User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-76.95.86.12-20120519182004/@comment-5110811-20120520180458

We don't know if a leviathan can cut off an archangel's power. It's doubtful because the archangels have the strongest grace because of thier closest connection and bond to God. they are God's most personal creations. With Lucifer being his favorite son.

All angels beside beside the archangels and maybe the seraphs have a power connection to heaven. Eve and the Leviathans can cut off that connection, rendering them powerless.

The Archangels are completely self-sufficient, meaning they have unmeasurable powers without any need to tap into Heaven. So it stands to reason the leviathans can't cut off the archangels powers simply because the archangels are totally self-reliant in their powers.