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The Crimson is a biome which was added in the 1.2 update. The biome is an alternate version of The Corruption, and has a 50% chance to replace the Corruption in newly created worlds (only one of the two can exist and fully form at the start of a new world). Thus, it is functionally the same, with The Crimson also spreading further in Hardmode, infecting Snow and Desert biomes as well. It has several new enemies, Pulsating Hearts that resemble Shadow Orbs, and Crimson Altars which resemble Demon Altars. Entering hardmode will spawn a diagonal strip of Crimson that intersects with a diagonal strip of The Hallow, forming a V-shape. The Underground Crimson will not be created after defeating the Wall of Flesh if the world was originally created with Corruption, but it can be spread through artificial means.
The Crimson can be spread artificially by placing Crimstone Blocks, Red Ice Blocks or Crimsand Blocks near corruptible blocks, e.g. Stone Blocks, Ice Blocks. The Clentaminator can also be used to spread The Crimson. You can also use Crimson Seeds on Dirt Blocks to create artificial Crimson. 500 blocks of Crimson-related blocks are needed to create an artificial Crimson biome. More blocks could be required if there is a large amount of blocks related to another biome nearby.
The red appearance of the biome, the flesh-resembling tree leaves, the amount of insects and many gore-themed items obtained by Crimson materials suggests the biome's theme is based heavily on decaying flesh, instead of shadow-themed Corruption.
When 3 pulsating hearts are broken, the third heart will spawn the Brain of Cthulhu.
The Crimson biome does not have chasms like The Corruption does. Instead, it contains a more web-like structure; a large, circular open area that supports 4-5 branches leading to the hearts which can be considered as the core for The Crimson biome. The caves contain Crimson Altars in place of Demon Altars, however hitting them with anything other than the Pwnhammer will still harm the player.
The shape of these Crimson structures looks very similar to a human heart when viewed on the map.
The Crimson may be based on the movie War of the Worlds, as the Crimson is populated by creatures, blocks and foliage appearing to be made of organs or, like in War of the Worlds, blood.
The Crimson is a biome which spawns a variety of blood 'crawling' monsters.
Post-Hardmode, the Crimson gets several new monsters, which are:
All the post-hardmode monsters in The Crimson have a chance of dropping a Crimson Key, though this is extremely rare (1:2500 prior to 1.2.3). The Crimson Key can be obtained before the defeat of Plantera.
Weapons and Tools
- Blood Butcherer
- Tendon Bow
- Deathbringer Pickaxe
- The Rotted Fork
- Crimson Rod
- The Undertaker
- Blood Lust Cluster
- The Meatball
- Flesh Grinder
- Crimson Armor
- Vampire Knives (from Dungeon Chest)
- Ichor Bullets (crafted from Ichor and Musket Balls)
- Ichor Arrows (crafted from Ichor and Wooden Arrows)
- Golden Shower (crafted from Ichor, Souls of Night, and a Spell Tome)
- Ichor Darts (crafted from Ichor)
- Flask of Ichor (crafted from Bottled Water and Ichor)
- The Crimson looks like a heart or a human hand on the map.
- The Crimson was first shown in the image shown to the right, which is a Steam background image of the biome drawn by Jimmarn.
- Pulsating Hearts on the minimap (expandable fullscreen map) are labeled Shadow Orb when hovered (no longer true as of 1.2.3).
- The Corruption or The Hallow will not spread into The Crimson.
- You will know when creating a world that it will have the Crimson instead of The Corruption if it says "Making the world bloody" instead of "Making the world evil" during creation.
- You can also tell, more easily, by looking at the left half of the progress bar. If it is red, you have a Crimson world. If it is purple, you have a Corruption world.
- If one looks closely, one of the Crimson backgrounds features what appears to be a mountain-sized skull, dead trees, and some bones blending into the scenery. Another features prominent stone archways resembling vertebrae.
- Since the biome is based on necrotic tissue, the circular covered entrances to the Crimson chasms could represent "disease"-filled (aka enemy-filled) boils in the "flesh" of the biome itself.
- The Crimson is like a living biome that eats the world.
- The Meat Grinder is only dropped in Hard Mode.
- The Crimson tools, like the Blood Lust Cluster and the Tendon Bow resemble Daedric weaponry from the game The Elder Scrolls V: Skyrim, a role-playing game made by Bethesda.
- The Crimson will grow vines from the bottom of overtaken Dirt Blocks with grass on them, letting it spread downwards considerably more.
- On rare occasions the game will generate a crimson with the entrance to the underground crimson blocked by crimstone, this might be caused by the world generating the blocks normally (stone blocks in particular) then having said blocks be overlapped by the crimson biome being generated over it.
- Added to the game.