The Underground Corruption is a Hardmode biome created after the Wall of Flesh is defeated for the first time. It is the underground version of the surface-level Corruption, appearing at and below the cavern layer. Just like the surface Corruption, it is mainly composed of Ebonstone and spreads to nearby tiles.
(Old-gen console and 3DS versions) Small pockets of Underground Corruption can be created through the breaking of Demon Altars, which can convert a single random Stone Block in the world into Ebonstone upon destruction.
The Underground Corruption does not suppress the spawn of other underground and cavern enemies. During Hardmode, all enemies killed in the Underground Corruption have a 1/5 (20%) / 9/25 (36%) chance to drop a Soul of Night.
Note: Most characteristics of the surface Corruption also apply to the Underground Corruption. See The Corruption for more extensive information.
This content is transcluded from Biome backgrounds § Underground Corruption.
On the Desktop version, Console version, and Mobile version, the following backgrounds are used. On the Old-gen console version and Nintendo version, the cavern layer background for any other biome the player is in is dynamically tinted purple.
- Desktop 184.108.40.206: Added Otherworldly Underground Corruption track from the cancelled Terraria: Otherworld.
- Desktop 220.127.116.11: Corruption chasms that extend into the underground layer are now classified as the Underground Corruption, complete with music. Unique enemies will not spawn pre-hardmode.
- Desktop 1.2.3: Added biome specific stalactite variations.
- Desktop 1.1: Introduced.
- Console-Release: Introduced.
- Switch 1.0.711.6: Introduced.
- Mobile-Release: Introduced.
- 3DS-Release: Introduced.