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SLM: CodexMinecraft mod for 1.21.1

Add a Codex system with Skills, Passives, Actives, Lore, etc. for Items, Weapons, Armor & Curios

newest supported 1.21.1Utility QolCosmeticLibrary ApiMc Addons
Latest version
SLM-Codex-1.4-1.20.1+[Forge].jar
Minecraft
1.20.1 to 1.21.1
Java
Java 21+
Loaders
Forge, NeoForge
Licence
not stated
Downloads
276.3k
Updated
2 mo ago
Available on
CurseForge

Minecraft versions

Every version SLM: Codex 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

Download

From SLM: Codex’s own host. Nothing is re-hosted here.

SLM-Codex-1.4-1.20.1+[Forge].jarrelease26 Jul 2026

SLM-Codex-1.4-1.20.1+[Forge].jar · 0.2 MB · for 1.20.1

Download latest
9254d4431212…
Older versions9
  • SLM-Codex-1.4-1.21.1+[NeoForge].jar22 Jul 20261.21.10.2 MB93 downloadseb49a89dce2b…Get
  • SLM-Codex-1.3-1.20.1+[Forge].jar28 May 20261.20.10.2 MB635 downloads7baec16445d4…Get
  • SLM-Codex-1.3-1.21.1+[NeoForge].jar23 May 20261.21.10.2 MB32 downloads3008c0f102b4…Get
  • SLM-Codex-1.2-1.21.1+[NeoForge].jar22 Apr 20261.21.10.2 MB7 downloads41038a8c0fdf…Get
  • SLM-Codex-1.1.1-1.20.1+[Forge].jar22 Apr 20261.20.10.2 MBb4ba1f7f4f90…Get
  • SLM-Codex-1.1-1.20.1+[Forge].jar20 Apr 20261.20.10.2 MB18 downloadsa1eaf44e6ec5…Get
  • SLM-Codex-1.1-1.21.1+[NeoForge].jar16 Apr 20261.21.10.2 MB7 downloads436a03d3b38b…Get
  • SLM-Codex-1.0-1.20.1+[Forge].jar3 Apr 20261.20.10.2 MB14 downloads27218e2c3c5b…Get
  • SLM-Codex-1.0-1.21.1+[NeoForge].jar3 Apr 20261.21.10.2 MB1 downloads181f46712ba6…Get

Frequently asked

Does SLM: Codex work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version SLM: Codex 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 SLM: Codex support?

Everything the author has declared, from 1.20.1 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does SLM: Codex 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 SLM: Codex?

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 SLM: Codex?

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 SLM: Codex 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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Last checked 1 mo ago against CurseForge. 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? .