User blog comment:Tommy,Klaus&Kol2012+/How to Kill a Levithan/@comment-168.16.130.206-20120225192401

maybe a faustian bargain with Chaos and/or Nature(especially if the producers plan on using them in a likely season 8) or something that causes the brothers to release one villain to destroy another, even unintentionally, such as with Lillith and Lucifer