User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-3481504-20151217010910

This has been going on for FAR too long, time to come to a conclusion!

What angelic powers Leviathan can negate, will play a pretty big part in the outcome of the fight.

To be clear first off, I don't think Leviathan are immune to any angelic ability, but that they can negate some of their abilities.


 * Strength- They either can't negate an angel's strength, or choose not due to wanting to toy with their prey. In absolutely every single case, angels have always been shown to be able to tussle with Leviathan. Such as when Cas dealt some pretty heavy blows to two Leviathan in A Little Slice of Kevin.
 * Durability- At this point, it's pretty unclear if Leviathan can negate an angel's durability. Being more related to their physical powers, it might be the same as with negating an angel's strength. But at the very least, they don't seem to sustain as much damages when attacked by one than when a human is. Edgar plunging his hand into the two angels' vessels wasn't as impressive, as being fleshly, anything can penetrate through an angel's vessel (such as bullets, knives, etc), however it was the poison that actually killed the angels.
 * Teleportation- Leviathan can negate an angel's teleportation.
 * Telekinesis- Leviathan can negate an angel's telekinesis.
 * Smiting- Cas tried to smite one in its own domain, and couldn't.

Archangels, I would say, are at least six or seven notches than seraphs, if not much more. Also, Lucifer showed that angelic warding doesn't work on them, and the fact that they helped fight the Darkness, lends an incredible points in their favor. So I'd definitely say that archangels could overpower Leviathan, and would stand a far better chance surviving a full-on fight with one. Even a Leviathan's poison could kill an archangel, which an archangel might be able to survive and heal from, the Leviathan would never get the chance to do it without overpowering the archangel.

So, end of the day, I would say an archangel is stronger than a Leviathan.