The Underworld

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BiomeBannerUnderworld.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. 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 Arch WyvernsOld-gen console versionMobile Version3DS version), and can contain unique Underworld-only loot.

Contents[edit | edit source]

The Underworld
Characters Unique Treasures Unique Drops
Hellbat.pngHellbat
Lava Slime.pngLava Slime
Fire Imp.pngFire Imp
Arch Demon.pngArch DemonOld-gen console versionMobile Version3DS version
Demon.pngDemon
Voodoo Demon.pngVoodoo Demon
Bone Serpent.pngBone Serpent
Wall of Flesh.pngWall of Flesh(boss)

During Hardmode:

Mimic.pngMimic
Tortured Soul.pngTortured SoulDesktop VersionConsole Version

After defeating a
Mechanical Boss:

Lava Bat.pngLava Bat
Red Devil.pngRed Devil
Hellfire Arrow.pngHellfire Arrow

From Shadow Chests:

Dark Lance.pngDark Lance
Sunfury.pngSunfury
Flamelash.pngFlamelash
Flower of Fire.pngFlower of Fire
Hellwing Bow.pngHellwing BowDesktop VersionConsole Version
Drax.pngDrax(very rare) Mobile Version3DS version

From Fire Imps:

Plumber's Hat.pngPlumber's Hat(rare)
Obsidian Rose.pngObsidian Rose(rare)

From Demons:

Demon Scythe.pngDemon Scythe(uncommon)

From Lava Bats,
Red Devils, and Hellbat:

Magma Stone.pngMagma Stone(uncommon)

From Red Devils:

Fire Feather.pngFire Feather(rare)
Unholy Trident.pngUnholy Trident(rare)

From Voodoo Demons:

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

From Arch DemonsOld-gen console versionMobile Version3DS version:

Crystal Shard.pngCrystal Shard(2-5) Mobile Version
Crystal Storm.pngCrystal Storm(0.2% chance) Mobile Version

From any enemy after
defeating Skeletron:

Cascade.pngCascadeDesktop VersionConsole Version

From any enemy
in Hardmode:

Living Fire Block.pngLiving Fire BlockDesktop VersionConsole VersionOld-gen console versionMobile Version(2% chance)
Hel-Fire.pngHel-FireDesktop VersionConsole Version

From vegetation:

Fireblossom.pngFireblossom
Fireblossom Seeds.pngFireblossom Seeds

From terrain:

Ash Block.pngAsh Block
Demon Torch.pngDemon Torch
Hellstone.pngHellstone
Hellstone Brick.pngHellstone Brick
Obsidian Brick.pngObsidian Brick
Obsidian Brick Wall.pngObsidian Brick Wall
Hellforge.pngHellforge
Shadow Chest.pngShadow Chest
Obsidian Door.pngObsidian Door
Obsidian Bed.pngObsidian Bed
Obsidian Table.pngObsidian Table
Obsidian Chair.pngObsidian Chair
Obsidian Work Bench.pngObsidian Work Bench

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 version 3DS 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 the Desktop version Desktop version, Console version Console version, and 3DS version 3DS version, the music track The Underworld plays (Desktop VersionConsole Version3DS version "Hell" Music Box). On the Old-gen console version Old-gen console version and Mobile version Mobile version, the music track Eerie plays.

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 VersionConsole Version
Achievement Rock Bottom (PC).png Rock Bottom • "The only way is up!"
Reach the very bottom of The Underworld.Desktop VersionConsole Version
Achievement Rock Bottom.png Rock Bottom • "Reach the bottom of the World"
Reach the very bottom of The Underworld.Old-gen console versionMobile Version
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.Old-gen 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.PS3

Gallery[edit | edit source]

History[edit | edit source]

  • Desktop 1.2.3: Fixed the bug where removing walls in the Underworld would not update the map.
Biomes and Structures
 
Surface Layers Forest • Desert • Ocean • Snow • Jungle • Mushroom • Evil Biome (The Corruption • The Crimson) • The Hallow • Space
Underground Layers Underground • Cavern • Dungeon • Underground Snow • Underground DesertDesktop VersionConsole Version • Underground Jungle • Underground Mushroom • Underground Corruption • Underground Crimson • Underground Hallow • The Underworld
Mini-Biomes Bee Hive • Granite CaveDesktop VersionConsole Version • Lihzahrd Temple • Marble CaveDesktop VersionConsole Version • Meteorite • Spider Nest
Structures and Other Biomes Chasm • Enchanted Sword ShrineDesktop VersionConsole Version • Floating Island • Heart ShrineMobile Version • Jungle Shrine/Jungle SanctumMobile Version • Living Tree (Living Mahogany TreeDesktop VersionConsole Version) • Pyramid • Ruined House • Underground Cabin
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