User blog comment:Calvincambridge30/Versus/@comment-27006668-20151022153447/@comment-3045936-20151024025918

Kriple confirmed the only part Archangels get from the Heavenly Connection was the power to return to Heaven. Hence why Lucifer couldn't just go back when he was free, but he also said it might have to with Michael being up there too.

As for if Archangels can attack an Leviathan if they don't block their power. I don't know as whom is to say. Other than tools like the First Blade, The Bone Method, or Death's Scythe, or entities like Death or God. I don't know as even if they weren't to negate their powers. Death described them as poisonous. Maybe they are naturally immuned to them too. Regardless no one can say for sure. Not you, seed, or myself.