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HephaestusMinecraft mod for 1.21.4

Become the best blacksmith and craft strong tools.

client and servernewest supported 1.21.4EquipmentGame Mechanics
Latest version
3.0.4
Minecraft
1.21.1 to 1.21.4
Java
Java 21+
Loaders
Fabric, Quilt
Licence
LicenseRef-
Downloads
3.5k
Updated
4 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Hephaestus servers

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

  • 1.21.4
  • Fabric
  • Quilt
  • 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 Hephaestus declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.4Fabric, Quilt21+declared3 Dec 2024
1.21.3Fabric, Quilt21+declared23 Oct 2024
1.21.2Fabric, Quilt21+declared22 Oct 2024
1.21.1Fabric, Quilt21+declared8 Aug 2024

Download

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

3.0.4release3 Jun 2026

hephaestus-3.0.4.jar · 0.1 MB · for 1.21.1

Download latest
0bbd661f66c7…
Older versions14
  • 3.0.31 Apr 20261.21.10.1 MB310 downloads7d375aa85f08…Get
  • 3.0.213 Mar 20261.21.10.1 MB145 downloadsad0319460de2…Get
  • 3.0.18 Mar 20261.21.10.1 MB38 downloads7a03e53659a8…Get
  • 3.0.06 Mar 20261.21.10.1 MB31 downloadsb57c23147b66…Get
  • 2.2.527 Jul 20251.21.10.2 MB788 downloads30333860b9a3…Get
  • 2.2.413 Jul 20251.21.10.2 MB83 downloadsf5457019ab0e…Get
  • 2.2.32 May 20251.21.10.1 MB227 downloads97fd887e3fe7…Get
  • 2.1.226 Jan 20251.21.4, 1.21.3, 1.21.2, 1.21.10.1 MB382 downloadse5c9101ed79e…Get
  • 2.0.018 Jan 20251.21.179 KB91 downloadsbd6e1895eb73…Get
  • 1.4.728 Dec 20241.21.10.2 MB116 downloads8262f04de638…Get
  • 1.4.64 Dec 20241.21.10.2 MB100 downloads2440b6bd76c6…Get
  • 1.4.527 Nov 20241.21.10.2 MB66 downloadsc47b577616da…Get
  • 1.4.117 Nov 20241.21.10.2 MB90 downloadsb3cee1c1328a…Get
  • 1.0.021 Oct 20241.21.150 KB52 downloads74f40cdb0a59…Get

Frequently asked

Does Hephaestus work on Minecraft 1.21.4?

Yes. 1.21.4 is the newest Minecraft version Hephaestus 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 Hephaestus support?

Everything the author has declared, from 1.21.1 up to 1.21.4. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Hephaestus 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 Hephaestus support?

Fabric, Quilt. 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 Hephaestus?

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.

What licence is Hephaestus under?

LicenseRef-, 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 Hephaestus?

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 Hephaestus 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. 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.

Armor HiderHide or adjust the transparency of armor, glint, and offhand items - with full multiplayer sync. No dependencies required.Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftArchitectury 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+)Collective🎓 Collective is a shared library with common code for all of Serilum's mods.AttributeFixRemoves arbitrary limits on Minecraft's attribute system.

Details from Modrinth, where the author last updated it on 3 Jun 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? .