Terraria: How To Stop Corruption And Crimson Spreading In Hardmode

Quick Links

  • What Are Corruption And Crimson?
  • How The Spread Of Corruption And Crimson Works
  • Digging Holes To Stop Corruption And Crimson Spreading
  • Tips For Digging Quickly
  • How To Remove Corruption And Crimson From Your World

As soon as you enter Hardmode in Terraria, the world's Corruption, Crimson, and the new Hallow biome all start to expand outwards. Rapidly. If left to their own devices, these biomes will eventually swallow your entire world, destroying your NPC villages and making life generally difficult.

Thankfully, there are a variety of different ways you can remove Corruption and Crimson from your Hardmode world. This guide covers everything you can do to prepare for Hardmode's evil biome spreading, and what you can do in the endgame to remove it entirely.

Updated June 14th, 2022 by Jacqueline Zalace: Corruption and Crimson can be quite a pain to deal with. Because of this, we've updated this guide with more information on how to remove both of these evil biomes.

What Are Corruption And Crimson?

Corruption and Crimson are the main evil biomes of your world. Each world will spawn with either a Corruption or Crimson biome, though there are one or two rare seeds that will spawn both. You can choose whether you start with a Corruption or Crimson world before you start generating it.

The biome will determine which bosses you face, like the Brain of Cthulhu for the Crimson and the Eater of Worlds for Corruption. This will also dictate what sort of armor and weapons you can create before you enter into Hardmode.

Overall, these two modes are the same difficulty, so it's up to you which one you want to face in your world.

How The Spread Of Corruption And Crimson Works

Both biomes will slowly spread, even before Hardmode. They convert nearby blocks to the same biome at a very slow rate. Corruption and Crimson can spread through sand, mud, grass, stone, pretty much every default natural block in Hardmode, but in pre-Hardmode, they only spread through grass and bushes. Converted areas will have the same background music, spawn the same enemies, and grow the same plants.

Specific biomes, like the Desert or Snow biome, will have unique versions of the biome when converted into either Corruption or Crimson. For example, the Crimson Desert will spawn enemies like the Blood Mummies on the surface, and Dark Lamias underground. The Snow Biome has no unique enemies, but the Ice will convert to Red Ice.

Below, you can check out some helpful information about evil biomes.

  • Pre-Hardmode the biomes can only spread through grass blocks and the Crimson thorny bushes. This means you can just build a stone wall on the edge of your biome if you want to stop it from spreading.
  • Things get more complicated in Hardmode. Not only does the rate of spread increase significantly, but the evil biomes will also spread through stone and vines, which means Corruption or Crimson will spread underground, not just on the surface.
  • The rate of spreading is sped up as soon as you defeat the Wall of Flesh and enter Hardmode. However, this rate is then decreased once you defeat Plantera. This should stop the biomes from spreading super quickly if you haven't prepared your world. You can rush this boss, if you're capable, and reduce the risk of your world becoming overwhelmed.
  • Every Altar you smash (which spawns more Hardmode ores) will also increase the speed of Evil biome spreading. Be careful.

Digging Holes To Stop Corruption And Crimson Spreading

This method is completely time-consuming but is also probably the most effective way to prevent Crimson and Corruption from eventually ruining your world. It involves digging holes. Very big holes.

  • The system is simple: dig tunnels that entirely encase your Corruption or Crimson biomes before you defeat the Wall of Flesh.
  • Alternatively, you can dig tunnels that surround your base. Because 1.4 encourages multiple villages full of NPCs, this is a bit more difficult than it used to be, but might save you time.

You need to dig a surrounding tunnel that is at least 3 blocks wide, although we recommend going for 6, just in case. Imagine you're drawing a circle around your Corruption or Crimson biome. This trench will prevent the affected blocks from spreading past it.

Remember, vines can grow in tunnels and will spread Corruption. These will grow from underneath the grass blocks. Even though it's even more time-consuming, you should encase the tunnels in a cheap block, like stone, to prevent vines from growing along the dirt walls. It's extremely frustrating if the vines ruin all the time and effort put into securing your tunnels.

Tips For Digging Quickly

If your world is still in pre-Hardmode, you don't have access to some of the best mining equipment in the game. No super pickaxes, no drills, and no mega-buffs for mining. There are still some things you can use to make this process as smooth and as quick as possible. You can check out these mining methods below.

ItemWhat It DoesHow To Get It
Mining PotionsIncrease mining speed by 25%Crafted with Antlion Mandibles and Blinkroot (and Bottled Water) at a Placed Bottle.
Slice of CakeIncrease mining speed by 20%Sold by Party Girl
Ancient ChiselIncrease mining speed by 25%Found in:

  • Sandstone Chests
  • Oasis Chests
  • Mirage Chests
Deathbringer, Nightmare Pickaxe, or Molten PickaxeThese three pickaxes have fast mining speeds and can mine through tougher blocks.All three of these pickaxes can be crafted.

  • Check out our list of the best pickaxes for more information.

There is also the option that you carry out this job while Hardmode is already active. This means you'll have access to better mining items that can speed up the process. Watch out though! Make sure you're very quick with the tunnels, otherwise, you'll be chasing the Evil biome across your world as it spreads.

How To Remove Corruption And Crimson From Your World

If you don't dig tunnels in preparation for Hardmode, you might realize that your world is quickly becoming overrun with Evil biomes.

  • These corrupted biomes spread particularly quickly through soft blocks, like snow, and mud.
  • Deserts, Snow Biomes, and the Jungle are very susceptible to the quick spread of the corrupted biomes.

As a result, the Jungle biome can very quickly become completely overrun, removing the biome from your world.

If you speak with the Dryad, they will tell you how present the evil biome is in your world. This is helpful if you just have a small bit left that needs to be cleared.

Completely Removing Corruption And Crimson

To completely remove Corruption and Crimson from your world, you will need the following:

  • The Steampunker NPC
    • This NPC will only appear once you defeat at least one mechanical boss, which appear in Hardmode.
  • The Clentanimator
  • Green Solution
  • A stack of coins
  • The Clentanimator is a useful tool sold by the Steampunker in Hardmode, though she has to be living in a Jungle biome home. Come prepared, though, it's one of the most expensive items in the game. This tool can be used to both create and destroy biomes.

    Green Solution is the ammo you put inside the Clentanimator. When fired it replaces the Evil biome with whatever tile was underneath originally (referred to as "Purity.") Careful, though, this solution will also transform your Jungle into a Glowing Mushroom biome.

    The Clentanimator has a range of 60 tiles and is extremely satisfying to use.

    One problem is that it's quite hard to get rid of absolutely all of the Evil biomes. The best way to try and get rid of all of it (and finally satisfy the Dryad) is to dig a series of vertical tunnels and fire the Clentanimator side to side all the way down. This way you should be able to cover a good portion of the affected area.

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