Crimson spreading pre-hardmode [Solved]

[height]

Like the title says, the crimson on my world is spreading pretty fast although I haven't even beaten the WoF yet and the dryad is still telling me that my world is 9% crimson.
To be really sure I even marked both sides of the crimson, and it did cross the mark.

Someone please tell me if it's intended or not because I don't really want to start messing with that biome that early on.

[Elite Autiste]

From my experience, both crimson and the corruption biomes dig deep below the surface.

Meaning, it spreads into whatever hole that goes below.

If you got unlucky and it shares space with a jungle biome, then take a guess where the crimson spreads.

It'll barely be visible, but it'll be there.

Also sand tiles spread anything.

Top layer only? No. The entire thing. All of it.

[Lordsofeverythin]

what did you mark it with?

[height]

Originally posted by Lordsofeverythin:

what did you mark it with?

cobblestone one block above ground.

[Lordsofeverythin]

if you mark ity with a sunflower pre hard mode it cant spread past the flower unless it goes under
so dig a deep hole and have a sunflower as well

[height]

Originally posted by Billy the Blogposter:

From my experience, both crimson and the corruption biomes dig deep below the surface.

Meaning, it spreads into whatever hole that goes below.

If you got unlucky and it shares space with a jungle biome, then take a guess where the crimson spreads.

It'll barely be visible, but it'll be there.

Also sand tiles spread anything.

Top layer only? No. The entire thing. All of it.

So that means it spreads slowly even before hardmode?
And I didn't even notice it?

[ShinkuTear]

Corruption and Crimson can corrupt the following blocks, and possibly more: Dirt via grass, Mud via turning it into dirt, Sand, regular Stone, Ice. The damaging 'vines' in either biome, and regular corrupted vines, can also spread their corruption.

They cannot corrupt: Wood blocks, Bricks, snow, metal, ore, and anything else I didn't mention.

They can jump up to 3 blocks away from any corrupted block, so any Anti-Corruption barriers need to be 3 blocks thick and filled with something that cannot be corrupted, such as Stone Brick.

Same rules apply to Hallow, except for 1: Sunflowers will block Pre-Hardmode spread of Corruption and Crimson, but not Hallow. Hardmode makes them all immune to Sunflowers and cranks up the spread pace, but defeating Plantera, if I am correct, slows the pace back down to pre-Hardmode.

NPC housing can be made invalid due to too much nearby Corruption or Crimson, but not from Hallow.

[Bamblok]

Defeating Plantera slows the spread by 33.33%, but I'm not sure if that means pre-hardmode spread.

[CapsLockRAGE]

I believe it did spread pre hardmode, Just a lot slower.

[height]

Originally posted by ShinkuTear:

Corruption and Crimson can corrupt the following blocks, and possibly more: Dirt via grass, Mud via turning it into dirt, Sand, regular Stone, Ice. The damaging 'vines' in either biome, and regular corrupted vines, can also spread their corruption.

They cannot corrupt: Wood blocks, Bricks, snow, metal, ore, and anything else I didn't mention.

They can jump up to 3 blocks away from any corrupted block, so any Anti-Corruption barriers need to be 3 blocks thick and filled with something that cannot be corrupted, such as Stone Brick.

Same rules apply to Hallow, except for 1: Sunflowers will block Pre-Hardmode spread of Corruption and Crimson, but not Hallow. Hardmode makes them all immune to Sunflowers and cranks up the spread pace, but defeating Plantera, if I am correct, slows the pace back down to pre-Hardmode.

NPC housing can be made invalid due to too much nearby Corruption or Crimson, but not from Hallow.

Oh ok thanks, I understand now
So it does spread even before defeating WoF.

[height]

Originally posted by CapsLockRAGE:

I believe it did spread pre hardmode, Just a lot slower.

Yeah I never noticed it because I've always spawned with sunflowers that spawn right in front of corruption/crimson in previous worlds.