Underground Crimson

The Underground Crimson is a Hardmode biome, being one of the biomes that spawns when the Wall of Flesh is defeated. It is the underground version of the surface-level Crimson, and appears at and below the cavern layer. It operates similarly to surface Hardmode Crimson, being comprised of Crimstone and Crimsand, though it spawns different enemies. Underground Crimson spreads just like surface Crimson, and similarly can not spread to The Hallow (nor to Underground Hallow). on  Old-gen console,  Windows Phone,  Old Chinese, 3DS, and  tModLoader Legacy small pockets of Underground Crimson can be created through the breaking of Crimson Altars, which can convert a single random stone block in the world into Crimstone upon their destruction.

Underground Crimson does not suppress the spawn of other underground and cavern enemies.

A player is considered to be in an Underground Crimson biome when there are at least 300 crimstone/crimsand blocks near the player.

All enemies killed in the Underground Crimson have a 20*1/5 (20%) chance to drop a Soul of Night. In Expert Mode this increases to a 36*9/25 (36%) chance.

Note: Most characteristics of surface Crimson apply to the Underground Crimson, with the exception of the enemies that spawn. See Crimson for more extensive information.

Contents

Characters

• ​Blood Jelly
• ​Blood Feeder
• ​Crimson Axe
• ​Ichor Sticker
• ​Floaty Gross
• ​Crimson Mimic
• ​Crimson Pigron
  While overlapping an Ice biome in Hardmode

Crimson Underground Desert:

• ​Tainted Ghoul

Unique Drops

From Crimson Axes:

• ​Nazar

From Ichor Stickers:

• ​Ichor

From Floaty Grosses:

• ​Vertebra
• ​Vitamins
• ​Meat Grinder

From Blood Feeders, Blood Jelly, Floaty Grosses and Ichor Stickers:

• ​Monster Meat

From Crimson Mimics:

• ​Life Drain
• ​Dart Pistol
• ​Fetid Baghnakhs
• ​Flesh Knuckles
• ​Tendon Hook
• ​Greater Healing Potion
• ​Greater Mana Potion

From any enemy:

• ​Crimson Key
  (from any enemy, 1/2500 chance, only on )
• ​Crimson Key Mold
  (from any enemy, 1/2500 chance)
• ​Soul of Night
  (1/5 chance)

From vegetation:

• ​Deathweed

From terrain:

• ​Crimstone Block
• ​Crimsand Block
  (Underground Desert)
• ​Hardened Crimsand Block
  (Underground Desert)
• ​Crimsandstone Block
  (Underground Desert)
• ​Red Ice Block
  (Ice biome)

From Fishing:

• ​Crimson Tigerfish
• ​Hemopiranha

Music

• ​Underground Crimson
• ​Underground Crimson (Otherworldly)

Gallery

Backgrounds

This content is transcluded from Biome backgrounds § Underground Crimson.

On the  PC version,  Console version,  Mobile version,  Old Chinese version,  tModLoader version, and  tModLoader 1.3-Legacy version, the following backgrounds are used. On the  Old-gen console version,  Windows Phone version, and Nintendo 3DS version, the cavern layer background for any other biome the player is in is dynamically tinted red.

• 

  Blistered crimstone wall

• 

  Crimstone wall with red moss growing over the rocks

• 

  Alternative moss arrangement

• 

  Dark crimstone wall

• 

  Gray stone wall with blisters scattered

• 

  (Crimson Ice) Smooth red ice wall

• 

  (Crimson Ice) Bumpy red ice wall with Blood Jellies and eyeballs frozen within it

See also

• Underground Corruption
• Underground Hallow
• The Crimson

History

 PC version

• Desktop 1.4.0.1: Added Otherworldy Underground Crimson track from the cancelled Terraria: Otherworld.

• Desktop 1.2.4: Now has its own specific theme music.

• Desktop 1.2.3: Added biome specific stalactite variations.

• Desktop 1.2: Introduced.

 Console version

• Console 1.02: Introduced.

 Nintendo Switch version

• Switch 1.0.711.6: Introduced.

 Mobile version

• Mobile 1.2.6508: Introduced.

Nintendo 3DS version

• 3DS-Release: Introduced.