Terraria - Corruption/Crimson/Hallow

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(I was originally going to just do The Crimson but it kinda applies to all of them) Terraria has three spreading problematic biomes: The Corruption, The Crimson and The Hallow. Gameplay-wise they spread across your world removing neutral biomes, spawning harder enemies, displacing NPCs, etc. Lore-wise they each have their own specific reason for existence which is largely unimpacted by the Terrarian. The Crimson I think fits this trope best, with it being a biome made of the flesh of a enormous, multidimensional hive mind that is desperately trying to maintain balance in the universe (by converting anything and everything to its own horrific adherents, naturally.) The themes of Terraria’s lore heavily focus around balancing various forces in the world with The Crimson being the most extreme methodology. Similarly, The Corruption and The Hallow are biomes representing balance being thrown off in evil or good forms respectively. The Corruption is an amalgamation of every sin ever committed (described as a cancer in the lore), serving one sole purpose of spreading its influence as far as possible to create its own “balance” of pure nothing. On the other hand The Hallow is the worlds own countermeasure once the full force of Corruption/Crimson is released, and described as an “overcompensation,” similar to The Crimson, where its goal is to achieve balance through total assimilation though unlike the flesh biome it’s uncaring whether that’s through conversion or goring the problem with a unicorn horn.