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Cavernous

Cavernous

by thxlotl • Downloads: 0 • Followers: 0
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IMPORTANT NOTICE!!!

Cavernous is being discontinued in favor of Cavernous LITE. This means past 1.21.10 this version of Cavernous will not be officially supported. Please find Cavernous LITE here.


Cavernous is a vanilla-like datapack that adds 14+ new cave biomes, New structures, features and advancements and much more. From variants of the default caves, to biomes unlike any you've seen before, you'll never run out of things to explore in Cavernous' new underground.


BIOMES:

Volcanic Caves - Lava filled caves that house some great rewards but far greater risk. Also contains a new custom block called the geyser block, which launches you high in the air.

Splattered Caves - Standard caves with much more frequent placement of andesite, diorite, and granite.

Marshy Caves - Found under swamp biomes, these caves provide muddy terrain and giant sprawling roots hanging from the ceiling from the trees in the biomes above

Marble Caves - Like the standard caves except with walls of diorite and calcite.

Lush Dripstone Cave - A mix of the two vanilla cave biomes

Tropical Caves - Under the jungle biome a new cave generates that houses ancient temples and lush forests. Be weary as it houses some poisonous secrets.

Icy Caves - Found under mountains and cold biomes, these caves prove treacherous, from the slippery floors to the ever-present danger of powder snow. Extra ores and cave systems can be revealed by looking through layers of ice. It also spawns strays.

Fungal Caves - A packed lush environment that features giant mushrooms and other ancient plants. Explore these caves guided by the light of shroomlights and navigate through this dense undergound jungle.

Glowshroom Caves - Another mushroom filled biome with a little more bioluminescence.

Crystal Caves - Find huge sprawling geodes in these underground complexes that light up the walls with all sorts of amethyst crystals.

Arid & Desert Caves - Add a sandy underground that generate under dry biomes like badlands, deserts, and savannahs. Find huge dead bushes and cacti, and multiple new structures. Husks will spawn there and even drop sand.

Painted Caves - A rare variant of the desert caves that provide extra color to the underground

Caldera Caves - A scalding hot biome that generates with pools of water and the new custom geyser blocks.


STRUCTURES:

Dungeons - The vanilla dungeons have been replaced by a new complex that can come in many different variants.

Cave Villages - New village variant that spawns in any of the stone caves

Lush Cave Villages - Another variant of the cave villages that spawns in any heavily vegetated caves

Husk Spawner - New variant of the dungeons that spawns in any of the desert cave biomes

Overgrown Temple - An ancient temple found in the tropical caves, contains valuable loot and holds many secrets to be uncovered

Sandstone Temple - A dangerous trap-filled temple found in any of the desert cave biomes

Abandoned Thermal Plant - Found deep in the volcanic caves, solve puzzles and cool down the thermal reactor to gain access to new treasure


MISC FEATURES:

Geyser Block - Custom block that launches you high in the air when stepped on. Place any ice under it to stop it from activating by stepping on it or randomly. When powered with redstone it will burst, leading to many unique integrations.

New items - Will be added with the 1.0 release on July 14th.

New mob variants - Will be added with the 1.0 release on July 14th.

Creepers - Now do slightly less environmental damage but leave behind a lingering cloud of poison

Advancements - Adds custom advancements related to cavernous and caves in general


GEYSER DISCLAIMER

If you are using Cavernous on a server, you must have command blocks enabled. This is only so the geysers can generate and does not give anyone access to command blocks. You can do this by going to the server.properties file and setting "enable-command-block" to true.

You also cannot use other datapacks that unlock all recipes since it breaks certain features. An alternative datapack can be found here: https://wasdbuildteam.website/data-packs/unlock-all-recipes/


UPDATING FROM OLD CAVERNOUS VERSION

In order to update from a version released before Minecraft 1.20, you must delete the old Cavernous datapack in your world's datapack folder and then put in the new datapack (the one this read me belongs to) and drag the "CavernousCompatibility.zip" from the same folder into the datapack folder as well. You only have to do this once, every other time you upgrade to a new version the compatibility pack will still work.


All Versions

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Name Game version Platforms Published Downloads Actions
1.21.x
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1.21.x
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1.21.x
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1.21.x
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1.21.x
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1.21.x
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1.21 1.20.x
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1.20.x
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1.20.x
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1.20.2
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1.20.2
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1.20.2
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1.20.x
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[2.2.4] 2.2.4 by thxlotl on Oct 16, 2026
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Updated to 1.21.9 & 1.21.10
[2.2.4] 2.2.4 by thxlotl on Oct 16, 2026
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Fixed clouds missing in overworld.
[2.2.3] 2.2.3 by thxlotl on Oct 16, 2026
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Updated for version 1.21.8. There shouldn't however be problems with backwards compatibility to 1.21.6.

Ancient Secrets is now a seperate datapack that is added on top of the normal Cavernous download. If you want to play with the features of Ancient Secrets then just download that file and drop it into your datapack folder.

PLEASE NOTE: if you have an older world with 2.2.2 or before on it, you will have to download both packs here. If you do want to remove the Ancient Secrets features, I plan on releasing a patch pack that will let you uninstall it in the future.
[2.2.2] 2.2.2 by thxlotl on Oct 16, 2026
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Updates:
  • 1.21.5 Compatibility
  • Added new model for geyser blocks
  • For the return portal, if you don't have a set spawn anywhere, it will teleport you to 0,0 in the overworld. This is due to limitations of being able to get the world spawn with command blocks.

Fixes:
  • Fixed skeleton loot table
  • Fixed custom items
  • Fixed advancement requirements and backgrounds
  • Fixed final boss fight
  • Fixed return portal
  • Fixed custom explorer maps
  • Fixed all custom mobs & their logic

[2.2.1] 2.2.1 by thxlotl on Oct 16, 2026
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1.21.4 Compatibility
[2.2.1] Cavernous 2.2.1 by thxlotl on Oct 16, 2026
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1.21.2+ Version
[2.2.1] Cavernous 2.2.1 by thxlotl on Oct 16, 2026
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Bug Fixes

  • Fixed TPS issue in noxwoods

Changes

  • Changed geysers to now have a threshold where even if you haven't stood on them the whole second, they will activate anyway at the end of the second
  • Changed particle displays on geyser
# Changes
  • Tweaked biome placement. No longer overrides vanilla placement and is more sensible.
  • No torchflower in fungal caves
  • Made ghosts spawn in the vilegorge 25%, with skeletons now being able to spawn there as well
  • Removed giant cactus
  • Reduced vine density in tropical caves
  • Changed structure spacing
  • Reduced rarity of treasure ore veins and gold chunks
  • Less powder snow in icy caves

# Bug Fixes
  • Fixed Exit Portal for ancient secrets
  • Changed undergrowth root plaement
  • Fixed height correlated placement issues in the tropical caves
  • Fixed flicker occuring with miner helmet vision
  • Recipes no longer use old crafting system
  • Fixed issue with geyser redstone capability
  • Fixed geyser display issue
  • Fixed glob display issue
  • Fixed glob explosion
  • Fixed chain arrow playing sound globally
  • Various small things
  • Fixed issue with mob loot tables
  • Fixed oozer not exploding properly
  • 1.21 compatability (1.20.5 at own discretion)
  • Bogged spawn in tropical caves instead of mossclad skeletons
  • Various bug fixes
# Cavernous: Ancient Secrets P2 [v2.1.1]

Fixed version incompatibilities

## Bug Fixes

  • Priest can't enter portal during boss fight or after, also made portal shut off while in process of fight
  • Entities going through portal now properly teleport to overworld
# Cavernous: Ancient Secrets P2 [v2.1.0] [1.20.3-1.20.4]

## Additions

  • New Dimension: The Myst
  • 3 New biomes, the Dreadmire, Noxwoods, and Vilegorge.
  • New story related structures.
  • New mobs, Oozer and Ghost, spawning in the Noxwoods and Vilegorges respectively
  • Tons of new enviornments to explore.
  • New final boss fight.

## Bug Fixes

  • Changed way that mob conversions are handled, should hopefully help with some issues regarding mob spawning.
# Cavernous: Ancient Secrets P2 [v2.1.0] [1.20.2]

## Additions

  • New Dimension: The Myst
  • 3 New biomes, the Dreadmire, Noxwoods, and Vilegorge.
  • New story related structures.
  • New mobs, Oozer and Ghost, spawning in the Noxwoods and Vilegorges respectively
  • Tons of new enviornments to explore.
  • New final boss fight.

## Bug Fixes

  • Changed way that mob conversions are handled, should hopefully help with some issues regarding mob spawning.
# Cavernous: Ancient Secrets [v2.0.1] [1.20.2]

## Bug Fixes

  • [ ] Fixed lack of some ore placement in deep dark and lush and dripstone caves
  • [ ] Fixed issue where health was not drained properly when using ancient armor.
  • [ ] Fixed issue with "The Priest" hint not being achievable
# Cavernous: Ancient Secrets [v2.0.0] [1.20.2]
The Ancient Secrets expansion for Cavernous introduces many new features centering around the new Undergrowth biome, and it's dark and mysterious past.

## Changes

  • [ ] Creepers no longer have reduced explosion radii or lingering fields of poison. I'm opting to make this a seperate pack for those who might want to disable it.
  • [ ] Tweaked biome placement

## Additions

  • [ ] Ancient Secrets Story
  • Follow a storyline that discovers the long forgotten mystery of "The Veil" a mysterious cult that seemingly dissappeared out of thin air. Taking you throughout the Undergrowth, you'll discover more and more about the history behind this biome.
  • [ ] Added The Undergrowth
  • [ ] Ominous new biome found rarely underground
  • [ ] Giant growths of "Dreadroot" all throughout, reaching from the floor to the ceiling with blood red leaves
  • [ ] Ruins can be found throughout it
  • [ ] Structures:
  • [ ] The Citadel
  • Ancient structure found in the undergrowth. Former home to The Veil.
  • [ ] The Monolith
  • Another structure that provides clues to the true backstory of the undergrowth
  • [ ] Mobs:
  • [ ] Glob
  • Moving "glob" of some sort of meaty substance that spawns in the Undergrowth.
  • Explodes when near the player, causing knockback and the nausea effect.
  • Drops rotten flesh and bones. Gross.
  • [ ] Veil Guard
  • New variant of skeleton that spawns in the undergrowth
  • Melee attacks
  • Rare chance of dropping an ancient tablet (detailed in items section)
  • [ ] Items:
  • [ ] Ancient Tablet
  • Used to craft ancient gear, throw on ground with the desired gears respective crafting item.
  • [ ] Ancient Gear
  • [ ] Ancient Blade
  • Sword that does an incredible amount of damage but rapidly drains the user of their health.
  • Crafted with stone sword and ancient tablet.
  • [ ] Ancient Repeater
  • Crossbow that will automatically load any arrows into your inventory into it.
  • Rapid fire shooting
  • Drains health each shot
  • Crafted with crossbow and ancient tablet.
  • [ ] Ancient Shield
  • Build up blocked damage to stun enemies around you. Does damage to user at same time.
  • Sneak to teleport forward, damages user and any mobs in the way. Limit of 15 blocks.
  • Crafted with shield and ancient tablet
  • [ ] Ancient Armor
  • New armor set that lowers your maximum amount of health in exchange for abilities and power.
  • Each crafted with respective piece of diamond armor and an ancient tablet.
  • [ ] Mask
  • Blood Breathing enchantment - allows you to breath in blood (Water in the Undergrowth biome)
  • 2 Hearts
  • [ ] Robe
  • Adds +1 strength, stacks with leggings.
  • 3 Hearts
  • [ ] Leggings
  • Adds +1 strength, stacks with robe.
  • 2 Hearts
  • [ ] Boots
  • Adds +1 speed
  • 2 Hearts
  • Set Bonus: Left on one heart permanently but no longer need to eat food and can use any of the ancient gear without the blood toll from doing so.



## Bug Fixes

  • [ ] None
[1.0.2] Cavernous v1.0.2 by thxlotl on Oct 16, 2026
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# Cavernous 1.0.2

## Bug Fixes

  • Fixed mob conversion not working with entities riding other entities (eg. chicken jockeys or spider jockeys)
  • Fixed baby husks not converting (spawning) properly in cave biomes where they should.
  • Removed useless files

[1.0.1] Cavernous v1.0.1 by thxlotl on Oct 16, 2026
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# Cavernous 1.0.1

## Changes

  • Changed creeper poison cloud radius and effect duration to be slightly less powerful
  • Changed the "Breaking Ground" advancement to be based off of being in a cave biome rather than being under a specific height

## Additions

  • Added toggle to cavernous creepers, use "/function cavernous:disable_cavernous_creepers" to disable them and return them to their vanilla function

## Bug Fixes

  • Fixed minor issue with tags
  • Fixed "Caving in" advancement not working and giving an error message
  • Made arrows not trigger geysers
  • Changed compatibility pack to remove unnecessary files and potential errors with loading packs

1.19.3 Compatible version of Cavernous 1.0

Lacks some features of the 1.20 datapack like some new items in loot tables or features.
1.19.4 Compatible version of Cavernous 1.0

Lacks some features of the 1.20 datapack like some new items in loot tables or features.
[1.0] Cavernous v1.0 by thxlotl on Oct 16, 2026
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# Cavernous 1.0
Cavernous 1.0 is now out! Along with support for older versions of Minecraft, 1.0 includes some minor new features and bug fixes from previous versions, wrapping up the initial release of Cavernous.
## Changes

  • Cave spiders will now spawn in tropical caves
  • Overgrown temples loot now contain poison tipped arrows
  • Reduced frequency of underground beehive spawns
  • Tweaked biome placement - Less frequent caldera caves, more glowshroom caves, and other minor changes
  • Changed the roots in the ground in marshy caves to have mangrove wood on the interior surrounded by the former muddy mangrove roots
  • Added a function to uninstall/disable geysers
  • Changed loot tables for structures
  • Made dungeons more common
  • Reduced density of vines in tropical caves
## Additions

  • Added more carver types
  • Flat Ravines - Shorter ravines
  • Sinkholes - Very tall holes underground
  • Snaking Ravine - Long and thin ravines
  • Big amethyst geodes
  • Skeleton Miner - New mob that spawns rarely in place of a skeleton, drops head which allows players to see in the dark
  • Mossclad Skeleton - New mob which spawns in place of skeletons in the tropical caves, shoots poison tipped arrows and drops moss blocks
  • Torch Arrows - Crafted with one arrow and one torch, places a torch wherever it lands
  • Chain Arrows - Crafted with 8 chains and one arrow, drops a length of climbable chains wherever it lands downwards
  • Explosive arrows - Crafted with 1 TNT and 1 arrow, explode upon impact with the ground
  • Dynamite - Crafted by putting 1 TNT in a crafting GUI, allows the TNT to be lit upon being dropped from the players inventory
  • Added Icicles back to the icy caves in a slightly different way to avoid issues with colliding with other biomes.
  • Added a leviathan skeleton fossil that spawns occasionally at low y levels
## Bug Fixes

  • Fixed issue with bottle barrel loot table in thermal plant
  • Fixed issues with vanilla biomes not using the cavernous features, leading to things like the vanilla dungeons spawning occasionally, etc.
[0.2] Cavernous v0.2 by thxlotl on Oct 16, 2026
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Cave villages are now back in the game with a fully new look as well as a new lush variant of villages that will spawn in fungal, tropical, lush, and marshy caves! It also comes with amethyst and gold "trees" that generate underground in any biome occasionally.

NEW ADDITIONS:

Cave Village
  • Essentially the same as in older versions of cavernous, just with a whole new look and more variation in the buildings

Lush Village
  • A new variant of the cave village that will spawn in "lush" caves (any caves w/ plants in them loosely)

Gem trees
  • Can come in either amethyst or gold versions
  • Spawn rarely anywhere under y=0

New advancements

CHANGES:

  • Tweaked structure placement and frequency

BUG FIXES:

  • Husk spawner places incorrectly
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