User blog comment:General MGD 109/Odd off spring/@comment-3519940-20120229231806/@comment-3481504-20120302031802

At least get the facts straight. The Colt can kill anything except for Lucifer and four other things, and the the Demon-killing Knife can kill demons with the exception of Alastair.

C'mon, guys it's really not that complicated to comprehend, the show's given us the answers on this one.