The Underworld: Special Dungeons & Swords

A dungeon mod that adds a new massive dungeon made out of custom blocks + new swords with special effects.

Which Minecraft do you have?

Every version of the game needs its own build. Pick yours, then download — the wrong build installs fine and then does nothing in the game. This mod is built for NeoForge only.

Minecraft 1.21.4Newest
Minecraft 1.21.1

⬇ Download for 1.21.4 ⬇ Download for 1.21.1

I don't know my version or loader

Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.

No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.

Open in MCModsHub Get it on Google Play →

The Underworld: Special Dungeons & Swords — screenshot 1

The Underworld: Special Dungeons & Swords — screenshot 2

The Underworld: Special Dungeons & Swords — screenshot 3

Verified by MCModsHub

Ships as the_underworld_mod_pre-release_2_neoforge_1.21.4.jar — drop this file into the mods folder
Download size: 1.6 MB
Download link checked 18 Aug 2026 — working

These come from our own check of the pack file, not from the source page.

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