Death (Supernatural) is primordial grim reaper, the embodiment of death itself and one of the Horsemen of the Apocalypse but unlike other characters and like primordial being characters
He's primordial being that existing before universe and however if he's been destroyed to death and he will replace by billie
Also "This is one little planet, in one tiny solar system, in a galaxy that's barely out of its diapers. I'm old, Dean. Very old. So I invite you to contemplate how insignificant I find you" - Death's most famous quote
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