Defilement Powder

Defilement Powder is an item added by Defiled Lands. It can be crafted from Scuronotte, found in defiled dungeons or dropped by The Destroyer.

Using it on a block will instantly defile it, provided it can be defiled in the first place. Unlike passive defilement, this can be done regardless of the biome, making it the only way to defile blocks outside of defiled biomes.