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The Underground Hallow is a dangerous Hardmode biome, being spawned when the Wall of Flesh is defeated. It is the underground version of the surface-level Hallow, and appears in the Cavern layer. It operates similarly to the surface Hallow, being comprised of Pearlstone and Pearlsand; though it spawns different enemies, along with Crystal Shards, a common Hardmode crafting material. Gelatin Crystals can also be found to summon Queen Slime. The Underground Hallow spreads just like its surface counterpart, The Hallow, and similarly will conflict with Corruption and Crimson, as well as their underground variants.

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

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

Additionally, on Old-gen console version Old-gen console version, Windows Phone version Windows Phone version, Old Chinese version Old Chinese version, Nintendo 3DSNintendo 3DS version version, and tModLoader 1 tModLoader 1.3-Legacy version versions of Terraria, small pockets of Underground Hallow can be created through the breaking of Demon/Crimson Altars, which have a 66.67*2/3 (66.67%) chance to convert a single random Stone Block in the world into Pearlstone.

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




This content is transcluded from Biome backgrounds § Underground Hallow.

On the PC version PC version, Console version Console version, Mobile version Mobile version, Old Chinese version Old Chinese version, tModLoader version tModLoader version, and tModLoader 1 tModLoader 1.3-Legacy version, the following backgrounds are used. On the Old-gen console version Old-gen console version, Windows Phone version Windows Phone version, and Nintendo 3DSNintendo 3DS version version, the cavern layer background for any other biome the player is in is dynamically tinted pink.

See also[]


  • Desktop 1.2: Enemies killed here (as well as the surface Hallow) now have a chance to drop the Hallowed Key Mold.