User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-3045936-20120505183038/@comment-1509826-20120505185823

seeing that finally made sense, as to why god would go to the trouble of building purgetory for them, clearly there stronger than we thought, they simply never had the need to use there advanced powers before this point.

It also reminds me of how death described them, he called them "poisoness" and I think what we saw was what he ment.