Underground Crimson

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The Underground Crimson is a biome. It is the underground version of the surface-level Crimson, appearing at and below the Cavern layer. Just like the surface Crimson, it is mainly composed of Crimstone and spreads to nearby tiles. Although it is available in pre-Hardmode, most of its exclusive contents will only appear during Hardmode. After the Wall of Flesh is defeated for the first time, a diagonal stripe of Crimson is generated, creating additional Underground Crimson biome.

(Old-gen console and 3DS versions) 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 destruction.

The Underground Crimson does not suppress the spawn of other underground and cavern enemies. During Hardmode, all enemies killed in the Underground Crimson have a 1/5 (20%) / 9/25 (36%) chance to drop a Soul of Night.

Note: Most characteristics of the surface Crimson also apply to the Underground Crimson. See The Crimson for more extensive information.


Unique Drops
From Pigrons:
From Crimson Mimics(Desktop, Console and Mobile versions):
From any enemy:
From terrain:
From Fishing:



This content is transcluded from Biome backgrounds § Underground Crimson.

On the Desktop version Desktop version, Console version Console version, and Mobile version Mobile version, the following backgrounds are used. On the Old-gen console version Old-gen console version and Nintendo 3DSNintendo 3DS version version, the cavern layer background for any other biome the player is in is dynamically tinted red.

See also