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 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 in large groups of 4 to 8

• 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 it using:

  • A bucket to get milk

  • A bowl to get Luminous Mushroom Stew

  • Mysterious Mushroom first, then a Bowl to get Mysterious Stew

  • Shears to get Luminous Mushrooms. This will turn them into normal cows

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, 2 with Slimy Zombies

• There is a treasure chest in the middle with valuable loot, including the Slime Dagger (exclusively found here!)

• Slime Daggers deal 6 seconds of Poison II to any mob attacked using this weapon

• 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!

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 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

• 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!

Other Blocks

• Limestone Dungeons & Limestone Ruins 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.

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 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 damage and inflicts 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!

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!

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.

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.

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 7x4x7 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 the new Crooked wood type.

• Soul Stone generates in Soul Caverns and Soul Sand Valleys. Craft them into Soul Bricks for building!

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.

• 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!

New Cave Type: Arid Caves!

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

New Cave 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.

Made cave type generation more common:

• The Slimy Sewers (Slime Caves) now generate under Mangrove Swamps.
• Ice Caves now generate under all cold biomes, such as Snowy Taigas.
• The Undergrowth (Forest Caves) now generates under Flower Forests and Meadows.
• Pebbles now generate more frequently in all Overworld biomes.
• Limestone now generates in all Overworld biomes, except for Roofed Forests, Jungles, and cold & frozen biomes.
• These changes mean it’s now easier than ever to find the new caves and blocks in your world!

New Structure: Ice Fort!

• Found deep in the Ice Caves at Deepslate level. Look out for Frostslate Bricks while mining!
• Uses the Jigsaw system to procedurally generate rooms and corridors. This means every Fort you find will be unique and different from any other you’ve explored!
• Obtain special loot and crafting ingredients for the Bane of Frost.
• The legacy Ice Dungeon structure has been turned into a room in the Fort. It has a lower chance of generating than other rooms, and on average 1 will generate for each Fort. 2 mob spawners were removed for difficulty balancing, but chest contents remain the same.

Arena System Rework:

• You might not notice many changes, but most of the arena code has been refactored / rewritten to improve maintainability and scalability.
• Arenas now generate in a special room in Ice Forts, with ice-themed rewards and mob spawning.
• When interacting with an Arena Trigger in Peaceful difficulty, an error message now shows and no battle is triggered.
• The battle countdown is now visible to all players within a 32 block radius of the Arena Pillar.
• You can now start another Arena Battle immediately after one ends.
• A sound effect plays on losing.

Lost Explorer Rework:

• Their camps are now found in all parts of the Overworld between y=-50 and 20, except in Crystal Caves and the Deep Dark. (It doesn’t make sense for them to only get lost in Ice Caves!)
• They now 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!
• You no longer need an Emerald to summon the Lost Explorer.
• Unused suitcases now flash to indicate they can be interacted with.
• Removed the Ice Crystal from the Lost Explorer’s camp.

New Blocks:

• Experience Tank.
  • Deposit XP and get XP back every Minecraft day. The more you deposit, the more you get!
• Petrified Wood (Log, Wood, Planks, Slab, Stairs, Fence, Fence Gate, Door, Trapdoor). Best tool to break is a Pickaxe instead of an Axe.
• Petrified Bush
• Block of Gypsum
• Gypsum Cluster
• Gypsum Needles
• Block of Topaz
• Topaz Cluster
• Frostslate Bricks (Normal, Slab, Stairs)
• Ice Fort Lamp
• Limestone Ores (Coal, Copper, Diamond, Emerald, Gold, Iron, Lapis Lazuli, Redstone)
• Stairs (Crooked, Frosted Stone, Rainbow Gum, Slimy Deepslate Tiles, Slimy Deepslate Bricks, Slimy Stone Bricks, Limestone, Limestone Bricks, Soul Bricks, Packed Ice Bricks)

New Items:

• Gypsum Fertilizer.
  • Grows a crop or tree instantly. Put 4 Azure Bluets, Cornflowers, Dandelions, or Oxeye Daisies in a 2x2 grid to spawn a Giant Flower.
• Gypsum Shard.
  • Use to craft Gypsum Fertilizer & Combustion Amulet. Smelt to get Calcined Gypsum.
• Calcined Gypsum.
  • Put this and 8 Concrete Powder in a crafting table to get Concrete.
• Topaz.
  • Currency for trading with Lost Explorers. Use to craft Combustion Amulet and Experience Tank.
• Ice Bomb.
  • Throw at enemies to freeze them in place for 1.5 seconds.

New 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 XP Tank, for a maximum of 3 minutes.

New Mobs:

• Ice Bomber.
  • Found in the Ice Caves and Ice Forts. Throws Ice Bombs.
• Crystal Firefly.
  • Flies around leaving behind trails of topaz dust particles.

Other Changes:

• Blocks that react to redstone, such as Fence Gates and Doors, no longer rely on Minecraft:tick to detect power. This should significantly reduce tick lag, especially if you’ve placed many of these blocks.
• All blocks in this add-on now break faster when using the correct tools and tier.
• Adjusted the breaking speed by fist of some blocks to match similar blocks in vanilla.
• Some blocks now require breaking with the correct tool and tier to drop.
• Limestone variants of ores now replace the stone variants whenever ores generate in Limestone.
• Rooted Dirt patches and Hanging Roots now generate in most Overworld biomes.
• The song Excuse by C418 now plays in the Undergrowth.
• Slimy Zombies now spawn in smaller hordes.
• Thornspitters now naturally spawn in the Undergrowth.
• Luminite Ore and Deepslate Luminite Ore are now affected by Fortune.
• Sand Layers and Slime Layers are now replaceable. This means a new block (e.g. a torch) can replace them at their current position.
• Sticky Spikes and Dripping Icicles now require Silk Touch to obtain.
• You can now craft Limestone into Cobbled Limestone using a Stonecutter.
• Crooked Fungi can now be placed on Cave Turf and Deepslate Cave Turf.
• Pebbles now break when coming in contact with flowing water.
• Added explanations for some items in their item names.
• Crooked and Rainbow Gum Planks (and their products) are now in their own item groups in the creative menu.
• Used Suitcases are now available in the creative menu.
• The Slime Dagger’s special ability has been renamed as “Slimy Curse”.
• Frosted Deepslate has been renamed as Frostslate.
• Ice Dungeons no longer generate on their own.
• Instead of anvil sounds, interacting with Lava Tanks that are locked or on cooldown now plays the “block.false_permissions” sound.
• Entities can no longer jump over Beyond The Underground fences.
• Crooked Planks and Rainbow Gum Planks can now be used to craft Wooden Spears.
• Twilight Spores now generate particles less frequently to reduce lag.
• New background panorama featuring the Crystal Caves.
• Added some debug commands. These aren’t meant for general use. Use them at your own risk.
• This add-on now requires Minecraft 26.20 or above to function.

Fixed Bugs:

• All Beyond The Underground hostile mobs now only spawn at a light level of 0.
• Lava Tanks now work again.
• Water no longer flows through non-full blocks.
• Texture flickering no longer occurs on blocks with cross-shape geometries.
• Fixed “Invalid asset path” errors that appeared in the content log.
• Fixed the high spawn weights of mobs that prevented other mobs from spawning.
• Crooked Stems can now be stripped.
• Crooked wood now play nether wood sounds.
• Limestone Slabs, Rainbow Gum Slabs and Slimy Deepslate Brick Slabs now play the correct sounds.
• Luminous Mushroom Stew, Mysterious Stew, Slime Soup and Crooked Fungus Stew are now available in the creative menu.
• You can now craft campfires using Crooked and Rainbow Gum Logs / Wood.
• Fixed incorrect map color for Rainbow Gum Planks.
• The Bane of Frost now breaks Chiseled Packed Ice faster.
• Fixed incorrect information in some loading screen tips.
• “Can’t find animation…” errors no longer appear when encountering a Slimy Zombie.
• Content log errors no longer appear when breaking blocks at y=1 or y=319.
• Content log errors no longer appear saying Beyond The Underground spawn eggs were put into the wrong category.
• Fixed “minecraft:render_offsets has been deprecated…” content error upon world load.
• Undead mobs are now immune to Soul Magma Blocks.