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I would take the entire Deathwing to the moment Luther and the Lion are dueling and let them WITNESS the fething thing. Just for the kicks.

I would take them to Isstvan III and kill Abaddon. And Eidolon. Feth him.

split into 3 groups (and by extention times, I suppose):
25 marines go and back up Angron's Rebellion. By the fluff of marines, this should be more then enough.
25 marines go and kill Erebus and Kor Phaeron ASAP before the censure of the word bearers.
50 marines and I go and inform Magnus about the future and the dickery from tzeentch. From there, we visit the Big E, and explain chaos a bit, threats of the future, and the like.

 Tactical_Spam wrote:
Jump back to the fight between Horus and the Emperor. Wreck Horus'

And I realised I can't go to the Sol system... because arbitrary nonsense...

you could go to Mars first then travel to Sol?

Seriously why not just jump back to when Horus and the other traitor primarch's were 'created' and stop it at its source?