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TheUndergrowthMinecraft mod for 1.21.1

To enhance the overworld(and end) without adding biomes, but instead reworking the already existing ones

client and servernewest supported release 1.21.1UtilityAdventureEquipmentDecoration
Latest version
1.5
Minecraft
1.21.1
Java
Java 21+
Loader
NeoForge
Licence
LicenseRef-All-Rights-Reserved
Downloads
1.7k
Updated
1 mo ago
Available on
Modrinth
Space NodeOur hosting

Host TheUndergrowth servers

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

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

Minecraft versions

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

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge21+declared8 Aug 2024

Download

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

Most recently published release

1.5release20 Jun 2026

the_undergrowth-1.5-neoforge-1.21.1.jar · 29.8 MB · for 1.21.1 · NeoForge

Download this release
90bb79d98cdc…
Older versions4
  • 1.414 Jul 20251.21.111.0 MB397 downloads77b9ee8e9798…Get
  • 1.324 Jun 20251.21.111.2 MB102 downloads31d5f06536ce…Get
  • 2.017 Apr 20251.20.111.0 MB447 downloadseeed274821c0…Get
  • 1.221 Mar 20251.20.110.9 MB163 downloads852b571c2633…Get

Frequently asked

Does TheUndergrowth work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version TheUndergrowth declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Do I need to install TheUndergrowth 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 TheUndergrowth 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 TheUndergrowth?

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 licence is TheUndergrowth under?

LicenseRef-All-Rights-Reserved, 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 TheUndergrowth?

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 TheUndergrowth 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.

BookshelfAn open source library for other mods!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.Enchantment DescriptionsAdds in-game descriptions for enchantments to tooltips.

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