Board Thread:Help Desk/@comment-4264287-20140426013510/@comment-24407447-20140915131213

Okay. Let me clear something up. Corruption can spread through mud, but not Hallow. Also, keeping a bit of yor world Hallowed is necessary for collecting souls, same with Crimson/Corruption. Finally, put your house in the Hallow, or at least far from the Corruption/Crimson, since NPCs cannot live too close to corrupted/crimsoned areas. Just make sure your house is secure.