The Underground Hallow is a dangerous 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 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 Crystal can also be found to summon the 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.
Additionally, small pockets of Underground Hallow can be created through the breaking of Demon/Crimson Altars, which has a
33.33*1/3 (33.33%) chance to convert a single random Stone Block in the world into Pearlstone.
- 电脑版 1.2.3：添加了生物群落特有的钟乳石变体。
- 电脑版 1.2：在此处（以及地表神圣之地）被击杀的敌怪现在有几率掉落神圣钥匙。
- 电脑版 1.1：引入。