Cavern

The **Cavern** layer is the largest layer of the world, beginning just below the Underground and extending down until the Underworld layer. Darker stone background tiles characterize it. Stone is the predominant block in this layer (as opposed to Dirt in the Underground). Caverns contain occasional Underground Cabins where valuables can be found, as well as Glowing Mushroom biomes, mini-biomes like the Spider Cave, and occasional traps. In the lower areas of the Cavern layer, pools of lava can be found.

Furthermore, the Cavern layer contains the underground versions of several surface biomes: the Ice biome, Underground Jungle, Underground Desert, and Underground Corruption/Crimson and Hallow. A large section of the Dungeon also extends through the Cavern layer.

After defeating at least one Goblin Invasion, the Goblin Tinkerer NPC can be found in this layer. The Wizard NPC can also be found in this layer at any time during Hardmode.

## Contents

Characters
* ​Black Slime
* ​Mother Slime
* ​Baby Slime
* ​Giant Worm
* ​Skeleton
* ​Cave Bat
* ​Blue Jellyfish
* ​Piranha
* ​Salamander
* ​Crawdad
* ​Giant Shelly
* ​Undead Miner(uncommon)
* ​Vampire Miner
* ​Tim(rare)
* ​Nymph(rare)
* ​Pinky(rare)
* ​Cochineal Beetle(uncommon)
* ​Bound Goblin(after defeating the Goblin Army)
* ​Skeleton Merchant

In Hardmode:
* ​Armored Skeleton
* ​Digger
* ​Giant Bat
* ​Angler Fish
* ​Green Jellyfish
* ​Rock Golem
* ​Skeleton Archer
* ​Rune Wizard(rare)
* ​Bound Wizard

Critters:
* ​Fairies
* ​Mouse
* ​Gold Mouse(rare)
* ​Snail

Unique TreasuresFrom Gold Chests:
* ​Angel Statue
* ​Band of Regeneration
* ​Cloud in a Bottle
* ​Enchanted Boomerang(only on )
* ​Extractinator
* ​Flare Gun
* ​Hermes Boots
* ​Lava Charm(  only at lava layer
 all layers )
* ​Mace
* ​Magic Mirror
* ​Shoe Spikes
* ​Lucky Horseshoe(only on )
* ​Wolf Fang

Unique DropsFrom Giant Worm and Digger:
* ​Whoopie Cushion(rare)

From Cave Bat, Salamander, Giant Shelly, Crawdad and Giant Bat:
* ​Depth Meter(uncommon)

From Salamander, Giant Shelly, Crawdad, Mother Slime and Piranha:
* ​Compass(uncommon)

From Salamander, Giant Shelly and Crawdad:
* ​Rally(rare)
* ​Potato Chips(rare)

From Cave Bat and Giant Bat:
* ​Bat Bat(uncommon)

From Cave Bat:
* ​Chain Knife(uncommon)

From Giant Bat:
* ​Trifold Map(uncommon)

From Vampire Miner and Undead Miner:
* ​Mining Shirt(uncommon)
* ​Mining Pants(uncommon)

From Undead Miner:
* ​Bone Pickaxe(rare)
* ​Mining Helmet(rare)
* ​Steak(rare)

From Vampire Miner:
* ​Vial of Blood

From Piranha and Angler Fish:
* ​Robot Hat(very rare)

From Angler Fish:
* ​Adhesive Bandage

From Piranha, Skeleton, Undead Miner and Vampire Miner:
* ​Hook

From Tim:
* ​Wizard Hat(always)

From Blue and Green Jellyfish:
* ​Jellyfish Necklace(rare)

From Blue Jellyfish on Windy Days:
* ​Blue Jellyfish Kite

From Green Jellyfish:
* ​Megaphone

From Nymph:
* ​Metal Detector(50% / 100% chance)

From Cochineal Beetle:
* ​Red Husk

From Pinky:
* ​Pink Gel

From Skeleton:
* ​Ancient Iron Helmet(rare)
* ​Ancient Gold Helmet(rare)
* ​Bone Sword(rare)
* ​Carton of Milk(rare)
* ​Skull(very rare)

From Rock Golem:
* ​Rock Golem Head

From Armored Skeleton:
* ​Beam Sword(rare)
* ​Armor Polish

From Skeleton Archer:
* ​Magic Quiver(uncommon)
* ​Marrow(uncommon)

From Rune Wizard:
* ​Rune Hat(always)
* ​Rune Robe(always)

From terrain:
* ​Enchanted Sword(extremely rare)
* ​Terragrim(incredibly rare / only on )
* ​Arkhalis(incredibly rare / only on )

From Fishing:
* ​Blue Jellyfish (bait)
* ​Green Jellyfish (bait)(Hardmode)

Music
* ​Underground
* ​Alt Underground
* ​Underground (Otherworldly)

1. ↑ Spawns from Mother Slimes

## NPC happiness

* ​Clothier
 Disliked by | * ​Mechanic
* ​Party Girl
* ​Pirate

For more information, see NPC happiness.

## Gallery

### Backgrounds

This content is transcluded from Biome backgrounds § Cavern.

* Old rocky stone background used pre-1.2
* Smooth stone wall with rocks
* Smooth stone wall without rocks
* Stone wall covered in larger rocks
* Stone wall covered in medium sized rocks
* Crumbling stone wall
* Rocky stone wall
* Rocky stone wall with orange moss
* Cracked stone wall, matching pattern revealed by matching underground layer background

####  Pre-Underworld

* Old underworld background used pre-1.2, features very thin lava flow
* Twisting lava flow
* Thin lava flow with skulls in the rocks
* Very thick lava flow around large rocks

## History

PC version
* Desktop 1.4.0.1:
	+ Geysers now spawn on stone rather than under stone.
	+ Added Otherworldly Underground track from the canceled *Terraria: Otherworld*.

* Desktop 1.3.2: Geysers now spawn as traps.

* Desktop 1.3.0.1:
	+ Marble and Granite Caves can now be found anywhere in the cavern layer.
	+ Detonator traps added.

* Desktop 1.2.2: New "Alternate Underground" soundtrack.

* Desktop 1.2: Enchanted Sword (item) can now be found as a rare drop from the terrain.

* Desktop 1.1: Random traps added.

* Desktop-Release: Introduced.

Console version
* Console-Release: Introduced.

Nintendo Switch version
* Switch 1.0.711.6: Introduced.

Mobile version
* Mobile-Release: Introduced.

Nintendo 3DSversion
* 3DS-Release: Introduced.