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🍄 Luminous Caverns

Found only under Mushroom Fields
This is a peaceful cave with no natural hostile mobs spawning
Luminous Mooshrooms and Shroom Elfs roam the land

Vegetation & Foliage

Giant Luminous Mushrooms & Giant Gloomy Mushrooms generate in this cave
Normal-sized mushrooms generate on the surface
Radiant Vines grow from the ground
These plants all emit a small amount of light!

Food

Luminous Mushroom Stew

Crafted with 1 Bowl, 1 Luminous Mushroom, and 1 Gloomy Mushroom
- Replenishes 6 hunger points (3 hunger bars)
- Gives you Night Vision for 15 seconds

Mysterious Stew

Crafted with 1 Bowl, 1 Luminous Mushroom, 1 Gloomy Mushroom, 1 Red Mushroom, 1 Brown Mushroom, and 1 Mysterious Mushroom
- Replenishes 3 hunger points (1.5 bars)
- Gives you 1-2 random effects (selecting from all positive and negative effects)

Ores

Luminite

A blue gemstone that can be found in Luminous Caverns
Luminite Ore generates at Y levels -64 to 12
- Drops 1-2 Luminite Shards when broken

Combine 6 Luminite Shards and 1 Diamond in a Crafting Table to get 1 Luminite
Luminite can be used to craft gear!

As Luminite gear is harder to obtain than Diamond gear but also easier to obtain than Netherite, the stats of Luminite gear are in between Diamond and Netherite gear.

Mobs

Shroom Elf

Spawns in Luminous Caverns
Bred using Luminous Mushrooms
Has 8 health (4 hearts) and dies almost instantly from lava
Runs away from the player but can be lured using Luminous Mushrooms
Drops 0-2 Luminous Mushrooms when killed

Luminous Mooshroom

Spawns in Luminous Caverns
Bred using Wheat
Interact with one using:
- A bucket to get milk
- A bowl to get Luminous Mushroom Stew
- A Mysterious Mushroom first, then a Bowl to get Mysterious Stew
- Shears to get Luminous Mushrooms. This will turn them into normal cows.

🧙‍♀️ Slimy Sewers

Found under Swamps and Mangrove Swamps
This is a very dangerous cave with thick green fog, limiting your render distance
The natural habitat of Slimes, Witches and Slimy Zombies

Vegetation & Foliage

A layer of Slimy Stone replaces Stone on the surface, which slows you down
Slime Layers cover most of the floor
Slimy Blossoms and Slimy Sprouts scatter across the cave
Sticky Spikes generate on the surface and hurts you when you step on them
Slime drips from the ceiling
Mud, Tall Grass and Slimy Pebbles can be found here

Food

Slime Soup

Crafted with 1 Bowl and 2 Slimeballs
Replenishes 3 hunger points (1.5 bars)
Gives you Jump Boost II for 8 seconds and Resistance II for 5 seconds
Has a 45% chance to also give you Hunger I for 30 seconds and Nausea II for 20 seconds

Mobs

Slimy Zombie

Spawns in the Slimy Sewers in large hordes of 3 to 5
Has 20 health (10 hearts) like a regular zombie
Throws Hardened Slimeballs at enemies, dealing 7 damage (3.5 hearts) with no armor
Drops: Hardened Slimeballs and Rotten Flesh
Vanilla Minecraft Slimes spawn more frequently here, in groups of 2 to 4
Vanilla Minecraft Witches also spawn more frequently here, in groups of 1 to 2

Structures

Slime Dungeon

Generates under Swamps between Y=-59 and 47.
There are 2 variants: Stone & Deepslate, for their respective Y levels
There are 3 spawners: 1 with Slimes, and 2 with Slimy Zombies

Special Weapon

There is a treasure chest in the middle with valuable loot, including the Slime Dagger (exclusively found here!)
Slime Daggers deal +4 attack damage and inflict enemies with 6 seconds of Poison II & 3 seconds of Jump Boost I

Other Blocks

Here is everything new you can get from the Slimy Sewers.
Slime Dungeons are built using Slimy Stone Bricks, Slimy Deepslate Bricks, and Slimy Deepslate Tiles. You can craft them using Slimy Stone and Slimy Deepslate!
Slime Lanterns can be crafted using 1 Glowstone and 4 Hardened Slimeballs!

🦂 Limestone Caves

Found only under Deserts
This is a very dusty cave with thick yellow fog
Home to dangerous creatures like Scorpions and Sandy Skellies

Vegetation & Foliage

All stone in this cave is replaced with Limestone, Cobbled Limestone, Calcite, and Sandstone
Patches of Quicksand and Coarse Dirt occasionally generate
Limestone Pebbles, Cobbled Limestone Pebbles, and Sand Layers can be found on the floor
Sandy Roots hang from the ceiling

Mobs

Scorpion

Spawns in the Limestone Caves in swarms of 2 to 4. Also spawns on the Desert surface in swarms of 1 to 3
Has 16 health (8 hearts)
Inflicts 10 seconds of Poison every attack
Drops Raw Scorpion on death (or Cooked Scorpion if died in fire or lava)
Vanilla Minecraft Husks also spawn more frequently here, in hordes of 2 to 4

Sandy Skelly

Spawns in the Limestone Caves in groups of 1 to 2
Has 16 health (8 hearts)
Has a 10% chance to drop their skull when killed

Special Weapon

Wand of the Sands

Crafted using Sandstone Sticks (found in Limestone Dungeons) and 1 Sandy Skelly Skull.
Used to trigger sandstorms, inflicting 5 seconds of Blindness and Weakness II to opponents!

Food

Raw and Cooked Scorpion

Raw Scorpion items drop from Scorpions on death
- Replenishes 1 hunger point (0.5 bars)
- Gives you Fatal Poison II for 10 seconds, Nausea III for 8 seconds, and Hunger III for 10 seconds
Raw Scorpion items can be smelted in a Furnace or Smoker to make Cooked Scorpion
- Replenishes 5 hunger points (2.5 bars)

Potion of Fatal Poison

Brewed using Raw Scorpion items.

Structures

Limestone Dungeon

Limestone Dungeons generate under Deserts between Y=6 and 40.
- There are 4 spawners, 2 with Scorpions and 2 with Husks
- There is a treasure chest in the middle with valuable loot, including diamonds, golden apples, and/or enchanted apples
Generates under Deserts between Y=6 and 40.
- There are 4 spawners: 2 with Scorpions, 2 with Husks
- There is a treasure chest in the middle with valuable loot, including diamonds, golden apples, and/or enchanted apples

Limestone Ruins

Found in Limestone Caves between Y=6 and 47.
- All ruins have a chest, which contains useful items.
- There are 6 variants in total. See if you can find them all!

Limestone Arena

Generates between Y=6 and 50.
- Interact with the gray Arena Trigger to start the battle!
- Defeat all mobs within the time limit to receive rewards.
- Arena Battles cannot start in Peaceful. Check your difficulty!

Other Blocks

Limestone Dungeons, Limestone Ruins and Arenas are built using Limestone Bricks. You can craft them using Limestone, and there are many other variants as well!

All Ores generated in Limestone are replaced with their Limestone variant. These new ores have the same stats as Vanilla ores.

❄️ Ice Caves

Found under all cold and frozen biomes, such as Snowy Taigas, Ice Plains and Frozen Oceans
Ice can be found everywhere, such as dripping icicles and ice crystals
Penguins, Frost Spirits and Ice Bombers call these desolate caves home

Vegetation & Foliage

Ice Crystals, Frosted Stone and Frosted Deepslate replaces most stone on the cave surface
Crystallized Ice and Blue Ice make up the cave ceiling
Pebbles can be found on the floor
Icicles drip from the ceiling

Mobs

Penguin

Spawns in the Ice Caves in groups of 2 to 4, and on the surface of in groups of 3 to 5
Has 10 health (5 hearts)
Cannot be tamed but can be lured and bred using Raw Cod and Raw Salmon
Vanilla Minecraft Strays also spawn more frequently here, in armies of 2 to 3

Frost Spirit

Spawn in the Ice Caves in groups of 1 to 2
They are playful little ice cubes that jump and attack you, dealing 3 damage (1.5 hearts) per hit
Has 16 health (8 hearts)
Drops Frost Essence, which can be used for brewing and crafting a special weapon

Ice Bomber

Spawns in Ice Caves in groups of 1 to 2
Throws Ice Bombs, dealing 1 damage on hit and 1.5 seconds of Freezing
Has 20 health (10 hearts)
Drops 0-2 Ice Bombs

Potions

Potion of Freezing

Frost Essence can be used to brew Freezing potions, which give you Slowness and Mining Fatigue.

Structures

Ice Fort

Generates at y=-20.
Beyond The Underground’s first procedurally generated structure! This means every Ice Fort will have a unique layout and different from any other you’ve conquered.
Contains the legacy Ice Dungeon structure (rare) and an ice-themed Arena Battle, with biome-exclusive rewards
Many loot chests can be found here!

Special Weapon

Bane of Frost

Crafted using 6 Frost Essence, 1 Frozen Core, and 2 Sticks.
This weapon deals +6 attack damage and inflicts 3 seconds of Slowness IV and Mining Fatigue III.

Other Blocks

Packed Ice Bricks can be crafted using Packed Ice. There is also Chiseled Packed Ice with a snowflake pattern.

💐 The Undergrowth

Found under Jungles, Bamboo Forests, Roofed Forests, Meadows and Flower Forests
Home to the Rainbow Gum Tree, giant flowers and mushrooms
Watch out for the Thornspitter and their tracking thorns!

Vegetation and Foliage

Chromatic Petals and Twilight Spores generate everywhere
Star Jasmine generate on Rainbow Gum trees
Giant flowers are very common

Mobs

Thornspitter

Spawns in groups of 2 to 3 and in Giant Wither Roses
Shoots tracking thorns at you
Has 16 health (8 hearts)
Drops melons with a 4% chance of dropping the Corrupted Bouquet

Structures

Giant Wither Rose

Giant Flowers have a 4% chance to be Giant Wither Roses. These flowers have a Thornspitter spawner in them.
The chest has an 70% chance of generating with a Corrupted Bouquet

Other Blocks

The Rainbow Gum tree comes with its own wood type!

🔮 Crystal Caves

Found under Plains, Forests, Birch Forests and Taigas
Giant Gypsum formations and Topaz Crystals can be found here, alongside Gypsum Needles that grow from the cave ceiling.
Home to the Crystal Firefly.

Mobs

Crystal Firefly

Spawns in groups of 2 to 4
Has 6 health (3 hearts)
Flies around leaving behind trails of topaz dust particles

Special Item

Combustion Amulet

Use to gain the Touch of Fire ability: For a specified duration, instantly smelt blocks you break and set entities you hit on fire.
Recharge the amulet with 1 XP level for 30 seconds in an Experience Tank. The maximum duration is 3 minutes.
You can only charge an amulet 3 times. After that, you’ll have to craft a new one!

Other Items

Calcined Gypsum

Put this and 8 Concrete Powder in a crafting table to get Concrete. No need to use water!
Obtained by smelting Gypsum Shards.

Gypsum Fertilizer

Grows a crop or tree instantly. Put 4 Azure Bluets, Cornflowers, Dandelions, or Oxeye Daisies in a 2x2 grid to grow a Giant Flower.
Crafted with Gypsum Shards.

🍂 Arid Caves

Found under Savannas and Badlands.
Lifeless terrain scattered with Petrified snags, bushes and dry grass.

Vegetation & Foliage

The entire cave is dry, with the surface made of Packed Mud and Coarse Dirt
Only Petrified Bushes and Dry Grass are found here

Blocks

Petrified Wood

Petrified snags generate with its own new wood type! The set is light gray and slightly darker than Pale Oak.
The best tool to break Petrified wood is a Pickaxe.

☠️ Soul Caverns (Nether Caves)

Found exclusively in new, giant caverns beneath the Nether Wastes!
These caves are home to the Crooked Forest, with the new Crooked wood type
Souls are present almost everywhere in this cave. Watch out for ghostly, wandering Wisps!

Vegetation & Foliage

Crooked Fungi and Crooked Roots generate here
Giant Crooked Fungi are found everywhere
Lava pits and Soul Geysers are common in this cave. Tread carefully!

Mobs

Wisps spawn in the Soul Caverns and in Soul Sand Valleys
They spawn in groups of 2 to 3
They have 12 health (6 hearts)
They shoot Souls at you, which deal a lot of damage!
They drop Soul Fragments upon death, which can be used to craft the Soul Healer

Soul Fragments can also be used to brew Potions of Decay, which give you the Wither effect.

Food

Crooked Fungus Stew can be crafted with 1 Bowl and 2 Crooked Fungi
- Replenishes 6 hunger points (3 bars)
- Gives you Fire Resistance for 20 seconds

Structures

Soul Castles generate in the Soul Caverns. Continue exploring, and you'll find one eventually!
- There is 1 Wisp spawner
- There is a treasure chest filled with goodies, ranging from Soul Bricks to Diamonds, Enchanted Apples, Soul Fragments, or even the Soul Healer!
- Hidden underneath the lava are Broken Lava Tanks. Repair them in a Crafting Table first!

Other Blocks

Lava Tanks work like sponges, but for lava instead. Add either Gold Ingots or Diamonds to a Broken Lava Tank in a Crafting Table to repair them.
The only source of Lava Tanks are the Soul Castles.
Gold Lava Tanks remove lava from a 7x6x7 area, while Diamond Lava Tanks remove lava from a 11x6x11 area.
Lava Tanks need to be cooled down after each use. Follow the in-game instructions for more details!

The Soul Caverns include a new wood type: the Crooked wood!

Soul Stone generate in the Soul Caverns and in Soul Sand Valleys. Craft them into Soul Bricks for building!

⚡ Other Content

Experience Tank

Crafted using 3 Topaz, a Diamond and 5 Glass
Deposit XP and get XP back every Minecraft day. The more you deposit, the more you get!

Lost Explorer Camp

Generates across the Overworld between Y=-30 and 20, except in Crystal Caves and the Deep Dark.
Notice a flashing Suitcase in the camp. Interact with it to summon the Lost Explorer!
They take Topaz as currency and trade unique items from various cave types.
They won’t sell specialties from the Crooked Caverns. The Nether is too dangerous of a travel destination!

Blocks

Pebbles

Normal variants generate across the Overworld.
Limestone variants generate in Deserts.
Slimy variants generate in Slimy Sewers.
Ice variants generate in Ice Caves.
To craft more pebbles, simply put the respective block into a Stonecutter!

Glow Lichen Block

Generates in large patches across the Overworld.
Has no purpose except to look cool!

Background music is played when exploring the cave biomes! These songs were all made by Leonardo.

Check out the YouTube playlist for all the songs!

https://www.youtube.com/playlist?list=PLVrBxU8IKs7KvkCUh3CXYQQGdRqQDnqV1

Credits

A massive thank you to everyone who contributed to the pack!

Terms of Use

You are allowed to:

Edit the pack for personal use.
Use the pack in your private modpack that you aren’t releasing publicly. You cannot use the pack in a public modpack.
Make videos & media content with the pack.

You are NOT allowed to:

Distribute the pack using a new download link. Always share the link to to this page.
Monetize the pack download. Doing so will result in a copyright takedown.

Known Issues

This add-on may decrease performance on lower-end and weaker devices.
When you enter your world in a biome with a new cave type, it may take a while for all chunks to load. World generation may also take longer in general, especially on weaker devices.

Beyond The Underground (8 New Cave Biomes!)