How do you harvest tainted blocks or fibrous taint? A rift exploded, and after I killed the taint seed (spawn? i don't remember what the thing is called), the tainted blocks just disintegrated when I tried to break them. I tried normal shovel, normal pickaxe, silk touch shovel, silk touch pickaxe. The rift closer thing needs a lot of vitium essentia, and I don't know how to get it.
You have to leave the Taint Seed alive for a bit. The taint will spread. You can pick up the dirt with shovels and break tainted wood with axes, as one might expect. You can't pick up fibrous taint. But the important factor is keeping the seed alive.