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

5,081

CurseForge ID

1186101

Last Updated

Jul 26, 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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Curios API (Forge/NeoForge)

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Embeddium

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Framework

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TerraBlender (Forge)

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Mod 114,860,691
Configured

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YUNG's Better Nether Fortresses (Forge/NeoForge)

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Mod 101,282,448
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Mod 75,680,915
YUNG's Better End Island (Forge/NeoForge)

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Mod 84,433,815
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Mod 60,972,628
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YUNG's Better Witch Huts (Forge/NeoForge)

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YUNG's Better Jungle Temples (Forge/NeoForge)

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Mod 84,426,856
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Mod 46,378,262
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Mod 76,216,227
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Cobweb

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Mod 34,993,674
Chloride (Embeddium++/Sodium++)

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Mod 50,792,947
CullLessLeaves Reforged (Unofficial)

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Mod 38,128,747
YUNG's Extras (Forge/NeoForge)

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Mod 76,090,454
Alex's Delight

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Mod 44,830,256
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Mod 25,521,452
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Rule the village! Trade with every villager at once!

Mod 63,798,313
MonoLib

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Mod 28,761,136
Alex's Caves

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Mod 40,711,655
Just Enough Archaeology

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Mod 29,199,587
Nether's Delight

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Mod 77,252,410
Yung Structures Addon for Loot Integrations

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Mod 22,173,223
Starlight (Forge)

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Rewrites the light engine to fix lighting performance and lighting errors

Mod 56,232,627
YUNG's Cave Biomes (Forge/NeoForge)

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Adds new vanilla+ cave biomes and underground content!

Mod 22,510,151
Friends&Foes (Forge/NeoForge)

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Illager Invasion

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Mod 37,123,110
Incendium

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Mod 42,673,142
Galosphere

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Mod 37,358,443
Bartering Station

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Mod 44,952,732
YUNG's Menu Tweaks (Forge/NeoForge)

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

Mod 24,174,614
DEUF - Duplicate Entity UUID Fix

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Mod 31,699,054
Bygone Nether

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Mod 50,522,697
Create Stuff 'N Additions

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Mod 34,487,713
Radiant Gear (Fabric/Forge/Quilt)

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Mod 21,286,909
Harvest with ease

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Mod 34,178,448
DnT Ancient City Overhaul

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Mod 13,644,118
Stay True

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Texture Pack 45,005,261
Complementary Shaders - Reimagined

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Shader 221,393,929
Underground Villages

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Mod 14,945,506
More Mob Variants

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Mod 28,664,943
Dynamic Lights

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Mod 34,020,013
Noisium (archived)

Noisium (archived)

Optimises worldgen performance for a better gameplay experience.

Mod 66,802,551
Enemy Expansion

Enemy Expansion

Adding variety to combat encounters in Minecraft!

Mod 7,853,306
Adaptive Performance Tweaks: Core

Adaptive Performance Tweaks: Core

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Mod 12,442,926
Adaptive Performance Tweaks: Items

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

Mod 10,166,454
Curious Lanterns

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

Mod 12,468,240
Relics: Alex's Mobs Compat

Relics: Alex's Mobs Compat

Compatibility addon between Relics and Alex's Mobs

Mod 9,383,088
Miner's Delight +

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Farmer's Delight add-on for miners

Mod 16,401,569
Villagers Sell Animals [NoCube's Mods]

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Mod 7,824,759
Relics: Alex's Caves Compat

Relics: Alex's Caves Compat

Compatibility addon between Relics and Alex's Caves

Mod 7,029,763
Alex's Caves Delight

Alex's Caves Delight

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

Mod 3,446,980
Alex's Caves: Stuff & Torpedoes

Alex's Caves: Stuff & Torpedoes

💥Adds torpedoes and equipment related to Alex's Caves

Mod 3,776,489
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 12,514,205
More Minecarts and Rails

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

Mod 9,669,521
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 12,668,428
ATi Structures

ATi Structures

A Pack adding a variety of structures found in the overworld

Mod 7,131,918
DnT Stronghold Overhaul

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Mod 4,237,556
Adaptive Performance Tweaks: Spawn

Adaptive Performance Tweaks: Spawn

Optimization for monster spawn events and spawner.

Mod 3,463,648
Large Meals (An Add-on for Farmer's Delight)

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

Mod 7,566,874
Deep Dark: Regrowth

Deep Dark: Regrowth

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

Mod 4,662,494
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 3,873,325
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Automatically adjust the random tick speed, entity cramming, raids, patrol, trader and insomnia based on the current ser...

Mod 3,908,968
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 4,550,472
ReForgedPlay [replay mod on (neo)forge]

ReForgedPlay [replay mod on (neo)forge]

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

Mod 2,288,227
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 5,794,797
WI Zoom

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The zoom from the Wurst Client as a standalone mod.

Mod 17,965,433
Create: Enchantable Machinery

Create: Enchantable Machinery

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

Mod 5,245,901
Default World Type [Forge]

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Change the default world type for creating a new world

Mod 10,956,704
Mineral Delight

Mineral Delight

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

Mod 1,017,462
Create: Dynamic Village

Create: Dynamic Village

Expansion that adds a fully-featured host of Create-mod village professions.

Mod 7,127,127
DespawnTweaker

DespawnTweaker

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

Mod 16,096,661
NoFog

NoFog

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

Mod 8,008,653
Illager Additions

Illager Additions

This is a mod about illager content

Mod 2,047,192
Create: Protection Pixel

Create: Protection Pixel

A fancy armor mod with steampunk/create style

Mod 2,284,206
Alex's Mobs Interaction

Alex's Mobs Interaction

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

Mod 1,288,818
Only Hammers And Excavators

Only Hammers And Excavators

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

Mod 1,743,385
Piercing Paxels ⚒️

Piercing Paxels ⚒️

Dynamic Upgradable Multi-tools!

Mod 1,596,715
Better Brightness Slider

Better Brightness Slider

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

Mod 2,784,923
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 2,645,218
project-869951

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Mod 560,879
Ecospherical Expansion

Ecospherical Expansion

Overhauled generation to the biomes of the Overworld.

Mod 921,697
Phantom Loader

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

Mod 1,478,820
Buried Wrecks

Buried Wrecks

A mod that adds buried shipwrecks to the underground

Mod 218,625
HRB's Drills

HRB's Drills

A vehicle to make mining a better experience.

Mod 120,304
Cave Spelunking[Forge/Fabric]

Cave Spelunking[Forge/Fabric]

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

Mod 1,495,838
Miner Villager

Miner Villager

A new entity for the Mineshafts!

Mod 659,812
Modifiers

Modifiers

Mod that adds Terraria-style modifiers to equipment.

Mod 2,275,385
Spider Caves

Spider Caves

Adds a spider cave biome and a spider armor

Mod 1,003,113
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 68,644
project-1091132

project-1091132

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Mod 62,663
project-1084974

project-1084974

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

Mod 104,217
Glowroot Caves

Glowroot Caves

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

Mod 121,873
project-1078171

project-1078171

Adds to cave biomes dishes and food. Vanilla style.

Mod 50,964
What is 'Stone'? (Colorful Caves)

What is 'Stone'? (Colorful Caves)

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

Mod 41,586
Glowroots Two Electric Boogaloo

Glowroots Two Electric Boogaloo

Adds a new biome the glowroot Cavern

Mod 6,632
Cave Maps (Better Nether Map Port)

Cave Maps (Better Nether Map Port)

Configurable Maps for Caves and Cave Dimensions

Mod 41,417
WHAT THE GECKO

WHAT THE GECKO

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

Mod 173,140
[BMS-SGA] "New" Sculk Expension Cave+

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

Rediscover the Deep Dark of Minecraft !

Mod 16,978

External Resources