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
Serpent
Wall of Flesh.png Wall of Flesh
(boss)

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
(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
(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]

  • The Underworld starts at about 3000 feet deep in a large world, at about 2000 feet in a medium world, and at about 1300 feet deep in a small world.
  • If you stick around the roof in the top part of the Underworld, you may find parts of an Underground Jungle.
  • 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.
  • A very effective way to counter Fire Imps and Red Devils with your own minion. If you don't have one yet, your first priority should be to craft an Imp Staff out of Hellstone Bars. Then when you're attacked by a Fire Imp, click your Imp Staff on top of the enemy Fire Imp, and your Imp will take out the enemy imp. That will make mining Hellstone Ore much safer and faster.
  • 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.
  • After the Wall of Flesh is defeated and the world enters hardmode, the Underworld may become, ironically, the safest place because of the spreading Corrupt, Jungle, Hallowed, and Crimson biomes. You should have already gotten your own Imp Staff (or similar) so that when you defeat a Mechanical boss you will be able to effectively deal with the new 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.)
  • One way to deal with Red Devils and Lava Bats is to build temporary tunnels and bunkers as you mine Hellstone. But be careful to not use stone blocks, because later when you start smashing Demon Altars to bring forth rare ores, one of your stone blocks might get converted to Ebonstone/Crimstone or Pearlstone and although that will not spread underground Hallow or Corruption/Crimson, you will have a hard time finding it and completely purifying your world.
  • 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.

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 unlocking Hardmode, the game will draw in diagonal sections of Hallow and Corruption/Crimsoni(depending on which one your world generated with).thin 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]

Biomes
 
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