Underground Hallow

The Underground Hallow is a Biome within the Underground layer which forms naturally as the Hallow spreads to the underground. This biome is defined by the presence of large amounts of Pearlstone Block within the underground layer. The Underground Hallow features several mobs unique to its environment, including the Chaos Elemental, Illuminant Bat, Illuminant Slime, and the Enchanted Sword. Monsters that die within the Underground Hallow the have a chance to drop a Soul of Light. This applies to both monsters unique to this biome, as well as any from other biomes that may happen to wander into it.