The Underworld Mod

The Underworld Mod

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

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neoforgeadventure
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Screenshots

Beta 0.1 Items
Underworld Chambers Gameplay
Underworld Chambers
Beta 0.1 Blocks

About this Mod

The Underworld Mod title.

The Underworld Mod is a mod that revolves around a new dungeon made out of new blocks and containing new challenges inside. The dungeon is also the only place you cant find most things added by the mod, including special swords with effects and decorative items.

What does it add?

The Underworld Mod provides the player with a brand new challenge to take on and a journey never before explored. The rewards for managing to survive the Underworld Chambers include, but are not limited to:

Swords

  • The Starter Sword, a basic sword, about a strong as Netherite, that is easily acquirable once arriving at the chambers, its main purpose is to help the players who don't have enough resources have a chance.

  • The Knife, a small dagger that deals few damage, but compensates with its amazing attack speed, that evens out the damage.

  • The Blood Dagger, a blade that gives 10 seconds of the Bleeding effect to whatever entity is hit with it, the bleeding effect deals damage to the entity that has it with time.

  • The Ice Blade, a sword that stuns whatever it hits, giving it the Freezing effect, and making it unable to move, to break or place blocks, and to deal melee damage.

  • The Advanced Sword, a slightly better version of the Starter Sword that is balanced in attack speed and damage, but has no special effects.

  • The Healing Brand, a sword that gives HP to the player whenever it hits an entity with it, and if the entity has more max health than the player, the player gains the entity's max health when hitting it.

  • The Heavy Mallet, a weapon that has very low attack speed, but makes up for it with an extremely high damage that could kill players in one critical hit.

  • The Lightning, an electrical sword that strikes a lightningbolt on whatever entity it hits.

    Swords

Shields

  • The Flaming Hielaman, a shield that sets whatever entity is blocked by it on fire for 15 seconds.

    Flaming Hielaman

What is the plan for the future?

I plan to add even more swords with effects, and make each sword be bounded to a new boss. For example, a new blood boss mob that drops the Blood Dagger, or a new ice boss that drops the Ice Blade. They could spawn as specific rooms in the dungeon and have its own bigger room.

Available Versions

The Underworld Mod 1.0release
MC 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8neoforge
July 20, 2025

How to Install The Underworld Mod on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set neoforge Loader

In the panel under "Egg", select the neoforge loader and matching Minecraft version (1.21.8).

3

Install Mod

Open the mod browser in the dashboard and search for "The Underworld Mod". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

neoforge

Minecraft Versions

1.21.8, 1.21.7, 1.21.6 (+5 more)

Server-side

Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

The Underworld Mod server crashes on startup – what to do?

Most common cause: wrong neoforge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.8). You can switch loaders with one click in the panel.

Is The Underworld Mod compatible with neoforge?

The Underworld Mod officially supports neoforge for Minecraft 1.21.8, 1.21.7, 1.21.6. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with The Underworld Mod – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if The Underworld Mod consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

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Recommended RAM
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Details

License
LicenseRef-All-Rights-Reserved
Server-side
Required

Supported Versions

1.21.81.21.71.21.61.21.51.21.41.21.31.21.21.21.1