Modscraper Modscraper Minecraft
The Lost Underground logo

The Lost Underground

Modpack

by Legundo

Can you survive and never see the sun?

Type

Modpack

CurseForge Downloads

4,676

CurseForge ID

1186101

Last Updated

Jun 5, 2026

Description

I Survived 100 Days in the lost underground, and now you can too!

This is my latest multiverse adventure, a world of clashing dinosaurs, radioactive abominations, and... Unicorns and Candy?!?! Don't even get me started on the Sculk too... This Caves Only world is a nail biting adventure from beginning to end... and it ends with a BANG.

PLEASE NOTE

Due to the way this world generates (by default with the Lithospherical world type) - certain Alex's Caves structures will not generate. This includes the Primordial Volcano, Candy Cavity witche's tower, and the Abyssal Caves biome entirely. Due to this, some Alex's Caves bosses will be unavailable.

This modpack works entirely on it's own, but to download my specific map from the video, support me on Patreon!
https://patreon.com/Legundo

 

This modpack is as featured in my Hardcore 100 Days video!

Compatibility

Mod Loaders

Forge

Game Versions

1.20.1

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Xaero's World Map

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Sophisticated Backpacks

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FerriteCore ((Neo)Forge)

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Patchouli

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Embeddium

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Polymorph (Fabric/Forge/Quilt)

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Mod 226,054,670
Framework

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Mod 119,022,245
Carry On

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Carry On allows you to pick up Tile Entities and Mobs and carry them around!

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Create

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Resourceful Config

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YUNG's API (Forge/NeoForge)

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Packet Fixer

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Mod 115,532,218
Alex's Mobs

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Mod 155,955,827
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Artifacts

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Caelus API

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TerraBlender (Forge)

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Mod 174,325,801
Server Performance - Smooth Chunk Save[Forge/Fabric]

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Enables lag-free continuous chunk saving, increasing server TPS

Mod 108,988,599
Configured

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NetherPortalFix

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Just Enough Resources (JER)

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fix GPU memory leak[Forge/Fabric]

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YUNG's Better Nether Fortresses (Forge/NeoForge)

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Necronomicon API

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Just Enough Professions (JEP)

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Loot Integrations

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Mod 71,650,219
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Mod 79,878,181
Relics

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Elytra Slot

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Mod 121,820,599
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Chunk Sending[Forge/Fabric]

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Mod 62,943,134
YUNG's Better Witch Huts (Forge/NeoForge)

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Mod 76,902,770
YUNG's Better Jungle Temples (Forge/NeoForge)

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Mod 81,565,795
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Mod 75,492,426
Easy Magic

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Mod 80,537,762
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Mod 43,071,095
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Mod 70,815,439
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Mod 92,117,535
YUNG's Bridges (Forge/NeoForge)

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Mod 76,805,783
Cobweb

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Mod 32,209,114
Chloride (Embeddium++/Sodium++)

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Mod 46,510,043
CullLessLeaves Reforged (Unofficial)

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Gives you a 9% fps improvement for leaves rendering

Mod 35,536,770
YUNG's Extras (Forge/NeoForge)

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Mod 73,453,151
Alex's Delight

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Mod 43,123,602
Boat Break Fix [Neo/Forge/Fabric/Quilt]

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Mod 43,251,572
Reliquified Artifacts

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Mod 23,594,629
Trading Post

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Rule the village! Trade with every villager at once!

Mod 61,162,352
MonoLib

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A non-invasive library mod for Fabric, Forge, and NeoForge.

Mod 26,287,333
Alex's Caves

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Mod 37,377,941
Just Enough Archaeology

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Mod 27,443,908
Nether's Delight

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Mod 75,029,687
Yung Structures Addon for Loot Integrations

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Adds better loot to yung mods structures, an addon to the lootintegrations mod

Mod 20,703,371
Starlight (Forge)

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Rewrites the light engine to fix lighting performance and lighting errors

Mod 53,342,593
YUNG's Cave Biomes (Forge/NeoForge)

YUNG's Cave Biomes (Forge/NeoForge)

Adds new vanilla+ cave biomes and underground content!

Mod 20,296,849
Friends&Foes (Forge/NeoForge)

Friends&Foes (Forge/NeoForge)

Adds outvoted and forgotten mobs from the mob vote, expanding on their original concepts and adding new vanilla-like fea...

Mod 41,837,341
Illager Invasion

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The illagers are back! Be ready to fight new foes. A port of Illager Expansion.

Mod 34,801,426
Incendium

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Mod 40,231,429
Galosphere

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Mod 35,272,404
Bartering Station

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Mod 42,959,767
YUNG's Menu Tweaks (Forge/NeoForge)

YUNG's Menu Tweaks (Forge/NeoForge)

A small, lightweight mod that makes browsing menus a lot easier

Mod 22,540,012
DEUF - Duplicate Entity UUID Fix

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Changes UUIDs of loaded Entities in case their UUIDs are already assigned (and removes log spam).

Mod 30,219,219
Bygone Nether

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Mod 48,659,349
Create Stuff 'N Additions

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Mod 32,379,567
Radiant Gear (Fabric/Forge/Quilt)

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Mod 19,434,116
Harvest with ease

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Don't break crops, right click them!

Mod 33,058,919
DnT Ancient City Overhaul

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Standalone Splinter version of Dungeons and Taverns Ancient City Overhaul

Mod 12,752,175
Stay True

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Texture Pack 42,965,657
Complementary Shaders - Reimagined

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Shader 205,029,325
Underground Villages

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Mod 13,939,086
More Mob Variants

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Mod 27,592,193
Dynamic Lights

Dynamic Lights

portable and moving lightsources

Mod 32,036,418
Noisium (archived)

Noisium (archived)

Optimises worldgen performance for a better gameplay experience.

Mod 64,694,411
Enemy Expansion

Enemy Expansion

Adding variety to combat encounters in Minecraft!

Mod 7,598,539
Adaptive Performance Tweaks: Core

Adaptive Performance Tweaks: Core

The core is required for all adaptive performance tweaks modules and provides a shared API, monitoring functionally, eve...

Mod 12,108,486
Adaptive Performance Tweaks: Items

Adaptive Performance Tweaks: Items

Item clustering (fallen blocks, experience orbs, ...) and garbage cleanup.

Mod 9,894,565
Curious Lanterns

Curious Lanterns

Provides a hip slot for your illuminated mining needs! Requires a dynamic lights mod.

Mod 11,559,980
Relics: Alex's Mobs Compat

Relics: Alex's Mobs Compat

Compatibility addon between Relics and Alex's Mobs

Mod 8,744,826
Miner's Delight +

Miner's Delight +

Farmer's Delight add-on for miners

Mod 15,501,340
Villagers Sell Animals [NoCube's Mods]

Villagers Sell Animals [NoCube's Mods]

Adds new villager deals. Makes animals renewable. Vanilla-style

Mod 7,482,609
Relics: Alex's Caves Compat

Relics: Alex's Caves Compat

Compatibility addon between Relics and Alex's Caves

Mod 6,430,490
Alex's Caves Delight

Alex's Caves Delight

Adds compatibility between Alex's Caves and Farmer's Delight. Vanilla style.

Mod 3,224,236
Alex's Caves: Stuff & Torpedoes

Alex's Caves: Stuff & Torpedoes

💥Adds torpedoes and equipment related to Alex's Caves

Mod 3,537,334
TACT - Tiny Alex's Caves Tweaks

TACT - Tiny Alex's Caves Tweaks

Tiny Alex's Caves Tweaks to make the mod a bit better

Mod 11,447,399
More Minecarts and Rails

More Minecarts and Rails

Expands minecarts and rails to provide intuitive, viable trasportation, automation and utility solutions.

Mod 9,426,748
Create: Design n' Decor

Create: Design n' Decor

A Create addon focused on QOL decoration features that expand on the base decoration ability of Create whilst focusing o...

Mod 11,170,465
ATi Structures

ATi Structures

A Pack adding a variety of structures found in the overworld

Mod 6,593,366
DnT Stronghold Overhaul

DnT Stronghold Overhaul

This is the Standalone split off version from Dungeons and Taverns Stronghold Rework. It adds 417 Rooms, Unique Strongho...

Mod 4,021,193
Adaptive Performance Tweaks: Spawn

Adaptive Performance Tweaks: Spawn

Optimization for monster spawn events and spawner.

Mod 3,340,145
Large Meals (An Add-on for Farmer's Delight)

Large Meals (An Add-on for Farmer's Delight)

A Farmer's Delight addon that adds new and creative recipes to the game.

Mod 7,213,960
Deep Dark: Regrowth

Deep Dark: Regrowth

A big horror expansion for the Deep Dark with new biomes and mobs.

Mod 4,599,065
Adaptive Performance Tweaks: Player Login Optimization and Protection

Adaptive Performance Tweaks: Player Login Optimization and Protection

Protects players during login and provides a special "easy" mode for less experience and child players.

Mod 3,694,377
Adaptive Performance Tweaks: Gamerules

Adaptive Performance Tweaks: Gamerules

Automatically adjust the random tick speed, entity cramming, raids, patrol, trader and insomnia based on the current ser...

Mod 3,741,338
Adaptive Performance Tweaks (Bundle)

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The Adaptive Performance Tweaks mod automatically adjust specific settings on the server to allow a better TPS/FPS.

Mod 4,410,814
ReForgedPlay [replay mod on (neo)forge]

ReForgedPlay [replay mod on (neo)forge]

Replay mod port to (neo)forge! Record your adventures in minecraft

Mod 2,018,238
Stackable Stew and Soup

Stackable Stew and Soup

Now you can stack the default stews and soups up to a maximum of 8 (configurable)

Mod 5,198,379
WI Zoom

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The zoom from the Wurst Client as a standalone mod.

Mod 16,598,943
Create: Enchantable Machinery

Create: Enchantable Machinery

This mod allows you to apply some vanilla enchantment to Create blocks.

Mod 4,763,078
Default World Type [Forge]

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Change the default world type for creating a new world

Mod 10,578,434
Mineral Delight

Mineral Delight

Crush, Cook and Eat Ores, Gems, and Crystals!

Mod 969,990
Create: Dynamic Village

Create: Dynamic Village

An expansion to Create that adds a fully-featured host of Create-mod village professions.

Mod 6,675,831
DespawnTweaker

DespawnTweaker

better Let Me Despawn optimization | Don't allow mobs from spawners to despawn

Mod 15,728,496
NoFog

NoFog

A highly configurable client-side Fabric, Forge(<=1.20.1) and NeoForge(1.20.2+) mod that removes all fog

Mod 7,886,482
Illager Additions

Illager Additions

This is a mod about illager content

Mod 1,924,834
Create: Protection Pixel

Create: Protection Pixel

A fancy armor mod with steampunk/create style

Mod 2,193,150
Alex's Mobs Interaction

Alex's Mobs Interaction

An addon that adds tons of new features specifically for the mod Alex's Mobs

Mod 1,157,718
Only Hammers And Excavators

Only Hammers And Excavators

A simple mod that adds various type of hammers & excavators, that mine 3x1 area

Mod 1,624,127
Piercing Paxels ⚒️

Piercing Paxels ⚒️

Dynamic Upgradable Multi-tools!

Mod 1,585,637
Better Brightness Slider

Better Brightness Slider

Drag the brightness-/gamma-slider to higher and lower values than default

Mod 2,674,916
Adaptive Performance Tweaks: Mods

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Automatic and realtime server bundling (one mod pack for client/server) and mod clean up for better performance and less...

Mod 2,585,615
project-869951

project-869951

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Mod 558,534
Ecospherical Expansion

Ecospherical Expansion

Overhauled generation to the biomes of the Overworld.

Mod 903,021
Phantom Loader

Phantom Loader

Phantom Loader is a library that automates part of the process of creating Minecraft mods for multiple mod loaders by ge...

Mod 1,368,461
Buried Wrecks

Buried Wrecks

A mod that adds buried shipwrecks to the underground

Mod 206,357
HRB's Drills

HRB's Drills

A vehicle to make mining a better experience.

Mod 112,903
Cave Spelunking[Forge/Fabric]

Cave Spelunking[Forge/Fabric]

Prevents ores from spawning not exposed to air/fluids/other ore blocks

Mod 1,450,725
Miner Villager

Miner Villager

A new entity for the Mineshafts!

Mod 567,274
Modifiers

Modifiers

Mod that adds Terraria-style modifiers to equipment.

Mod 2,236,347
Spider Caves

Spider Caves

Adds a spider cave biome and a spider armor

Mod 924,336
Azarbeat's Edible Monsters (Eat Zombies, Spiders, and much more!)

Azarbeat's Edible Monsters (Eat Zombies, Spiders, and much more!)

You can eat mobs now!! Enjoy the meal and have a nice day!!

Mod 66,528
project-1091132

project-1091132

This mod expand caves by adding a ton of stuff to make caves better like new biomes and mobs, it also adds new decorati...

Mod 59,808
project-1084974

project-1084974

A tiny performance mod, decreasing the rate some Create components tick at

Mod 102,451
Glowroot Caves

Glowroot Caves

A cave-biome mod based on the glow squid with new mobs, structures, and mechanics.

Mod 91,546
project-1078171

project-1078171

Adds to cave biomes dishes and food. Vanilla style.

Mod 50,136
What is 'Stone'? (Colorful Caves)

What is 'Stone'? (Colorful Caves)

Let's add a bit of spice to the existing caves, vanilla style!

Mod 40,356
Glowroots Two Electric Boogaloo

Glowroots Two Electric Boogaloo

Adds a new biome the glowroot Cavern

Mod 6,360
Cave Maps (Better Nether Map Port)

Cave Maps (Better Nether Map Port)

Configurable Maps for Caves and Cave Dimensions

Mod 39,097
WHAT THE GECKO

WHAT THE GECKO

Yes that's what you heard, here you can found geckos,reptiles, lizards,Tuataras and amphibians

Mod 156,836
[BMS-SGA] "New" Sculk Expension Cave+

[BMS-SGA] "New" Sculk Expension Cave+

Rediscover the Deep Dark of Minecraft !

Mod 16,645

External Resources