So now that part 5 has been out for a little while, what's your favourite theories about what the fuck is going on here? Yu'Vath or Umbra? C'Tan or Men of Gold? Or is it all a mysterious homebrew warp fuckery?

>I have no clue what you're talking about OP
If you don't know what Astartes is, then you're in for a treat! It's a fan-made Warhammer 40,000 animation following a team of space marines on a mission into a renegade ship. The 5th and final video of the first chapter dropped a few days ago, and it's 7 minutes of pure nerdgasm.

>B-but I don't know anything about Warhammer 40k??
That's fine, dude! It looks amazing either way, and you don't have to know any wh40k lore except that space marines are genetically modified humans walking around in full panzer suits, on a never-ending mission from the God Empreror to crush all aliens or heretics that threaten the Empire.

>OK, so where do I watch it?
Here's a playlist with all the videos that are out right now.
https://www.youtube.com/watch?v=2bko5GgK5v8&list=PLDNCCj46C34AgW7314tDcizn8qFcoENLO

I recommend watching all the videos in succession. The entire first chapter is less than 15 minutes, though I can't guarantee that you won't watch it over and over again.