It's very easy, Bungie can contact Game's Workshop and ask if they can use their intellectual property to do a badass cross over where: Ruinous powers are peeking in the solar system, and are corrupting everything into the chaos gods' influence. It should be very simple: https://www.games-workshop.com/en-CA/Copyright-and-Legal-Information [spoiler][quote][u][b]BLOOD FOR THE BLOOD GOD! SKULLS FOR THE SKULL THRONE![/b][/u][/quote][/spoiler] But please! Let's discuss how badass it would be if it did happen!