User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-210.6.33.107-20111012113035

Death is death, he's the opposite of life, who is God. They are two opposites of the same coin, one can not exist without the other, otherwise neither of them would have any actual meaning. Therefore, when life (God) first appeared, so did Death, they are the same age, which is assuming they have an age. What if they always were. We think of time as a linear thing with a beginning and an end, a very human perspective, but who says that this applies to either God and Death? On that note, who actually said that the buck stops there? In season one we did not know anything about angels and demons, only monsters. They were introduced later. Maybe we have not yet met the one above all (just a thought). Or maybe God and Death are the same individual? We've been trickstered before.

On the killing of Leviathans, Sam and Dean have proven to be able to beat (not kill) everyone with their wit so far. Even if God and Death were not able to destroy the Leviathans, maybe they could destroy each other. If I were Sam and Dean, I would find a way to make them rebel against each other and deal with the last Leviathan standing. Pretty much worked for the Angels.