Now that we know what is the very source of Cain's power behind the Mark. How would each Archangel fare against Cain individually? With and without the first blade.
1.)Michael
2.)Lucifer
3.)Raphael
4.)Gabriel
Before anyone say this is spite, remember it took the combined effort of God and the Archangels to beat back the Darkness into submission. We know the Mark is both Lock and Key that imprisons the Darkness. We also know that Lucifer and Cain can tap into it's power.
I think it's at least implied that Cain might have the ability to kill the archangels. Maybe I'm wrong?