Underground Hallow

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.

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, 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.

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.

Contents

Characters

• Illuminant Slime
• Illuminant Bat
• Chaos Elemental
• Spectral Elemental 
• Enchanted Sword (NPC)
• Hallowed Mimic
• Hallowed PigronWhile overlapping an Ice biome in Hardmode

Hallowed Underground Desert:

• Dreamer Ghoul

Unique Drops

From Illuminant Slimes:

• Gel
• Slime Staff

From Chaos Elementals:

• Rod of Discord
• Chaos Elemental Banner

From Spectral Elementals:

• Spectral Elemental Banner

From Illuminant Bat, Illuminant Slimes and Chaos Elementals

• Apple Pie

From Enchanted Swords:

• Blade Staff

From Pigrons:

• Bacon

From Hallowed Mimics:

• Daedalus Stormbow
• Flying Knife
• Crystal Vile Shard
• Illuminant Hook
• Greater Healing Potion
• Greater Mana Potion

From any enemy:

• Hallowed Key(from any enemy, 1/2500 chance)
• Hallowed Key Mold(from any enemy, 1/2500 chance)  
• Soul of Light(1/5 / 1/3 chance)

From Fishing:

• Chaos Fish
• Princess Fish
• Prismite

From terrain:

• Pearlstone Block
• Pearlsand Block(Underground Desert)
• Hardened Pearlsand Block(Underground Desert)
• Pearlsandstone Block(Underground Desert)
• Pink Ice Block(Ice biome)
• Crystal Shard
• Gelatin Crystal

Music

• Underground Hallow
• Underground Hallow (Otherworldly)

See also

• Underground Corruption
• Underground Crimson
• The Hallow

History

 Desktop version

• Desktop 1.4.0.1:
  • Added Otherworldly Underground Hallow track from the cancelled Terraria: Otherworld.
  • Enemies in the Underground Hallow no longer drops the Blessed Apple.

• Desktop 1.3.0.1:
  • Enemies that spawn underground have a chance to drop the Blessed Apple.
  • Added Hallowed Mimic.

• Desktop 1.2.3: Added biome specific stalactite variations.

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

• Desktop 1.1: Introduced.

 Console version

• Console-Release: Introduced.

 Switch version

• Switch 1.0.711.6: Introduced.

 Mobile version

• Mobile-Release: Introduced.

 3DS version

• 3DS-Release: Introduced.