User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-86.159.50.151-20120508103555/@comment-3045936-20120508132816

Ok, I agree and disagree with this. I agree that is not confirmed on if Levianthans are immune to Archangels powers. BUT Angels don't just refer to all none Archangels, or Cherub as they too are a completely different class of angels. Angels can refer to all angels as a collective term as while immensly more powerful, Archangels are just angels.

Also, and here is some insight. Whether or not Godstiel was stronger, equal or weaker than Michael or Lucifer he was at least in the higher Archangel power class. And the Levianthans were slowly breaking down his Soul enriched self. But they didn't take over until all the souls were gone. So that a possible theory that Archangel's supernatural powers at least work or are strong enough to work on Angels. And on the Superwiki of this site they put on the Levianthans page can kill angels. And they are worse when it comes to what is facts and what could be facts based off vague information in the series.