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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 numerous Ruined Houses, which are natural structures containing unique furniture and other loot. The Wall of Flesh boss needs to be summoned in the Underworld; defeating it will cause the world to convert to Hardmode.

The Underworld contains many hazards, most prominently its broad expanses of lava and several unique and difficult enemies. Touching Hellstone, the valuable crafting material only obtainable there, without proper equipment inflicts the On Fire! debuff and mining it releases lava. Furthermore, because the Wall of Flesh is summoned by dropping a Guide Voodoo Doll into lava, killing a Voodoo Demon positioned over lava can inadvertently summon it.

The middle two quarters of the Underworld contain several Ruined Houses, which are towers made from Obsidian Bricks and, less commonly, Hellstone Bricks 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, Desktop VersionConsole VersionMobile Version the Golden Lock Box from Dungeon Crates, or 3DS version dropped from Arch Wyverns) and contain unique Underworld-only loot.

Contents[edit | edit source]

Notes[edit | edit source]

  • The Underworld starts at about 3000 feet underground in a large world, at about 2000 feet underground in a medium world, and at about 1300 feet underground in a small world.
  • If any water enters the Underworld, it will quickly evaporate. Therefore, attempting to generate Obsidian here is usually not very effective, due to most of the water evaporating before touching any lava. However, a Water Bucket can still be used to quench somewhat smaller amounts of lava.
  • On the Desktop version Desktop version, Console version Console version, Mobile version Mobile version, and 3DS version 3DS version, the music track The Underworld plays (Desktop VersionConsole VersionMobile Version3DS Version "Hell" Music Box) in the Underworld. On the Old-gen console version Old-gen console version, the music track Eerie plays.
  • 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 LordDesktop VersionConsole VersionMobile Version here, as blocks are not darkened and the background is still visible, unlike in the rest of the world.

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

Tips[edit | edit source]

  • It is highly recommended to equip protective accessories when visiting the Underworld. An Obsidian Skull or any of its upgrades will allow walking on Hellstone and Hellstone Bricks and 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 due to its low drop chance, one of the other two items is most likely obtained first.
  • A very common method to quickly travel to the Underworld is to dig a hellevator, a vertical shaft from the surface to the Underworld.
  • Minions are a very effective way to counter Fire Imps and Red Devils. An Imp Staff is the best choice pre-Hardmode. Be careful not to let the minions kill any Voodoo Demons above lava pools, as a dropped Guide Voodoo Doll touching lava causes the Guide to die and the Wall of Flesh to spawn.
  • Since the Underworld spans the entire length of the world, it is easy to locate the Underground Jungle, Corruption/Crimson, and Hallow biomes. The bottoms of these biomes are often seen at the roof of the Underworld.
  • Despite the sequential boss difficulty, it is actually much easier to survive in the Underworld than in the Dungeon or Underground Jungle. In contrast to those biomes, the Underworld can be explored fairly safely. In Hardmode, before defeating a mechanical boss, the Underworld is one of the safest areas of the world because there are no new or more difficult enemies spawning there.
  • One way to avoid most of the Underworld spawns is to stay in confined quarters while mining Hellstone. Ruined Houses are usually a safe base to tunnel to Hellstone veins from. 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 for this method.
  • The Ruined Houses are large enough to allow some enemies to spawn inside, but replacing their background walls will prevent that. Tunnels and bunkers will also help.
  • It is very helpful to seal all lava pools, because that prevents both inadvertent Wall of Flesh summonings and accidentally falling into a pool. Furthermore, it serves as terrain preparation for the Wall of Flesh fight.
  • Avoid using Stone Blocks for bunkers or bridges, because the smashing of 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 native Underworld spawns can be overridden by placing at least 50 blocks of Meteorite, effectively creating an artificial Meteorite biome.
  • It is possible to flood parts of the Underworld by digging channels to dump an ocean over the lava. The water will eventually evaporate, but not before it converts the lava surface to Obsidian, sealing off many lava pools.

Trivia[edit | edit source]

Fire flower icon in the corner of the Underworld on 3DS version3DS.
  • 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.
  • In the 3DS version 3DS version, there is an icon of the fire flower power-up from the 1990 side-scrolling platform game Super Mario World in the bottom-right corner of the Underworld.
  • Just above the Underworld (if backgrounds are switched on), there will be the old background that the Underworld used to have.

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.