Cavern

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

Map view highlighting the Cavern layer range

Cavern
Characters		Unique Drops
Black Slime  Mother Slime  Baby Slime  Giant Worm  Skeleton  Cave Bat  Salamander  Crawdad  Giant Shelly  Undead Miner  (uncommon) Vampire Miner   Tim  (rare) Nymph  (rare) Pinky  (rare) Cochineal Beetle  (uncommon) Mouse In Water: Blue Jellyfish  Piranha  In Spider Nests: Wall Creeper	In Hardmode: Digger Giant Bat  Armored Skeleton  Skeleton Archer  Rune Wizard  (rare) Ghost (enemy)  during Halloween In Water in Hardmode: Angler Fish  Green Jellyfish  In Spider Nests in Hardmode: Black Recluse  Traps: Dart Trap  Boulder  Explosives  (rare)	From Giant Worms and Diggers: Whoopie Cushion  (rare) From Cave Bat: Chain Knife  (uncommon) Depth Meter  (uncommon) From Vampire Miner and Undead Miner: Mining Shirt  (uncommon) Mining Pants  (uncommon) From Undead Miner: Bone Pickaxe  (rare) From Vampire Miner: Vial of Blood   From Tim: Wizard Hat  (always) From Nymph: Metal Detector  50% / 100%  chance From Cochineal Beetle: Red Husk	From Skeleton: Ancient Iron Helmet  (rare) Ancient Gold Helmet  (rare) Bone Sword  (rare) Skull  (very rare) From Armored Skeleton: Beam Sword  (rare) From Skeleton Archer: Magic Quiver  (uncommon) Marrow  (uncommon) From Rune Wizard: Rune Hat  (always) Rune Robe  (always) From terrain: Enchanted Sword  (extremely rare) Arkhalis  (extremely rare) From Fishing: Scaly Truffle    (specific conditions)

History

• 1.3.2: Geysers now spawn as traps.
• 1.3.0.1:
  • Marble and Granite Caves can now be found anywhere in the cavern layer.
  • Detonator traps added.
• 1.2.2: New "Alternate Underground" soundtrack.
• 1.2: Enchanted Sword (item) can now be found as a rare drop from the terrain.
• 1.1: Random traps added.
• Pre-Release: Introduced.