User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-5110811-20150606210717/@comment-26106956-20150610071655

I think this explains it pretty well: I think you need to llok at it a different way. Archangels are the most powerful creatures after God and the Horsemen. They can affect the world on a scale nothing else can, and nothing is more powerful than them. They have the same weaknesses angels have, but with far more immunity, and only a few things can kill them. Now Leviathans on the other hand can be concidered the most Deadly/Dangerous creatures. The main strength of a leviathan is their raw physical abilities: Strength, speed, endurance, regeneration. Angels (this includes all forms: Arch, Seraph, Rit zen, cupids, reapers, ect) main strength comes from their energy, it is the source of their power for all of their amazing feats. Leviathans and eve are immune/able to turn this energy and/or able to turn it off. And we know that Leviathans are stronger than angels, monsters, demons, or anything else. they are the strongest Physical creature in the series. So it would come down to a leviathan negating the angel's power and then overpowering the angel, and then either doing the poisonous blood stab, or the Jaws thing and eat the angel.

I know some say that they can be teleported out or away, but I believe that as soon as an angel gets in a certain range of a leviathan, then their power is suppressed. when the angels came for kevin, they didn't even realize Edgar was what he was, and they were helpless. while Castiel who was far away and looking through cameras was able to distinguish between multiple leviathans. Demons were also able to tell when it was a leviathan, Crowley able to know that Dick Roman was a leviathan.

Another argument was the Leviathan able to stop demons, from using powers, or that demons were able to fight leviathan and since angels were stronger, angels would beat leviathan.

I believe the answer to this where the power comes from. Angels powers come from Grace, and grace comes from heaven, which is why lower angels need to be connected to heaven, the upper level angels can hold a massive amount, or even produce it themselves. Leviathans are immune to this grace energy, and can even suppress it in angels. Now leviathans have been shown, to be vulnerable to magic, and because of Henry winchester we know magic comes from the soul. Death had mentioned that the soul is extremely important, and we know that a soul can release power equal to a nuclear bomb from castiel. We also know that it is the soul that can overcome demons, and angels (Lucifer). when someone dies, The soul lives on, and can choose whether to move on or not. if not they become a ghost we should all know this. Ghost can be invisible to leviathan, because ghost are inbetween plains of existence, like angels and demons. leviathans exist solely on the physical plain. Demons are just mutilated ghosts, so the reason why the demons were able to affect leviathans, while not angels can't is because ghosts are souls, so souls can affect leviathans.

it's a rock paper scizors effect, leviathan beat angel, angel beat demon, and demon beat leviathan.

I know Dick threatened to wipe demons from the face of the world, but I think he was refering to the demon tablet and the demon trials. leviathans have shown no real aplitute to fighting demons, and i believe Crowley just had no idea what they were capable of until the end, like he said "they are just super monsters".

My last point is that a likely reason why castiel was able to hold all of the leviathan inside of him was because of the souls. all of those soul, which equals 30-40 million nuclear explosions of magical energy, was able to hold down the leviathan for that time. And it could be argued that as soon as castiel lost all of the souls, within seconds of it the leviathans took over.

I hope that i have answered any and all questions, any comments on this is welcomed.

Kurokitsune17 April 22 by A Wikia contributor