User blog comment:Tommy,Klaus&Kol2012+/How to Kill a Levithan/@comment-168.16.130.206-20120227022020/@comment-3481504-20120227023646

Well, so far, they've unleashed the demons in "All Hell Breaks Loose - Part 2", the Devil by Sam's actions, and by not stopping Cas from opening a window to Purgatory, the Leviathans as well.