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MermodMinecraft mod for 1.21.11

Mermod adds a magical necklace that transforms you into a merperson in water!

client and servernewest supported release 1.21.11AdventureMagic
Latest version
4.0.2-neoforge+1.21.11
Minecraft
1.16.5 to 1.21.11
Java
Java 21+
Loaders
NeoForge, Forge, Fabric
Licence
MPL-2.0
Downloads
2.5M
Updated
3 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Mermod servers

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

  • 1.21.11
  • NeoForge
  • Forge
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

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

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.11NeoForge, Forge, Fabric21+declared9 Dec 2025
1.21.4Fabric, NeoForge, Forge21+declared3 Dec 2024
1.21.1Fabric, NeoForge, Forge21+declared8 Aug 2024
1.20.6NeoForge, Forge, Fabric21+declared29 Apr 2024
1.20.4Fabric, NeoForge, Forge17+declared7 Dec 2023
1.20.2Forge, NeoForge, Fabric17+declared20 Sept 2023
1.20.1Forge, Fabric, NeoForge17+declared12 Jun 2023
1.19.4NeoForge, Forge, Fabric17+declared14 Mar 2023
1.19.3Fabric, NeoForge, Forge17+declared7 Dec 2022
1.19.2Forge, NeoForge, Fabric17+declared5 Aug 2022
1.18.2Forge, NeoForge, Fabric17+declared28 Feb 2022
1.17.1Forge, NeoForge, Fabric16+declared6 Jul 2021
1.16.5Forge, NeoForge, Fabric8+declared14 Jan 2021

Download

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

Browse 41 indexed releases

For Minecraft 1.21.11

Choose the loader you use before downloading.

  • NeoForge

    4.0.2-neoforge+1.21.11 · 9 Aug 2026 · mermod-neoforge-4.0.2+1.21.11.jar

    Get NeoForge

  • Fabric

    4.0.2-fabric+1.21.11 · 9 Aug 2026 · mermod-fabric-4.0.2+1.21.11.jar

    Get Fabric

Most recently published release

4.0.2-neoforge+1.21.11release9 Aug 2026

mermod-neoforge-4.0.2+1.21.11.jar · 0.2 MB · for 1.21.11 · NeoForge

Download this release
4c4d2cdc702f…
Older versions24
  • 4.0.2-fabric+1.21.119 Aug 20261.21.110.7 MBc8356feb09a6…Get
  • 3.0.3-fabric+1.20.19 Aug 20261.20.10.5 MBee06000e81b4…Get
  • 3.0.3-forge+1.20.19 Aug 20261.20.10.3 MBf0a2a8ea220d…Choose file on publisher ↗
  • 4.0.1-fabric+1.21.1118 Mar 20261.21.110.7 MB6.2k downloads84b77fd65c81…Get
  • 4.0.1-neoforge+1.21.1118 Mar 20261.21.110.2 MB1.0k downloadseb29fcfa3480…Get
  • 3.0.2-fabric+1.20.116 Mar 20261.20.10.5 MB9.8k downloads28e007240863…Get
  • 3.0.2-forge+1.20.116 Mar 20261.20.10.3 MB26.6k downloads20063e21b5c1…Choose file on publisher ↗
  • 4.0.0-neoforge+1.21.1116 Mar 20261.21.110.2 MB69 downloadscc7d71e24f3b…Get
  • 4.0.0-fabric+1.21.1116 Mar 20261.21.110.7 MB238 downloads9f63d3798f0b…Get
  • 3.3.27 Sept 20251.21.10.2 MB15.9k downloadsb8bd1894f601…Get
  • 3.4.06 Sept 20251.21.40.2 MB1.5k downloads31063e4d1f97…Get
  • 3.3.130 Jan 20251.21.10.1 MB14.5k downloads88e816c43f6a…Get
  • 3.2.130 Jan 20251.20.60.2 MB335 downloadsdd77fb3f3046…Get
  • 3.3.030 Jan 20251.21.10.1 MB157 downloadsd1ac4d96497c…Get
  • 3.2.029 Jan 20251.20.60.5 MB73 downloadsf3be52a7879e…Get
  • 3.1.015 Oct 20241.20.40.1 MB1.1k downloadsf65e55efb8b3…Get
  • 3.0.131 Jul 20241.20.10.3 MB800.7k downloads9e4f1b563311…Choose file on publisher ↗
  • 3.0.016 Jun 20241.20.10.5 MB759 downloadsfcd1b235cb5e…Get
  • 2.4112 Nov 20231.20.10.2 MB34.5k downloadscefaca034cdf…Get
  • 2.45 Aug 20231.20.10.2 MB1.6k downloads334f8f13ac48…Get
  • 1.45 Aug 20231.20.10.1 MB70 downloadsa86d71e0f42b…Get
  • 1.217 Jun 20231.16.50.1 MB60 downloadsd74f0b75e9be…Get
  • 2.3214 Jun 20231.19.40.2 MB613 downloads06311e665181…Get
  • 1.39 May 20231.19.40.1 MB62 downloadsf9bd56e2daae…Get

Dependencies

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

Fabric APIRequired. Lightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.Architectury APIRequired. An intermediary api aimed to ease developing multiplatform mods.Cloth Config APIOptional. Configuration Library for Minecraft ModsCurios APIOptional. A flexible and expandable accessory/equipment API for users and developers.TrinketsOptional. A data-driven accessory modOriginsOptional. Players choose an Origin at the beginning of the game to gain benefits and drawbacksFiguraOptional. A client-side mod that allows for extensive customization of the player model.Trinkets UpdatedOptional. A modern data driven accessory mod. Updated fork of trinkets for 1.21.11 and beyond.

Frequently asked

Does Mermod work on Minecraft 1.21.11?

Yes. 1.21.11 is the newest Minecraft version Mermod 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 Mermod support?

Everything the author has declared, from 1.16.5 up to 1.21.11. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Mermod 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 Mermod 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 Mermod?

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 Mermod need to run?

It declares Fabric API and Architectury API 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 Mermod under?

MPL-2.0, 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 Mermod?

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 Mermod 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!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+)Collective🎓 Collective is a shared library with common code for all of Serilum's mods.

Details from Modrinth, where the author last updated it on 9 Aug 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? .