See also: Corruption.
The Underground Corruption is a Pre-Hardmode Biome, being one of the biomes that spawns when the world is created. It is the underground version of the surface-level Corruption, and appears at and below the cavern layer. It operates similarly to surface Hardmode Corruption, being comprised of Ebonstone and Ebonsand, though it spawns different enemies. Underground Corruption spreads just like surface Corruption, and similarly can not spread to The Hallow (nor to Underground Hallow).
Note: Most characteristics of surface Corruption apply to the Underground Corruption, with the exception of the enemies that spawn. See The Corruption for more extensive information.
From Cursed Hammers:
from any enemy with about 1/2500 chance:
from any enemy with about 1/5 chance:
- 1.2.3: Added biome specific stalactite variations.
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