Cave Update Add-on Version 3 (1.16) [Even More Blocks, Mobs, and Biomes!]

Explore new underground biomes, find new natural structures, encounter new cave themed creatures. fight a new boss, be spooked by classic cave sounds, and more in the Cave Update Add-on! This add-on adds many very needed additions to caves to make them exciting again. Check back for updates as more will be added in the future!

Video Guide Covering What's New!

Thanks to Bridge for making add-on creation faster and easier! If you're looking to make your own addons I would recommend using Bridge!

Enable Experimental Gameplay! 

New to Version 3:

Version 3 fixes 1.16 compatibility issues as well as adding a plethora of new features. These include 10 new blocks, several new enemies, 2 new underground biomes, new micro-biomes in caves, and more! If you can stand my goblin-ey voice, watch the video above for more details.

*All New desert stone variants can be crafted at the stonecutter.

Video Guide Covering Everything Else

Generated Structures:

All of these structures will generate in limited quantities. That means that they won't clog up your world by spawning infinitely! So, You don't need to worry about your mines being filled with random structures. You will only find these in unexplored caves.

End Portal Room:

The end portal room is the rares of the structures. It generates about as often as dungeons do. You can rely on finding one of these if the nearest Stronghold is too far away from your house.

Spider Nest:

This is a spide filled hole found in most caves. Falling in is very dangerous, but does yield substantial loot from all of the spider eggs!.

Ancient Nether Portals:

these portals were abandoned by their creators long ago and have since fallen into disrepair. They are missing most of their obsidian, but can be repaired!

...or just broken down for scrap...


Groups of vases now spawn naturally underground but are in limited supply. They drop comparable loot to spider eggs, however, they can also drop rusty iron keys. These are needed to open the new cave treasure chests.

Iron and Gold Chests:

These chests can spawn anywhere in the underground, with the gold chests predominantly spawning deeper down. Both chests require their respective keys to open: Iron Chests require rusty iron keys and Gold Chests require gold keys. Iron keys can be found in vases and gold keys can be found in iron chests. BE CAREFUL as sometimes these chests are not as they appear...


Bone Club:

The bone club is found exclusively in the previously mentioned chests. It does comparable damage to a stone sword but has permanent Knockback II. It is also UNBREAKABLE. Use it to send your foes flying away from you!

Friendly Spider Nest:

Not a conventional weapon, the friendly spider nest is a reward gained from defeating the Spider Matriarch Boss. It is a spider egg that continuously spawns friendly green-eyed spiders that will dispatch your enemies. You can recollect the egg by punching it a couple of times and picking it back up as an item. I would imagine this would be fairly useful in raids!

Cave Biomes:

Deep Desert:

Underground Desert:

The underground desert generates underneath both desert biomes and mesa biomes. Features special desert stone and desert colored ores.

Underground Jungle:

The underground jungle generates under jungle biomes. Features unique mossy stone patches and more plant life to give it a more jungle feel. Beware, dangerous monsters spawn here.

Underground Tundra:

Generates under tundra and ice spike biomes. Features special ice stone and large patches of packed ice and rare blue ice farther down.

Passive Mobs:

Villager Miners:

These poor villagers have become trapped and need your help to rescue them! They are found trapped in webs underground and you free them by punching the webs off. They are weak and require food to get the strength to follow you. Once you feed them, they will need to be lead back to the nearest village where they will reward you with XP and become a Miner themed Villager. They use any work stand that other villagers use and trade miner themed items.

Glow Worm:

Glow worms are friendly little worms that are found in all overworld caves. Fitting with their name, the glow worms actually glow! They act as dynamic sources of light in caves. You can lure them to specific destinations using brown mushrooms. They drop Glow Goo that when eaten, grants you night vision and it can be crafted into a Goo Lantern using 4 Glow Goos.

Ore Crawlers:

These little arthropods are found everywhere underground and drop their respective ore when killed. They run from the player, so you have to be quick! This update adds all of the different ores as crawlers now! You can find coal, iron, gold, lapis, redstone, and diamond crawlers now!


Every time you open a cave treasure chest, you run the risk of being attacked by a mimic. They deal lots of damage and resist knock-back so, early on, your best chance of survival is to run. I plan to add more types of mimics in the future such as barrel mimics and possibly ore mimics, so be on the lookout for future updates!

Hostile Mobs:

Undead Miner:

The undead remains of unlucky villager miners. They are a dangerous foe on account of their pickaxes. Drops bones and rarely ingots. Found underground below Y=40 or in abandoned mineshafts.

Brood Spider:

Large spiders that carry their brood on their abdomen, waiting to sick hordes of spiderlings your way. They are rare but pose a significant threat to early players when encountered, similar to endermen. Keep your distance when possible. Drops string, spider eyes, and a spider heart used to craft the boss spawn. Found underground everywhere and in higher levels in the jungle.

Spider Eggs:

Spider eggs don't pose a direct threat themselves and in fact, can offer loot when destroyed. However, they also release several spiderlings when broken in addition to their treasure. Spider eggs are found in Spider Nests that generate periodically underground. Treasure consists of cave themed items.


Small baby spiders spawned by Brood Spiders, Spider Eggs, and the Spider Matriarch. While they pose little threat by themselves, they are dangerous in numbers.

Bristle Spider:

A ranged spider that accompanies the Spider Matriarch during the boss battle. It fires a slew of bristles at the player.

More creatures are to be added in Future Updates...

Boss Mob:

Matriarch Spider:

The Matriarch Spider is the largest of the bunch and is not in the best mood when summoned. To summon the Matriarch Spider, one must craft the Matriarch Spider Spawn Block using 4 Spider Hearts and 5 string. Place down the block and break it to gain the spawn egg. The Spider Matriarch has 275 HP and switches between two attack modes depending on how far she is from her target. In ranged mode, she summons reinforcements in the form of spiderlings, brood spiders, and bristle spiders. She will periodically fire bristles at the player in this mode as well. When in Melee mode, she will summon only spider eggs but will also charge the player. A shield, a bow, and at least iron armor and sword are strongly recommended for this fight. The Matriarch Spider drops large amounts of cave related items including a friendly spider egg summoner!

Even more stuff...

There are many more small additions added in various areas throughout the underground. Prismarine shard and crystal ore in ocean biomes, more blocks, prismarite ingots, edible spider hearts, etc...

If you have any suggestions on what I should add, let me know!

Select version for changelog:


Matriarch Spider

 Name Changed to Matriarch Spider

 Updated bossfight

 Added new digging ability

Glow worms

 Are now leashable

 Are brighter

 Have fewer light glitches

Spider Eggs

 Are now more optimized for performance

 Have a slightly changed texture

 Added a subtle idle animation

Various optimizations to Vases, Glow worms, Spider Eggs, Spiderlings.


 Now drop Guano

 Are now leashable


 Added new sub-biomes in caves: Slime Caves and Honey Caves

 Added new enemies: Honey Slimes and Cave Creepers

 Added 10 new blocks

 Added new underground biomes: Underground Savannah and Underground Swamp

 Added new groups of enemies that spawn underground.

Fixed Various Bugs

Supported Minecraft versions

Installation Guides

655 Responses

Comments 655
4.3 / 5 (254 votes)
its cool but please make brood spider rarely spawn because i was being attack by spiderling coming out of nowhere and there no nearby caves around me how did spiderling get through blocks thats unfair
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I LOVE IT. Such a cool add-on but I am playing on Edu so none of the cave types generate but I have made many a map with the mobs and items as I still have access to those. I would really love if you could try fix it and make it fully compatible with Edu as there are very few that are. Amazing add-on! ^-^
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Stop commenting on this addon it will never have a update the last update was more than a year ago
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do u have any idea how long these take to make?
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If you ever do more with this addon after 1.18 or create a version with only mobs, an idea I have is making the Brood Spider/motherspider summon a bunch of baby spiders on death. Maybe with query.is_alive since I don't think summoning on death like a slime is a component yet.
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How do you make or find the boss egg?
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The Cave Update Is Amazing Addon That
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Could you add better loot in the chest? A desert temple has better stuff, and I didn’t find one chest naturally. And the snow stone and desert stone isn’t replacing the stone, but the ores are desert ores. :p
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is this coming to 1.17?
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Is this going to get updated since 1.17 is coming out or not cause its a really cool addon the only problem i have that its really laggy.
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really good but again they dont spawn naturall sort it out
please im on education edition btw
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this was one of my favourite mods and i've been using it for almost a year, but what with 1.16.100 i cant help but feel that some things are outdated. eg: the bone club can now be a real weapon, the chests and vases can be proper blocks, and thins like spider nests and other entity's like that would work better as blocks because as of now you can get them to teleport around like shulkers by putting them in certain situations. its been a long time since an update and you were one of the few creator's who didn't just make dumb mods like: "emerald armor addon!" or "cave update addon! (10+ new ores!)" which just copied mincraft's vanilla textures but recoloured it. you seemed to actually make original content and i would love to see more of your work. that's my request.
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I think the spider boss is a little too easy for iron armor I killed it with just iron and a bone club and I also noticed the brood spiders and bristle spiders didn't spawn probably because i stayed close and when she spawned eggs i could kill them with one hit

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the spider boss has a bug at the end where it does the animation and does it again after
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so i found out the when you kill spider boss it will keep doing the death animation over and over until you hit it
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Can you please make more mods?
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