Talk:The Corruption/@comment-132.234.251.222-20120104003910/@comment-89.107.164.22-20120107002653

In order to stop the spread of corruption in hardmode, the player may create a gap at least three squares wide containing no corruptible blocks as a buffer. It may contain other blocks, such as wood, but must be three spaces wide.

found it at http://wiki.terrariaonline.com/The_Corruption