I know I've recced this before but that's not reason not to rec it again (and again and again). It's one of my absolutely fave fanvids of all time.
I was watching it just now (for reasons) and I like the way it could easily sit in S10. Dean in Hell, Sam trying to save him and becoming a monster to do so. And the beginning of the apocalypse. Adore the song. Adore the editing.
& Nothing by Smokey FizzSource