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 dark rock with orange lines through it near the top followed by a spacious cavern. 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 surprise and kill most unprepared players.

The middle two quarters of the Underworld contain several Ruined Houses, which are Obsidian and the less common 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's locked Gold Chests, the Golden Lock Box from Dungeon Crates, or dropped from Mobile only.pngArch Wyverns), 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
Wall of Flesh.png Wall of Flesh

During Hardmode:

Mimic.png Mimic
Tortured Soul.png Tortured Soul Pc only.png

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
Obsidian Rose.png Obsidian Rose

From Demons:

Demon Scythe.png Demon Scythe

From Lava Bats,
Red Devils, and Hellbat:

Magma Stone.png Magma Stone

From Red Devils:

Fire Feather.png Fire Feather
Unholy Trident.png Unholy Trident

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

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
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, which drastically increases the danger of the Underworld. (Note: this can happen before hardmode, if a Mechanical 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 starts at 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.
  • Despite the more sequential boss difficulty, the Underworld is actually far easier to survive in than the Dungeon or Underground Jungle. A player should by all means explore the underworld as soon as they have a pickaxe that can mine hellstone, or even before if they would like to make use of Hellfire Arrows or the Demon Scythe spell, so long as they have sufficient means of avoiding the lava.

Achievements[edit | edit source]

Achievement It's Getting Hot in Here.png It's Getting Hot in Here"Spelunk deep enough to reach the molten underworld. "
Reach The Underworld for the first time. Pc only.png
Achievement Rock Bottom (PC).png Rock Bottom"The only way is up!"
Reach the very bottom of The Underworld. Pc only.png
Achievement Rock Bottom.png Rock Bottom"Reach the bottom of the World"
Reach the very bottom of The Underworld. Console only.pngMobile only.png
Trophy To Hell and Back.png To Hell and Back"You have gone to The Underworld and back without dying!"
Go to The Underworld and back without dying. Console only.png
Trophy Hellevator.png Hellevator"Go from the surface to The Underworld in under a minute."
Go from the surface to The Underworld in less than 1 minute. Console only.png

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.
  • In the 3ds version the bottom right corner of the underworld has a Super Mario World fire flower icon.
  • No background or foreground shaders can be applied by anything in the Underworld aside from normal lighting devices. This is apparent when fighting the Moon Lord, as blocks are not darkened, and the background is still visible.
  • When you get close to the Underworld, the screen will start to waver slightly, in a manner similar to the shimmering caused by heat.

Gallery[edit | edit source]

History[edit | edit source]

  • 1.3.3: Added heat distortion effect.
  • New background and soundtrack.The old soundtrack now used during the blood moon instead.
  • 1.2.4: The Underworld (as well as the Dungeon) has more new Furniture generated at world creation.
  • 1.2.3: Fixed the bug where removing walls in the Underworld would not update the map.
  • 1.2: Added Obsidian Furniture to ruined houses, and allowed rooms to generate horizontally. Also added Red Devil, Lava Bat, and new backgrounds.
  • 1.1: Demon Torches are added to ruined houses.
  • 1.0.6:
    • Ruined houses now spawn differently. They often spawn as all Obsidian Brick, and they can now get really tall.
    • Clumps of Ash are now filled with more lava pockets, making mining Hellstone more of a challenge.
    • Gold Chests are now replaced with Shadow Chests which now hold most underworld loot.
  • 1.0.5:
    • Water evaporates when reaching the Underworld layer.
    • Common Chests are now replaced with Gold Chests.
    • Grass and Dirt replaced by ash blocks.
  • Pre-Release: Introduced.
Surface Layers Forest • Desert • Ocean • Snow • Jungle • Mushroom • The Corruption • The Crimson • The Hallow • Space
Underground Layers Underground • Cavern • Underground Snow • Pc only.png Underground Desert • Underground Jungle • Underground Mushroom • Underground Corruption • Underground Crimson • Underground Hallow • The Underworld
Special Biomes Meteorite • Pc only.png Granite Cave • Pc only.png Marble Cave • Spider Nest • Bee Hive • Dungeon • Lihzahrd Temple
Other Living Tree • Pc only.png Enchanted Sword Shrine • Floating Island • Underground Cabin • Chasm • Pyramid • Jungle Shrine • Pc only.png Living Mahogany Tree • Ruined House