User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-3481504-20120512031232

High-tier Leviahtans, like Dick, Joyce, and Edgar, can easily kill Angels. That I'm sure of. As simply as Edgar did in "Reading is Fundamental".

Yes, they, referring to Celestial beings, could do that, teleport, and whatnot. Cas would stand a great chance, as he is witty.

Like this:

An Angel could punch a Leviathan threw spaces, and attack it, but in the end, Leviathans like Edgar win.

Also, Dick said to Crowley he could and would (eventually) wipe out the demon population in a heartbeat, which is fast. Instantly.