Underground

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BiomeBannerUnderground.png
The change of background that marks the end of the Underground layer and the beginning of the Cavern layer below it.

The Underground is the first layer below the surface. It fills the area between the Surface and Cavern layers, beginning at a depth of 0ft and extending downward.

The Underground can be recognized by its distinctive background, which no longer contains naturally-placed Dirt Walls like surface terrain, but instead displays a unique backdrop with no naturally-placed walls. Players cannot remove this backdrop using a Hammer, nor can they place blocks in midair, as no wall generally exists here (though players can place their own walls, just as they can above surface terrain). Natural Underground blocks are generally similar to those in the surface.

The Underground is home to more aggressive enemies than the surface, as well as traps, Chests, and Underground Cabins.

True underground versions of biomes, such as Underground Snow or Underground Corruption, do not actually begin in this layer, but in the Cavern layer (with the exception of the Underground Desert, which begins in Surface terrain and extends through the Underground and a portion of the Cavern). In Hardmode, some blocks in the Underground can be converted into Hallow, Corruption, or Crimson.

Contents[edit | edit source]

Underground
Characters Unique Treasures Unique Drops
Giant Worm Head.pngGiant Worm
Blue Slime.pngBlue Slime
Red Slime.pngRed Slime
Yellow Slime.pngYellow Slime
Pinky.pngPinky(rare)
Mouse.pngMouse
Snail.pngSnail

In Hardmode:

Digger Head.pngDigger
Possessed Armor.pngPossessed Armor
Toxic Sludge.pngToxic Sludge
Jester's Arrow.pngJester's Arrow
Angel Statue.pngAngel Statue
Band of Regeneration.pngBand of Regeneration
Cloud in a Bottle.pngCloud in a Bottle
Enchanted Boomerang.pngEnchanted Boomerang
Hermes Boots.pngHermes Boots
Magic Mirror.pngMagic Mirror

Underwater chests:

Breathing Reed.pngBreathing Reed
Flipper.pngFlipper

From the Giant Worms and Diggers:

Whoopie Cushion.pngWhoopie Cushion(rare)

From vegetation:

Glowing Mushroom.pngGlowing Mushroom
Mushroom Grass Seeds.pngMushroom Grass Seeds

History[edit | edit source]

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