User blog comment:ImperiexSeed/Archangels are weak, don't you agree?/@comment-79.115.71.25-20151127175454/@comment-3045936-20151128234444

I don't know. But until an interview, or an episode says so. Leviathans can block any angel's power. As its canon that Leviathans can turn off Angels powers. It's vague so that is why Leviathans are only listed as a possible weakness.