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The change of background that marks the beginning of the Cavern layer.

The Cavern layer is the largest layer, beginning just below the Underground and extending all the way down until the Underworld layer. It is characterized by darker stone background tiles. 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 Mushroom Biomes, dangerous traps, rare and dangerous Spider Nest mini-biomes, and much more.

Lava begins to appear around -2100ft in small pools, which gradually become lava wells at around the -3000ft mark.

Map Size Min Start Depth Average Start Depth Max Start Depth
Small 120 ft 480 ft 840 ft
Medium 180 ft 720 ft 1260 ft
Large 240 ft 960 ft 1680 ft

Contents[edit | edit source]

Map view highlighting the Cavern layer range
Characters Unique Drops
Black Slime.png Black Slime
Mother Slime.png Mother Slime
Baby Slime.png Baby Slime
Giant Worm.png Giant Worm
Skeleton.png Skeleton
Cave Bat.png Cave Bat
Salamander.png Salamander
Desktop only.png
Crawdad.png Crawdad
Desktop only.png
Giant Shelly.png Giant Shelly
Desktop only.png
Undead Miner.png Undead Miner
Vampire Miner.png Vampire Miner
Console only.png Mobile only.png
Tim.png Tim
Nymph.png Nymph
Pinky.png Pinky
Cochineal Beetle.png Cochineal Beetle
Mouse.png Mouse

In Water:

Blue Jellyfish.png Blue Jellyfish
Piranha.png Piranha

In Spider Nests:

Wall Creeper.png Wall Creeper

In Hardmode:

Digger Head.png Digger
Giant Bat.png Giant Bat
Armored Skeleton.png Armored Skeleton
Skeleton Archer.png Skeleton Archer
Rune Wizard.png Rune Wizard
Ghost (enemy).png Ghost (enemy)
during Halloween

In Water in Hardmode:

Angler Fish.png Angler Fish
Green Jellyfish.png Green Jellyfish

In Spider Nests
in Hardmode:

Black Recluse.png Black Recluse


Dart Trap.png Dart Trap
Boulder.png Boulder
Explosives.png Explosives

From Giant Worms
and Diggers:

Whoopie Cushion.png Whoopie Cushion

From Cave Bat:

Chain Knife.png Chain Knife
Depth Meter.png Depth Meter

From Vampire Miner
and Undead Miner:

Mining Shirt.png Mining Shirt
Mining Pants.png Mining Pants

From Undead Miner:

Bone Pickaxe.png Bone Pickaxe

From Vampire Miner:

Vial of Blood.png Vial of Blood
Console only.png Mobile only.png

From Tim:

Wizard Hat.png Wizard Hat

From Nymph:

Metal Detector.png Metal Detector
50% / 100% chance

From Cochineal Beetle:

Red Husk.png Red Husk

From Skeleton:

Ancient Iron Helmet.png Ancient Iron Helmet
Ancient Gold Helmet.png Ancient Gold Helmet
Bone Sword.png Bone Sword
Skull.png Skull
(very rare)

From Armored Skeleton:

Beam Sword.png Beam Sword

From Skeleton Archer:

Magic Quiver.png Magic Quiver
Marrow.png Marrow

From Rune Wizard:

Rune Hat.png Rune Hat
Rune Robe.png Rune Robe

From terrain:

Enchanted Sword (item).png Enchanted Sword
(extremely rare)
Arkhalis.png Arkhalis
Desktop only.png (extremely rare)

From Fishing:

Scaly Truffle.png Scaly Truffle
(specific conditions)
  1. Spawns from Mother Slimes

History[edit | edit source]

Surface Layers Forest • Desert • Ocean • Snow • Jungle • Mushroom • The Corruption • The Crimson • The Hallow • Space
Underground Layers Underground • Cavern • Underground Snow • Desktop only.png Underground Desert • Underground Jungle • Underground Mushroom • Underground Corruption • Underground Crimson • Underground Hallow • The Underworld
Special Biomes Meteorite • Desktop only.png Granite Cave • Desktop only.png Marble Cave • Spider Nest • Bee Hive • Dungeon • Lihzahrd Temple
Other Living Tree • Desktop only.png Enchanted Sword Shrine • Floating Island • Underground Cabin • Chasm • Pyramid • Jungle Shrine • Desktop only.png Living Mahogany Tree • Mobile only.png Jungle Sanctum • Ruined House