User blog comment:General MGD 109/Who's the strongest demon/@comment-98.233.131.201-20130723214512/@comment-1509826-20130723220114

Okay I mostly agree with you, just a few points. One it has been stated. In Lucifer rising after she dies, Ruby says "and so as it is written, the first fallen will be the final seal" so Lilith is the first fallen demon, although I'm okay if that later gets reconed.

Agree with the other points. I would like to note that techniqually as the demons clearly didn't know much about the knife, its possible Lilith was simply not willing to risk it being able to kill her, as it seemed she didn't know she was the final seal just yet (though that does raise the question how did she learn).

I agree there is a lot of speculation, but they don't exactly have different immunities, all demons seem to have the same weaknesses, however the higher the demon the less the weakeness affect them till they become immune.