Evil biomes

If you are looking for the official page of vanilla evil biomes, click here.

An evil biome is a naturally spreading, hazardous biome that has negative effects on entities inside or around it. The four currently-implemented evil biomes are the Corruption, the Crimson, the Defiled and the Riven, of which only one will always spawn upon world generation. There is a fifth planned evil biome known as the Ashen that will be released in a later content update of Origins in the future. With AltLibrary support in Origins, the player will be able to pick from any of the four randomly or any one by choice.

It is possible to create artificial versions of each evil biome by seeding 200-block areas with the other evil biome of choice. While this is traditionally done with materials brought over from another world, there is another option: if the Dryad is housed in a Graveyard during Hardmode, she will sell grass seeds from the other evil biomes. This allows for the obtaining of alternate materials offered from the other evil biomes.

While there are some consistencies with the generation of each evil biome, they still feature relatively unique world generation comprised of infected Ebonstone, Crimstone, Defiled Stone or Spug Flesh. However, the biome can overlap other biomes, providing corrupted versions of the Forest, Desert, Snow biome, Jungle or Ocean. This can be evidenced by grass and trees that take on different appearances in a similar appearance to their respective biomes.

While in pre-Hardmode, the only biome capable of spreading the evil biomes is the surface Forest, via infected grassy blocks.

Evil counterparts

Defiled Wastelands contents

Defiled Caverns contents

Riven Hive contents

Underground Riven Hive contents

Spread

All of the evil biomes spread except for the Ashen, claiming adjacent tiles to their own versions. Their capabilities of spread in pre-Hardmode are limited, but are capable of spreading faster and more aggressively once the Wall of Flesh has been defeated. Defeating Plantera for the first time reduces the overall spread of each by 1/2 (50%).

Evil Desert and Snow biomes

In Hardmode, the evil biomes can spread through a Desert or Snow biome transforming them into their respective evil versions. Both the evil Desert and Snow biomes are fairly similar to the regular evil biome types with the music and enemies being the same, except for some cases like the Eutrophic Sea for instance. The evil Deserts feature their own set of enemies alongside the typical evil enemies as well.

Evil Jungle biomes

Similar to the evil deserts, the evil biomes are able to occupy the Jungle and create their respective evil jungle grasses. This biome will still behave like the normal evil biome except that if a Green Solution is used, the tiles will convert back to Jungle Grass.

Purification

In Hardmode, the evil biomes can spread out of control; without player efforts, the evil biomes will together take over the entire world.

In pre-Hardmode, players can use Purification Powder to purify small portions of the Corruption/Crimson, and Sunflowers to block spread of infected grass. However, it is not until Hardmode that the spreading biomes become a major issue.

In Hardmode, a good strategy is to dig 3-tile-wide tunnels around the world evil, containing it. However, near the surface thorny bushes can spread the Corruption/Crimson up to 6 tiles, so the tunnels there need to be 6 tiles wide or lined with non-corruptible blocks. Thorny bushes do not exist in the Ashen, Defiled or Riven worlds.

Removing the world evil in whole, or reversing its spread in Hardmode, effectively requires usage of the Clentaminator. This can be purchased for 2000000 from the Steampunker, who arrives after at least one mechanical boss has been defeated. Using the Clentaminator with Green Solution (also purchased from the Steampunker) can purify large sections of the evil biomes. However, most players will want to keep some well-contained pockets of the biome, as the enemies there have unique drops (some of which are recommended to advance in the game).

The evil biomes are also blocked by the presence of the Hallow, and vice versa; even before obtaining the Clentaminator, seeding the Hallow is an alternate strategy to limit the spread of evil biome. However, this may mean eventually having to deal with an out of control Hallow in the future.

Trivia

- Drunk and Get fixed boi worlds always contain all of the evil biomes.