Achievement hunters, rejoice! Completely cleansing Corruption and Crimson (as well as Hallow) from your Terraria world will give you the “And Good Riddance!” achievement. Thankfully, there are some easy ways to earn it with the Clentaminator and the Dryad NPC.
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How the Dryad NPC Helps You Get This Achievement
To check the status of your world, you need the Dryad NPC. By interacting with her and clicking “Status,” she can check how much of your world is “Evil.” The status will be a percentage showing the levels of Crimson, Corruption, and Hallow biomes in your world.
How to Get the Dryad NPC
The Dryad spawns once the following criteria have been met:
- The Eye of Cthulhu, Eater of Worlds/Brain of Cthulhu, Skeletron, or Lepus must be defeated.
- There’s suitable housing available for her to move into.
In detail, suitable NPC housing must be at least 60 tiles big, with a proper entrance like a door and crafted background walls. NPCs also require a source of light, a comfort item (Chair, Bed, Sofa, etc), and a flat surface item.
Use the Clentaminator or Terraformer to Get Rid of Evil Biomes
The Clentaminator is a handy tool that creates and removes biomes. With this purpose in mind, Green Solution ammo for the Clentaminator restores all evil biomes (Crimson, Corruption, Hallow) to their natural purity. The Clentaminator and all different Solutions are available from the Steampunker NPC. The Clentaminator costs 2 Platinum and 15 Silver—it’s a must-buy if you want to 100% Terraria.
The best way to get the “And Good Riddance!” achievement is by cleansing your world pre-Hardmode, before the spread rates of Crimson/Corruption increase and the Hallow biome spawns.
To increase your productivity, you can increase the Clentaminator’s range by making the Terraformer. First, you must have defeated the Moon Lord and thrown the Clentaminator into a pool of shimmer. Your shiny new Terraformer has a reach of 90 tiles and a width of 7 tiles. The Terraformer also has a 33% chance to not consume any biome Solutions, saving you time and money!
Armed with the Clentaminator or Terraformer, you can start cleansing! If the Evil biome is widespread, use a pickaxe or the Drill Containment Unit to create a series of tunnels to suit the width of your chosen tool’s range. Once that’s done, fire the purifying mist across all sides to get every nook and cranny. This way, all infected areas will be cleansed. Remember to check back with the Dryad to see your world’s current status.
Use Purification Powder for Small Cleaning Jobs
If you only have a small amount of Corruption or Crimson in your world, you can use Purification Powder to cleanse some remaining stragglers. Purification Powder is available from the Dryad for 75 copper each while a Blood Moon is not active.
Purification Powder reverts Corrupted and Crimson blocks back into their “pure” form. However, this does not work on walls. It’s also worth noting that Purification Powder doesn’t work on the Hallow at all, making it useless for Hallow biomes.
Since Purification Powder is single-use and can be time-consuming to cleanse large patches of Corruption, Crimson, or Hallow, there are better methods of getting the achievement, like using the Clentaminator/Terraformer.
The “And Good Riddance!” achievement is the most satisfying to get in the game, restoring your Terraria world to a fresh slate so you can 100% complete the game. If you’re in the mood for more Terraria challenges, why not dive into a rare world seed or try your hand at crafting the Zenith!