Corrupt Growth Wall

Tearing the wall out of an Underground Corruption leaves nothing behind, so every one you own came off a crafting station. Once made it behaves like ordinary building stock and can go anywhere, including a build nowhere near a corrupt biome.

Each corrupt wall pattern grew out of a specific cave wall. Growth is what the Worn Stone Wall becomes once the Corruption spreads through that stretch of cavern, while Mottled turns into Pustule, Fractured into Tendril and Stalactite into Mass. That change happens on its own and runs one direction. The only way back is a Clentaminator loaded with Green Solution.

The generated wall lets enemies spawn against it. What you place from the item does not, which is the practical reason to craft a stack: an arena dug into the Underground Corruption only goes quiet once you have re-walled the whole thing yourself.