User blog comment:EmpyreanSmoke/Weaknesses/@comment-69.64.58.255-20151001035430/@comment-69.64.58.255-20151001035904

The people adding their fan theory keep saying that by the transitive property Leviathans can kill angels so they can kill archangels cus theyre angels too, and since Lilith, Azazel and Alistair are demons, and Leviathans can probably kill demons easily, all demons except the Knights can be killed.