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One bottle is only about +3 in every direction, flood fill. Keep piling those on, yeah, you will end up with a vast pall, but it's not unbounded.

This was a good idea. In practice, the only thing you need to clear out is thaumcraft.TaintedCreeper. Those are the ones gobbling up the spawn cap. @DrasticDemise - Maybe it would be good to provide a pre-set Command Block as a quest reward until there's some less awkward way to despawn taint...

Pretty sure that Gaseous Tenebrae from Thaumic Tinkerer has you covered. You throw it, it creates a cloud of shadows where it hits. Splash a few of those around, and you can grow mushrooms with sky exposure.