User blog comment:Enriant/Heaven and Hell/@comment-26982641-20160602080446/@comment-26271908-20160608020838

About the Knight's immunities, I agree they aren't only killable by the Blade. However, it was never proved on the show so it's little more than speculation, but, based on what we have, I would say that the Colt, the Scythe and the Primordial Beings could kill them - Yet, never proved, but being a supported assumption is better than nothing

But, Amara is their power source. If not of all of them, in the case not all having the Mark, she is at least Dean's and Cain's power source. But the Knights were rather impressive and would been surely in the level of a regular Angel

I never said Raphael would smite him instantly. I said he could destroy him easily. It would take some time but it would be not that long. And Castiel still used the souls far after. He never had true power to defeat Raphael. He used the souls and the Weapons of Heaven before becoming Godstiel and exploding him/her

Well, this is why we call it a retcon. They were clearly defined as something far different from an Angel so many times before it can drive someone crying just at the thought of a such a retcon. However, it is what have happened. I need to say that Dean's speech was really silly, but it is an official retcon (Well, personally, I don't consider them as Angels and I will never do. I just placed them in the blog because I was trying to get the bigger I could of classes of both so it would be expanded, but I really don't place them as Angels - It simply don't fit. C'mon, what kind of Angel is called April Kelly - Repeating: April Kelly)