How to Stop Corruption Spread in Terraria
Stopping the spread of Corruption in Terraria is crucial, especially in hardmode! The best way is to dig a trench at least 6 blocks wide around the area you want to protect. Nothing can cross this gap, stopping the spread. Sunflowers can also prevent the spread pre-Hardmode, so don't forget those! For an extra layer of protection, line your trenches with Clay or any non-corruptible block. If all else fails, use the Clentaminator from the Steampunker NPC with Green Solution to cleanse the area.
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Honestly, just use the Clentaminator. It's the fastest and easiest way to get rid of Corruption. Remember, fighting Corruption is a never-ending battle in Terraria!
Purification Powder from the Dryad works too, for early game efforts. But yeah, trenching is the way to go for a long-term solution.
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