.6.1.jar8 Nov 20251.21.10.4 MB9 downloadsb1bdad16583b…Get
  • ypfundamentals-0.0.6.jar28 Oct 20251.21.10.4 MB39 downloadsa48b2ec25b25…Get
  • ypfundamentals-0.0.5.jar14 Oct 20251.21.10.3 MB14 downloads28e181289423…Get
  • ypfundamentals-0.0.4.jar9 Oct 20251.21.10.3 MB12 downloads5484081aaf30…Get
  • ypfundamentals-0.0.3.jar3 Oct 20251.21.10.3 MB15 downloads277d3ee16710…Get
  • ypfundamentals-0.0.2.jar16 Sept 20251.21.10.3 MB11 downloads5e01aecd832c…Get
  • ypfundamentals-0.0.1.jar15 Sept 20251.21.10.3 MB1 download462be259e4ac…Get

Frequently asked

Does Fundamental Principles - Iron's Spells Addon work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Fundamental Principles - Iron's Spells Addon 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 platform or loader does Fundamental Principles - Iron's Spells Addon support?

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 Fundamental Principles - Iron's Spells Addon?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

How do I install Fundamental Principles - Iron's Spells Addon?

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 Fundamental Principles - Iron's Spells Addon safely?

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

Works on the same versions

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

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Details from CurseForge, where the author last updated it on 2 Aug 2026. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .