The Underworld

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The Underworld (also known as Hell) is the deepest layer of the World. It is largely an open cavity that stretches across the World's bottom, with a ceiling of Ash Blocks and a lower terrain of large Lava pools, Ash Blocks, and Hellstone ore. The Underworld is considered the most challenging biome prior to Hardmode, and is marked by a unique animated background that shows veins of flowing lava.

The Underworld contains many hazards, most prominently a vast amount of Lava as well as frequently-spawning and uniquely challenging enemies. Hellstone, of which much of the solid surface consists, inflicts damage on contact without the proper equipment, while mining it causes more Lava to form. Water that enters this layer evaporates slowly. An additional hazard is the Wall of Flesh, which may be accidentally summoned by killing a Voodoo Demon over lava.

Due to the fact that The Underworld provides access to large amounts of Hellstone, the main ingredient of Hellstone Bars, which are required to craft high-tier pre-Hardmode items, it is recommended to use this to craft said items. It is also where the Wall of Flesh, the final pre-Hardmode boss, may be summoned. Shadow Chests found here can contain unique Underworld-only items. The Demon Scythe, a rare and coveted magic weapon, may be dropped by Demons. Upon defeating one of the hardmode bosses, Lava Bats and Red Devils start spawning in the underworld.

The middle two quarters of the Underworld contains several Ruined Houses, which are Obsidian and Hellstone Brick Brick towers that contain Shadow Chests, Hellforges, Pots, and Basilian furniture. The Shadow Key is required to open all chests found here.

The area above the underworld, in hardmode, is a great place to search for ores as it is very deep underground.


The Underworld
Characters Unique treasures Unique Drops
Hellbat.png Hellbat
Lava Slime.png Lava Slime
Fire Imp.png Fire Imp
Arch Demon.png Arch Demon Mobile only.png/Console only.png
Bone Serpent Head.png Bone Serpent
Demon.png Demon
Voodoo Demon.png Voodoo Demon
Wall of Flesh Eye.png Wall of Flesh (boss)

During Hardmode:

Mimic.png Mimic (only the Shadow Mimic)

After defeating a Mechanical Boss

Lava Bat.png Lava bat
Red Devil.png Red Devil

Hellfire Arrow.png Hellfire Arrow

From Shadow Chests:

Dark Lance.png Dark Lance
Sunfury.png Sunfury
Flamelash.png Flamelash
Flower of Fire.png Flower of Fire
Drax.png Drax (very rare
on Mobile only.png

From Fire Imps:

Plumber's Hat.png Plumber's Hat (rare)
Obsidian Rose.png Obsidian Rose (rare)

From Demons:

Demon Scythe.png Demon Scythe (uncommon)

From Lava Bats, Red Devils and Hellbat:

Magma Stone.png Magma Stone (uncommon)

From Red Devils:

Fire Feather.png Fire Feather (rare)
Unholy Trident.png Unholy Trident (rare)

From Voodoo Demons:

Guide Voodoo Doll.png Guide Voodoo Doll (100%)

From Arch Demons; Mobile only.png/Console only.png

Crystal Shard.png Crystal Shard 2-5 Mobile only.png
Crystal Storm.png Crystal Storm (Very rare) Mobile only.png

From any enemy in Hardmode:

Living Fire Block.png Living Fire Block (2% chance) Pc only.png

From vegetation:

Fireblossom.png Fireblossom
Fireblossom Seeds.png Fireblossom Seeds

From the terrain:

Ash Block.png Ash Block
Demon Torch.png Demon Torch
Hellstone.png Hellstone
Hellstone Brick.png Hellstone Brick
Obsidian Brick.png Obsidian Brick
Obsidian Brick Wall.png Obsidian Brick Wall
Hellforge.png Hellforge
Shadow Chest.png Shadow Chest
Obsidian Door.png Obsidian Door
Obsidian Bed.png Obsidian Bed
Obsidian Table.png Obsidian Table
Obsidian Chair.png Obsidian Chair
Obsidian Work Bench.png Obsidian Work Bench


  • After hardmode, the Underworld will be, ironically, the safest place after everything is either Corrupt, Jungle, Hallowed or Crimson. However, once a Mechanical boss is defeated, Red Devils and Lava Bats will spawn. (Note: this can happen before hardmode, if a boss is summoned and defeated before the Wall of Flesh.)
  • You can dig a tunnel two blocks wide down to the bottom of the world. With a Lucky Horseshoe, Wings, or by jumping with a Cloud in a Bottle at the end, you can fall down this tunnel, sometimes called a "hellevator". Since you're in a two-block-wide space, monster spawn rates are heavily reduced, especially for the annoying Fire Imps. This gives you the chance to mine as much Hellstone as you want, but use caution when expanding this tunnel; a larger cave has higher chances of Fire Imp spawns.
  • You can bring 50 pieces of Meteorite to the Underworld and thus create an artificial Meteor Biome.
  • In a large world the underworld is about 3000 feet deep; in a medium world it starts around 2000 feet deep.
  • If you stick around the roof in the top part of the Underworld, you may find parts of an Underground Jungle.



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