Making biomes

[wordofcurse]

Hey, I love building stuff and am kindof making my own little world... however, ive noticed some biomes seem to take priority over others? or perhaps it is the type of blocks used? For example, even a small amount of mushroom biome totally overtakes my nearby desert via soundtrack, background etc.
I guess my question is; is there some kind of biome priority list? Or some advice on how best to make your own biomes in your world? TYVM

[NightStar]

hallow, corruption, crimson, mushroom biomes tend to prioritize over other biomes. Mushroom seems to cover a larger range once it establishes than other biomes do in my experience. Maybe to make it easier to find underground.

Beyond the world evils and possibly Mushroom biome, the other biomes only prioritize themselves if there is enough blocks to even create their biome and then it doesn't seem to persist at the range mushroom biome does.
Graveyard biome range is dependent on the gravestones. Not too sure yet on the range it extends out.

That's really about all I know on the subject and it's mostly just my observations in game.
So all I can really say is if you want mushroom biome on the surface, expect it to prioritize itself over every other biome, next is world evils, Graveyard, and lastly all the other normal biomes. Seems like that's about as close to a biome priority order as you might get.

[wordofcurse]

Originally posted by NightStar:

hallow, corruption, crimson, mushroom biomes tend to prioritize over other biomes. Mushroom seems to cover a larger range once it establishes than other biomes do in my experience. Maybe to make it easier to find underground.

Beyond the world evils and possibly Mushroom biome, the other biomes only prioritize themselves if there is enough blocks to even create their biome and then it doesn't seem to persist at the range mushroom biome does.
Graveyard biome range is dependent on the gravestones. Not too sure yet on the range it extends out.

That's really about all I know on the subject and it's mostly just my observations in game.
So all I can really say is if you want mushroom biome on the surface, expect it to prioritize itself over every other biome, next is world evils, Graveyard, and lastly all the other normal biomes. Seems like that's about as close to a biome priority order as you might get.

That would seem to be my experience as well, good to have confirmation! TY.
Was trying to make an arena with multiple biome entrances to get loads of different enemies, but mushroom just dominates haha. Might have to try something else. Thanks again eh.

[Saver Sigonith]

Terraria biome priority is actually a pretty fascinating and complicated subject, since there's now three kinds of it!

Historically, the priority for fishing biomes did not line up with the biomes whose music and effects would play, and now that NPC happiness varies by biome they have their own priority list. And all three of these are based on where the player is standing rather than where the water or NPC is, so there's interesting things you can do with having blocks nearly out of range so that the biome shifts rapidly as the player walks back and forth.

I believe the NPC list (left) closely lines up with the music and effects,
https://steamcommunity.com/sharedfiles/filedetails/?id=3401036325
Sources[terraria.wiki.gg] here[terraria.fandom.com]
For spawns, I'm pretty sure the order is:
Meteor, Space, Dungeon, Graveyard, Granite, Marble, Corruption, Crimson, Hallow, Jungle, Mushroom, Snow, Ocean, Desert, Underground/Cavern/Underworld, Forest.
with the complication that several of these will happily hybridize and count as both.
Confusingly both wikis recount different versions of this list on their respective 'biome' pages and neither seem correct so I now have more questions.

Hope this helps!
Or at least makes things entertainingly worse.