How do you stop Corruption in Terraria? Well, stopping it isn’t as important as containing it. That might come as a kick in the teeth to some of you, but it’s simply the truth.
For those preparing to enter hard mode, these are the steps you need to take to stop Corruption:
● Build Hellevators separating the biomes in your map.
● Connect these Hellevators with two horizontal tunnels that run across the map.
Suppose you’ve blasted ahead and smashed your way through the Wall of Flesh without any corruption preparation, though. In that case, you’re probably panicking right now about all the overgrown ugliness infecting your world.
All is almost lost, but not quite. If you’re keen on keeping your world, then you have A LOT of work to do to recover it.
However, you’re better off calling it quits and starting a new world armed with the knowledge of how to stop Corruption in Terraria before it’s too late.
Before diving into how to prevent Corruption, we need to have a little chat. You see, Corruption, or the corruption mechanic, can be split into three separate biomes as opposed to just one.
● And Crimson.
While functionally the same, we need to go over a few distinct differences between each biome. Otherwise, you’re going to be going into your corruption containment half-blind, and we don’t want that.
First up is Hallow. Unlike the Corruption and Crimson, of which you can only have one, the Hallow is a guaranteed post-hard mode spawn in every world regardless of seed.
Also, unlike the other two biomes, the Hallow is made up of fantastical, bright-color, fairytale-like themes as opposed to darkness, gore, and decay. It also can’t spread through mud areas found in the likes of Jungles and Glowing Mushroom biomes.
Don’t let its whimsical nature fool you, though. The Hallow is full of dangerous enemies and will spread like wildfire if you don’t deal with it.
Once both the Hallow and Underground Hallow biomes spawn, they will begin to spread. Pearlstone, Pearlsand, and dirt blocks with Hallowed grass growing on them will apply to neighboring blocks. It is also capable of spreading over any existing Corruption or Crimson blocks.
Corruption is a dark counterpart to Crimson. You can only have one of the two spawn naturally in your world, both pre and post-hard mode, although you can artificially build them both into your world.
Corruption is identified by its dark, dreary, purple themes of death and decay.
The Corruption extends underground through a series of chasms, each of which ends in a Shadow Orb.
Like both Crimson and Hallowed, Corruption spreads to any susceptible blocks in the vicinity of the pre-existing biome. It can also apply to Deserts, turning them into Corrupted Deserts. The only difference between regular Corruption and the Desert variants is the inclusion of several additional enemies in the latter.
Unlike Corruption, Crimson is identified by its stark red color palette. It spreads in an identical method to the other two biomes.
The primary functional difference between the Crimson and Corruption is that Crimson-exclusive enemies tend to have higher stats. To balance that, Crimson materials tend to be slightly more robust than those found in Corruption areas.
Crimson Chasms and the Crimson Hearts found at the end only spawn with Crimson biomes and do not form from spreading to new areas. The same method of applying is shared by Corruption.
How to Prevent Corruption in Terraria
Okay, that’s the general introductory information you need to know about the three spreadable biomes. Now we’re going to talk about what you need to do about them.
Almost all of this information pertains to preparing pre-hard mode. Once you defeat the Wall of Flesh and trigger the hard way, all three spread at much faster rates. Therefore, you need to be set up to deal with that in advance. Otherwise, you risk being overrun.
Preparation and Gear
Before we begin containing Corruption biomes, there are a few bits of gear you should try and get your hands on.
Mainly, this is going to deal with your mining speed. Containing these biomes involves a lot of mining. Without the following equipment and buffs, it’s going to take you hours as opposed to a single hour or two.
These are the following buffs you should stack up on before starting to contain Corruption:
● Slice of Cake.
● Mining Potion.
● Seafood Dinner.
The Slice of Cake isn’t a consumable despite looking like one. It’s a furniture item that can be placed and activated. Once activated, it will give you a 25% buff to mining speed for two minutes. This buff can be reactivated again once it runs out indefinitely.
To get the Slice of Cake, you need to talk to the Party Girl during a naturally occurring party at dawn.
The Mining Potion, on the other hand, is a consumable. It also provides a 25% buff to mining speed. This lasts for eight minutes on the console or 10 minutes on the PC.
To craft a Mining Potion, you need Bottled Water, an Antlion Mandible, and a Blinkroot. You’re going to want to brew about two hours’ worth of potions on a medium-sized world.
Seafood Dinner gives a significant improvement to all of your stats and has a large recipe consisting of:
● Armored Cavefish.
● Chaos Fish.
● Crimson Tigerfish.
● Double Cod.
● Flarefin Koi.
● Frost Minnow.
● Honey in.
● Neon Tetra.
● Princess Fish.
● Specular Fish.
● Variegated Lizardfish.
As well as your stacks of buffs, you’re going to want to get your hands on the following equipment:
● Ancient Chisel.
● Reaver Shark Pickaxe.
● Molten Pickaxe.
The Ancient Chisel is an accessory that increases your mining speed by 25%. By stacking this buff with our consumables, we’re effectively doubling our mining speed.
You can get an Ancient Chisel in Sandstone Chests, Oasis Crates, and Mirage Crates.
The Reaver Shark pick we’re using will be Light and is obtained through fishing in the Ocean.
Our other pick, the Molten Pickaxe, will also be Light and is used to mine the more complex blocks that the Reaver Shark can’t get through.
By alternating your pickaxes as needed and stacking all of your buffs, mining becomes almost twice as efficient, effectively halving the time it’s going to take to segment and contain all of your biomes.
Segmenting and Containing
Early in the game, and for all of pre-hardmode, Corruption spreads at a slow rate. In other words, you don’t need to worry about containing it until you want to push your world into hard mode.
So, spend some time building up your bases, farms, and all of the necessary equipment to contain Corruption efficiently. You’re in no rush, so take your time.
Once you feel comfortable with your world and you’re ready to take on the Wall of Flesh, you can start the following process.
Step 1. Vertical Segmentation
Our method of containing Corruption involves breaking the map up into a grid via vertical and horizontal segmentation. You will be mining out this grid, hence the intense focus on increasing your mining speed.
The reason we’re doing this is simple; Corruption, Crimson, and Hallow cannot spread more than three blocks. So, by creating a three-block wide gap between biomes and areas of interest, you’re limiting the movement of these biomes to those segments or sectors.
This has several different advantages aside from stopping Corruption. It is a valuable way to set up farms in the three spreadable biomes and allows for systematic cleansing if you decide you want a 100% purified world.
To start, you’re going to want to build a containment area for your base. This will act as a failsafe in case things go wrong.
You want to dig down on both sides of your base until you’re comfortably deep enough. These vertical tunnels need to be at least three blocks wide. However, Four or Six blocks wide gives you a bit of breathing room if you miss a block or two.
Once you have your two tunnels dug down, you want to connect them with a tunnel that is, again, at least three blocks high.
Once your base is segmented, you can move onto the other areas of your map.
Segmenting Your Biomes
You can segment as much of the map as you want. However, we suggest splitting the world up into quarters. The main idea here is to separate each critical area and biome from the rest of the world, so play with that measurement as you see fit.
Once you know how you want to space out your world, dig your vertical tunnel down along each dividing line, being sure to separate all of your biomes.
Unlike with your base, you want to dig down until you hit the lava. Make sure you keep up with a consistent four or six-wide tunnel, whichever you decided on.
At this point, you should have four vertical lines diving your world up, with each biome getting its sector. If needed, go in and add additional lines where you feel they are required. Once you beat the Wall of Flesh, you’re going to get other random Corruption biomes spawning, so you want to make sure it spawns into an area you already have contained.
Pay special attention to your pre-existing Crimson or Corrupted biome – locking them out individually from the rest of the map.
Giving Yourself Breathing Room
Dividing your map up like this is almost enough in and of itself. However, there are some additional steps you can take to secure yourself some more breathing room.
Take any non-corruptable blocks you have, Wood, Snow, etc., and line the ground around your tunnel entrances within six blocks of either size. As well as that, line the tops and bottoms of the horizontal tunnels you’ll dig in the next section with the same blocks.
Step 2. Horizontal Segmentation
With that done, it’s time for you to dig out your horizontal tunnels connecting the vertical ones. These tunnels are going to run across your entire world.
You should only need two of these long tunnels, effectively chopping your world into thirds horizontally.
This result should be a grid-like appearance, with your entire world, underground and above ground, separated into segments or sectors.
This completes your containment and should prevent any large-scale spread of Corruption.
Even after the new biomes spawn, once you go into hard mode, your map should be segmented enough that the new areas are already separated, isolated into individual chunks.
From here, all you have to do is enter hard mode and deal with the consequences. If any adjustments to your grid are needed, make sure you prioritize them.
The enemies in these biomes will likely be too strong for you to handle, so exercise caution if you need to venture into them to deal with the Corruption.
Once your map is all divided up and you kill the Wall of Flesh, you’re going to be entered into hard mode.
If you’ve followed our advice, all of the hard work should already be done. However, there are a few other things you can do in hard mode after the fact.
Jungles, in particular, should get a lot of your post-hard mode attention. Jungle biomes need to be rebuilt brick by brick, making recovering them from Corruption incredibly tedious.
Planting Hallowed Seeds or Pearlstone at the border of Jungles will slow down the spread of evil dramatically, buying you time to deal with the infection properly.
Hallow does not infect Jungles, so creating an artificial Hallow around your Jungle will combat both Crimson and Corruption.
Once your Jungles have been preserved, your focus should be on identifying the newly infected areas.
Hardmode will spawn Hallow and one of the two evils in a V shape randomly in your world. If you have segmented your map well enough, the affected areas should be easy to spot.
Take the time to deal with any necessary emergency actions resulting from the new spawns, being careful to avoid the new enemies.
Once you feel comfortable, you can continue generally playing, with your next milestone being the defeat of a Mechanical Boss. Defeating a Mechanical Boss will spawn The Steampunker. The Steampunker gives you access to the Clentaminator – a tool used to purify infected evil areas.
With the Clentaminator in hand, you’re able to start combating Corruption at its roots. This is an expensive undertaking, so make sure you have established effective money-making farms before attempting it.
Your primary method of cleaning your world is going to be by using Green Solutions. These solutions will cleanse large potions of the world quickly but don’t prevent the cleaned areas from getting re-infected.
This shouldn’t be too much of a problem for us, though, as we have quarantined individual areas of the world already.
However, using this solution will turn your Glowing Mushroom biomes into Jungle. This can be reversed, though, by using the Dark Blue Solution on your previous pockets of mushrooms.
Cleansing your world like this is the only way to deal with Corruption after hard mode, mainly if you haven’t segmented your world.
If you are in this boat, segment and cleanse your world as you go, doing pockets at a time until you have the nasty infection under control.
Some Extra Tips
That’s everything you NEED to know about stopping Corruption in Terraria. We do have a few additional tips for you, though.
● Killing Plantera for the first time will permanently slow the spread of Corruption by 50%.
● For a biome to be converted to Corruption, it needs to be infected with at least 200 blocks in console or 300 blocks on PC.
● The name given to the verticle tunnels that we build is Hellevators.
● Sunflowers can be a quick and effective preventative measure to take before hard mode. Once Corruption begins to spread underground, though, they become much less effective.
● Scarab Bombs can be used to mine out three-wide tunnels quickly. It is a less efficient method of complete segmentation overall.
That’s everything we have for you on how to stop Corruption in Terraria.
Ideally, you would have everything planned out before you hit hard mode. Plenty of people don’t know that, though.
So, if you have a world you’re fond of and are struggling to fight against Corruption, make sure your base is safe and start slowly making your way through it with a Clentaminator.
Don’t be afraid to start a new world if you need to. Terraria has a steep learning curve, so take that experience into a new map. Your entire experience will be better off for it.