What are the differences between the Echo and having Hydaelyn's Blessing? [Spoilers?]

[Frederick22]

That's not what I meant. We beat Nabriales in combat, but as far as actually killing him, afterward with Moenbryda and Minfilia, we were helpless. We had no extra juice to add to that beam of Light and he would have likely beaten if not killed us. You don't actually know what Igeyorhm tried to do, she might well have wished to take advantage of our helplessness to try to get rid of us for good. Either way, the fact remains that we were helpless against a pure blast of darkness aimed at us. She only knew we were recovering the Blessing after having attacked us.

Im more confuse now, are we talking about our defences and how we fight Ascians? Or are we talking about blade of light ( the only way to kill an ascian ) ?
Why you said that we were helpless to fight Nabriales withouth the blessing, and now you say that we couldnt destroy him withouth Moen's sacrifice ?

As fas as I saw, having the blessing of light doesnt not give us the power to destroy an Ascian ( yet ), we still need sertain elements to do it. On 3.0 was Nidhoog's eye like an example.