The Underworld

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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. Much of the solid surface consists of Hellstone, 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. If any Water enters the Underworld, it will quickly evaporate, but a water bucket can still be used to quench somewhat-smaller amounts of lava. Consider this if you have a large pool of water close to the Underworld which you don't want to lose.

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
Demon.png Demon
Voodoo Demon.png Voodoo Demon
Bone Serpent.png
Wall of Flesh.png
Wall of Flesh 

During Hardmode:

Mimic.png Mimic
Tortured Soul.png Tortured Soul Desktop VersionConsole Version

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
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

From Voodoo Demons:

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

From Arch DemonsMobile only.pngOld-gen console version3DS logo.svg:

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 Desktop VersionConsole Version

From any enemy
in Hardmode:

Living Fire Block.png
Living Fire Block Desktop VersionConsole VersionMobile only.pngOld-gen console version
(2% chance)
Hel-Fire Desktop VersionConsole Version

From vegetation:

Fireblossom.png Fireblossom
Fireblossom Seeds.png

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
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

Notes[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.
  • 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/Crimson (depending on which one your world generated with).
  • In the 3DS logo.svg version, the bottom right corner of the underworld has a Super Mario World fire flower icon.
Underworld Fire Flower.jpeg
  • 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 the player gets close to the Underworld, the screen will start to waver slightly, in a manner similar to the shimmering caused by heat.
  • On Desktop Version Desktop version and 3DS logo.svg version, the music track The Underworld plays (Desktop Version "Hell" Music Box). On Console Version Console version and Mobile only.pngMobile version, the music track Eerie plays (Console Version "Eerie" Music Box).

Tips[edit | edit source]

  • Protective accessories are a must here. An Obsidian Skull or any of its many upgrades will allow walking on Hellstone; A Lava Charm or any of its upgrades will protect from brief contact with lava. An Obsidian Rose can also reduce the damage from lava, but by the time you get one, you likely will have one of the other two items.
  • A player can dig a "hellevator", a vertical tunnel two blocks wide down to the Underworld, being wary of lava along the way or at the bottom. With fall protection such as a Lucky Horseshoe (or any upgrade thereof) or Wings, they can simply fall straight from the surface to the Underworld. (Occasional platforms will slow down the fall, but will also make getting back up much easier!) Within the tunnel, the close confines will prevent larger enemies from spawning, some other spawns will be reduced, and the walls will protect from most nearby spawns. (Fire Imps and other enemies which can attack through blocks will still be an issue.)
    • Other options for avoiding fall damage include:
      • Platforms at intervals close enough to avoid fall damage
      • The nervy can end their fall with the second jump of a Cloud in a Bottle or similar, or their various upgrades.
      • Running Rope down the hellevator, which also helps with going back up. Rope Coils will help speed this process up.
      • Another option is to end the Hellevator (or a section of it) with a pool of water (above the Underworld proper) or some Pink Slime Blocks at the bottom.
    • If widened to three or four blocks, with an additional three-block barrier of incorruptible blocks, a hellevator can be part of the player's defense against Hardmode's biome spreading.
    • A quick-and-dirty way to create a wide (but perhaps uneven) hellevator, is to simply make a small hole and drop a few stacks of bombs or dynamite down it. Once it gets deep enough for the explosives to detonate while falling, or if the tunnel drifts to the side, the player will need to go down and work from a lower level.
  • A very effective way to counter Fire Imps and Red Devils is with a minion. An Imp Staff can be crafted out of Hellstone Bars.
  • If the player explores the roof of the Underworld, they may find parts of an Underground Jungle.
  • Despite the sequential boss difficulty, the Underworld is actually much 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 one of the safer areas of the world, thanks to the the generally stronger enemies and spreading biomes.
  • One way to avoid most of the Underworld spawns is to stay in confined quarters while mining Hellstone:
    • You will certainly want a minion for this -- a Hornet Staff will do until you have your Imp Staff. Without a minion, you will need to block the imp's missiles until they teleport within reach.
    • The Ruined Houses are large enough to allow for some enemies to spawn inside, but replacing their back walls will squelch that. Tunnels and bunkers will also help.
    • Avoid using Stone Blocks for bunkers or bridges, because the smashing of Demon Altars may convert one or more stone blocks into Ebonstone/Crimstone or Pearlstone. While the native Ash blocks are incorruptible, either contagious biome can spread through a stone bridge or shelter, possibly converting enough blocks to produce spawns from that biome. These blocks may also be difficult to find when trying to completely purify the world. In any case, using any sort of Wood or Brick will avoid all problems from biome spreading.
    • The Ruined Houses usually have Hellstone veins butting up against them, and more embedded nearby in the ash. With care, a player can tunnel directly from shelter through the ash, leaving spaces for lava to drain away from the player as they mine. Obsidian Platforms and Water Buckets will be helpful here.
  • You can bring 50 pieces of Meteorite to the Underworld and thus create an artificial Meteor biome. The Meteor Heads will no longer drop loot once Hardmode begins, but may still be easier to deal with than the native spawns.
  • It is possible to flood most of the the Underworld, by digging channels to dump underground pools, or even an entire ocean, over the lava. The water will eventually evaporate, but not before it converts the lava surface to obsidian. Dumping an ocean will thus seal off the lava for that side's entire third of the Underworld (the middle third is blocked by the Ruined Houses); It will take some time for all the water to evaporate, and until it does the area will produce both Underworld and Ocean spawns.

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. Desktop Version
Achievement Rock Bottom (PC).png Rock Bottom • "The only way is up!"
Reach the very bottom of The Underworld. Desktop Version
Achievement Rock Bottom.png Rock Bottom • "Reach the bottom of the World"
Reach the very bottom of The Underworld. Old-gen console versionMobile 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 Version
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 Version

Gallery[edit | edit source]

History[edit | edit source]

Desktop VersionDesktop version

  • Desktop 1.2.3: Fixed the bug where removing walls in the Underworld would not update the map.

Console VersionConsole version

Mobile only.pngMobile version

3DS logo.svg3DS version

Biomes and Structures
Surface Layers Forest • Desert • Ocean • Snow • Jungle • Mushroom • Evil Biome (The Corruption • The Crimson) • The Hallow • Space
Underground Layers Underground • Cavern • Underground Snow • Underground DesertDesktop VersionConsole Version • Underground Jungle • Underground Mushroom • Underground Corruption • Underground Crimson • Underground Hallow • The Underworld
Special Biomes Meteorite • Granite CaveDesktop VersionConsole Version • Marble CaveDesktop VersionConsole Version • Spider Nest • Bee Hive • Dungeon • Lihzahrd Temple
Structures and Other Biomes Living Tree • Enchanted Sword ShrineDesktop VersionConsole Version • Floating Island • Underground Cabin • Chasm • Pyramid • Jungle Shrine • Living Mahogany TreeDesktop VersionConsole Version • Jungle SanctumMobile only.png • Ruined House • Heart ShrineMobile only.png
Promotional Content