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The minute I reach the border of the underworld, fire imps start popping up everywhere, nuking me with fireballs from every conceivable angle. In addition, 3 huge skeleton worms show up ramming into me relentlessly.

The end result is that I'm hit by something at least a couple of times per second, knocking me around. Mining is impossible as I'm knocked into the lava if I even get close, and building some sort of fortress won't help seeing as all the monsters down here ignore walls completely.

I have 300 hp, 200 mana, full shadow armor and a nightmare pickaxe. How the hell do people survive down here?

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possible duplicate and highly related: How to survive an immortal imp army? – Raven Dreamer Jun 18 '11 at 23:01
I'm afraid building a stone grid won't help me here, Raven Dreamer – Hubro Jun 19 '11 at 16:13
+1 for yet another awesome out-of-context title – Nate Koppenhaver Jun 19 '11 at 23:14
You should also get an obsidian skull, which I believe requires some obsidian (pour water on lava) and some iron ore. – Zibbobz Oct 15 '13 at 13:10
up vote 13 down vote accepted

Find a place where below you there's a lot of ground (ash) and hellstone (no buildings or anything where the imps can spawn on). Dig a tunnel (width 2) under you (block fireballs with a fast pickaxe) and mine until there are no visible places to spawn for imps, other than your own tunnel (which you can even fill with dirt).

Then it's easy to mine hellstone while blocking the fireballs of the few imps with your pickaxe (always face the enemy while mining). There won't be many imps since they don't have much space to spawn.

A stack of potions, magic mirror and any flail (for worms) should then be enough.


(I think the tunnel in the image is too wide, but hopefully this still makes it more clear)

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+1 this is what I ended up doing – Hubro Jun 20 '11 at 21:27
fill up space in the tunnel with spare dirt and ash – jk. Aug 2 '11 at 6:41

Patch 1.0.4 increased the spawn rates and maximum spawn numbers quite a bit, and the Underworld wasn't a cake walk before that.

Some general tips for surviving:

  • Take less damage to avoid dying.
  • Bring some excess dirt and cover up all the lava in the area, first thing you do.
  • Bring a lot of health potions. At least one, maybe two full stacks.
  • Bring a powerful flail-type weapon, such as the Blue Moon, to deal with the Bone Serpents. If you've already got a Sunfury, even better!
  • The Muramasa is also effective against Bone Serpents, if less so; but, it helps tremendously with the Fire Imps: Its high swing speed will allow you to avoid most of their projectiles while charging at them, especially if coupled with Feral Claws.
  • Put off dealing with the Fire Imps until they overwhelm you or a Bone Serpent spawns. If you swing your Nightmare Pickaxe constantly, you should be able to swat most of their fireballs out of the air while you're mining the precious Hellstone. For this purpose, the Molten Pickaxe is not recommended, since it swings slower.
  • If you've established an escape route, you could try building a minimal shelter with a Bed, so you respawn right where you were slain. If you happen to run out of health potions and cannot escape, simply tear down the Bed to revert to your original spawn point, then return by Magic Mirror or dying.
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Blue Moon really makes things better. Head to the dungeon to snag one! – Robb Jun 19 '11 at 1:05
Or go dynamite-ing the bone serpents! You'll get mad cash to boot. – Raven Dreamer Jun 19 '11 at 2:16
The uses of Dynamite are pretty plentiful. I think i'll use some on my next visit to the underworld :) – Robb Jun 20 '11 at 15:13
@Robb Getting the timing right on the Bone Serpents is kind of difficult, and you can't use TNT to mine Hellstone. – a cat Jun 20 '11 at 15:16
@lunboks, oh right I knew that. Thanks for the reminder though on the Hellstone. – Robb Jun 20 '11 at 15:22

You should gather gold or shadow tool and weapons like the war axe of the night and the gold broadsword. You can also get a mini/mega shark to kill the boss that spawns in there. The highly recommended Armor and tools and swords are hell stone armor a molten Pickaxe and a firey great sword

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I am having problems down there too. Find the goblin NPC, he will show up at your house. If he isn't there he's near lava somewhere, anyhow buy rocket-boots. That way you can fly over the lava AND bring a fast pick-axe for those imps. The thing that gets me is Arch Demons. Hope this helps :D

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Things it would be important to have with you when you're in hell:

  • An Obsidian skull. This would be extremely helpful while mining hellstone and walking on other hot blocks.

  • Cross necklace. With all those enemies knocking you around, a few extra invincibility frames would help you out a lot.

  • Potions. You need to make sure to keep your health up.

  • Magic mirror, in case things get nasty.

  • Rocket Boots/Wings/Hook, so you can move quickly and vertically.

  • A ranged weapon, such as a bow or a gun, to keep those pesky demons away.

Hope my list helped!

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I think you should always a summoned minion such as the hornet,slime, or imp if you have hellstone. This should help keep some monsters off your back. Have something you can fly with or something that lets you walk in lava. Also have an obsidian shield to avoid being knocked into lava and being hurt when standing on hellstone. Have a fast melee weapon so you can charge imps without being hit. It would also help to have vilethorn to hit enemies through walls. Of course have lots of healing potions and even iron and obsidian skin potions if you have them to spare. It would also help to have a fast pickaxe so you don't always have to switch to sword to deal with imp fireballs. Also just make quick trips. Do not stay for prolonged periods of time so you do not get overwhelmed. Never stay in the underworld longer than you have to. After the WoF I only went back a couple of times. Hope my advice helps! :D

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