Extended Caves

Extended Caves adds underground structures filled with treasure pots, mushrooms, decorations like stalactites and even more!


There is one dungeon and 3 cabins. They all can contain treasure pots randomly generated. Treasure pots have random useful items. Clay pots are common and quartz pots are rare. 2 new cabins were added in the Extended Caves 1.4+ update. They are the Cold biomes cabin and jungle biomes cabin.


Sweet mushrooms can be eaten and cooked to restore 6 points of hunger. Goldishrooms and shinyshrooms can be eaten to give you respectively Haste I and II. They can be used to craft the “Sticky stew” able to give you Haste III. Lumishrooms are purely decorative and emits light. The small and large fluoshrooms – They both emit light and can be found in jungle and swamp biomes. The rockshrooms – They can be found below level 24 and are pretty rare. All those mushrooms can be used to craft 2 differents stews with useful properties. You can get them in the crafting book once you find those shrooms.

Stalagmites and Stalactites

There are 6 variants of stalactites and 6 variants of stalagmites including double block ones. Purely decorative. You can get pebbles by destroying them. Pebbles can be an alternative way to craft blocks of stone.

– Lavastone :

A new type of stone that is generated near lava lakes.

– Limestone :

A new type of stone with stalactites and stalagmites variants.

– Pebbles :

They have been updated and there are limestone and lavastone variants.

– Rock piles :

Small piles of rocks made of stone, limestone and lavastone.

All stalactites, stalagmites, pebbles, piles of rocks can have a random direction when generated. You can gather small stalactites, small stalagmites, pebbles and piles of rocks with a silktouch pickaxe if you want to replace those decorations.

Cold Caves

You can find patches of ice, packed ice and blue ice into undergrounds of cold biomes. Cold biomes are the ones with either ice or snow on the surface.


There are hanging roots and different mosses. You can only find the frozen moss into the cold biomes it gives slowness to any mob getting into it. You can find fire moss growing on top of lavastones it sets on fire any mob getting into it. Dry moss and hanging roots are purely decorative and can be found anywhere underground.


They can be found under level 20 on top of lavastone. They are very rare. You can find the blue one in cold biomes, the orange one in deserts and the green one in swamps. They can be broken to get a effect crystal. They can be placed anywhere and give you an effect for 1 min when you right click on them. The effects reload after a random while and you can get the effect indefinitely.The Tempest crystal gives you speed, the Volcano one gives you fire resistance and the Cure one gives you regeneration.


Slime bulbs than can be found on mud. They give you slime balls. There are jungles mosses that grow in jungle biomes on dirt. You can find flint just like pebbles.


Extended Caves adds many new blocks including mud, marlstone powder, limestone, lavastone, dirstone, dirt cobblestone, mudstone, mud cobblestone, marlstone, marble, snowy bricks and icy bricks. Most of these can be made into stairs or slabs. Marlstone can be found in savannahs and badlands, marlstone powder can be used to craft clay. Mud and mudstone can be found in swamps. Dirtstone can be found in jungles.


Stews can be stacked. Sweet mushrooms can be put into smoker and campfire.

A mod by Polyvalord (mod page)

Updated on February 4, 2021

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