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Editors, please note: When updating information for items that existed prior to 1.3, remember that there are other, non-PC editions of the game to which the old information still applies. Try not to remove this older information as you add new 1.3 information.

The Underworld

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Biome Banner - Underworld.png

The Underworld (also known as Hell) is the deepest layer of the world, marked by a unique animated background depicting a large, open space with magma pools and pillars. It is a large, 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. It also contains several Ruined Houses, which are natural structures containing unique furniture and other loot. The Underworld is considered the most challenging biome prior to Hardmode.

The Underworld contains many hazards, most prominently its broad expanses of Lava. It also contains several unique and difficult enemies. Hellstone, of which much of the solid surface consists, is a valuable crafting material that can only be obtained in the Underworld; however it inflicts damage to players on contact without the proper equipment, while mining it also causes more Lava to form. Any Water that enters the Underworld evaporates.

The Wall of Flesh boss can be summoned here. Defeating it will cause the world to convert to Hardmode. It is possible to summon the Wall of Flesh accidentally, by inadvertently killing a Voodoo Demon positioned over lava. This is likely to kill most unprepared players.

The middle two quarters of the Underworld contain several Ruined Houses, which are Obsidian and Hellstone Brick towers that contain Shadow Chests, Hellforges, Pots, Obsidian Furniture, and other lootable items. Shadow Chests require the Shadow Key to open (acquired in the Dungeon), and can contain unique Underworld-only loot.

Contents[edit | edit source]

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
Console only.png Mobile only.png
Demon.png Demon
Voodoo Demon.png Voodoo Demon
Bone Serpent.png Bone
Serpent
Wall of Flesh.png Wall of Flesh
(boss)

During Hardmode:

Mimic.png Mimic
Tortured Soul.png Tortured Soul

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
Hellwing Bow.png Hellwing Bow
Pc only.png
Drax.png Drax
Mobile only.png (very rare)

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% chance)

From Arch Demons: Console only.png Mobile only.png

Crystal Shard.png Crystal Shard
(2-5) Mobile only.png
Crystal Storm.png Crystal Storm
(0.2% chance) Mobile only.png

From any enemy after defeating Skeletron:

Cascade.png Cascade

From any enemy
in Hardmode:

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

From vegetation:

Fireblossom.png Fireblossom
Fireblossom Seeds.png Fireblossom
Seeds

From 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

Tips[edit | edit source]

  • 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, commonly called a "hellevator" (even in other games.) Since you're in a two-block-wide space, monster spawn rates are heavily reduced, especially 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. However, this is no longer useful in any way during hardmode as meteor heads stop dropping loot once the Wall of Flesh has been defeated.
  • 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.

Notes[edit | edit source]

  • Just above the underworld (If Backgrounds are on) will be the old background the underworld used to have. It can be recognized as a warning that the player has gotten close to the Underworld.
  • After defeating the Wall of Flesh and releasing light and dark spirits into the world the game will draw in diagonal sections of Hallow and Corruption/Crimson. Within these diagonals water can exist in the Underworld because the biome within the diagonals are rewritten as Hallow or Corruption/Crimson. The water will not evaporate unless segments of the pool are outside of the diagonal.

Gallery[edit | edit source]

History[edit | edit source]

Biomes
 
Surface Layers Forest • Desert • Ocean • Snow • Jungle • Mushroom • The Corruption • The Crimson • The Hallow • Space
Underground Layers Underground • Cavern • Underground Snow • Underground Desert • Underground Jungle • Underground Mushroom • Underground Corruption • Underground Crimson • Underground Hallow • The Underworld
Special Biomes Meteorite • Floating Island • Granite Cave • Marble Cave • Spider Nest • Bee Hive • Dungeon • Lihzahrd Temple
Other Living Tree • Enchanted Sword Shrine • Underground Cabin • Chasm • Pyramid • Jungle Shrine • Living Mahogany Tree • Ruined House