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Undermod Wiki & Guide

Java EditionMod

Adds underground cave decorations including stalactites, damp bricks, and unique fungi blocks.

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Contents (8)
  1. Guides
  2. Processes
  3. Items
  4. Blocks
  5. Mobs
  6. Enchantments
  7. Frequently asked questions

Guides

Step-by-step, in-game.

Finding and Entering Ancient SewersLocating Sewer Entrances Ancient Sewers spawn beneath villages, so your first step is finding a village on the…Mining Ores and Resources UndergroundBest Biomes for Resources Different underground biomes offer different rewards: Underground Forests : Rich in coal…Navigating Connected Underground PassagesUnderstanding the Network UnderMod's underground biomes are linked together—sewers connect to underground rivers,…Using Underground Rivers for Fast TravelPreparing Your Boat Craft a boat before entering underground rivers. These waterways stretch across the map and…

Recipes

Every recipe the mod adds, grouped by how it is made.

Crafting · 8minecraft:stonecutting · 5minecraft:smelting · 1

Items

Heap of FilthLeech Spawn EggLeech ToothLost KeyMusic DiscOccult Hand MirrorOld KeyRat Spawn EggStrange Key

Blocks

ABCDGLMSTU

A

Andesite Stalactite

B

Black Veil MushroomBlack Veil Mushroom BlockBlock of Filth

C

Cracked Damp Bricks

D

Damp Brick SlabDamp Brick StairsDamp BricksDamp Bricks with HoleDamp CobblestoneDamp Cobblestone SlabDamp Cobblestone StairsDiorite Stalactite

G

Granite Stalactite

L

Large Andesite StalactiteLarge Diorite StalactiteLarge Granite StalactiteLarge Stone StalactiteLeech Head

M

Moldy Damp Brick StairsMoldy Damp Bricks

S

Small BarrelStoneStone Stalactite

T

Thin Andesite StalactiteThin Diorite StalactiteThin Granite StalactiteThin Stone Stalactite

U

Understeel DoorUndersteel FenceUndersteel Trapdoor

Mobs

Creatures this mod adds.

LeechRat

Enchantments

Enchantments this mod adds.

Life Leech

Frequently asked questions

How do I find an Ancient Sewer entrance?
Ancient Sewers spawn directly beneath villages as hidden openings in the ground. Look around village structures at ground level for small dark openings or collapsed sections that lead downward into flooded tunnels.
Do Underground Forests spawn everywhere or only under certain forests?
Underground Forests generate specifically beneath regular surface forests where sinkholes create natural entry points. These sinkholes let sunlight filter down, making them easier to spot than other underground biome entrances.
Can I use boats to travel through Underground Rivers?
Yes, Underground Rivers are designed for safe boat travel and connect different cave systems together. They function like normal water channels but run deep underground, making them useful for long-distance exploration without combat.
Will this mod break my existing world or create chunk borders?
No, UnderMod is designed with smooth world blending to adapt to existing save files without creating ugly chunk borders or requiring a new world.
What dangerous mobs spawn in the Ancient Sewers?
Ancient Sewers contain bandits, slimes, and other hostile creatures suited to flooded underground environments. The poisonous water in these areas adds an additional hazard beyond the mobs themselves.
Are there rare ores in Underground Forests?
Yes, Underground Forests are rich with coal and rare ores, making them valuable mining locations. The sinkholes that let sunlight in also make these biomes easier to navigate than completely dark caves.
How do Giant Craters form and what do I find in them?
Giant Craters are created by meteor strikes that blast deep holes into the earth, exposing deep caves and valuable space rocks. These craters provide access to otherwise unreachable underground areas.
Does Undermod work with other world generation mods?
Yes, UnderMod is designed to work perfectly alongside other world generation mods without conflicts or compatibility issues.
Will this mod cause lag or performance problems?
No, UnderMod uses an optimized generation engine specifically designed to keep lag low while generating complex underground biomes.
Can I travel between different underground biomes through connected passages?
Yes, the mod procedurally links faraway underground areas together—for example, sewers connect to underground rivers and other cave systems—allowing you to explore a fully interconnected underground world.