"I was there…the day Horus slew the Emperor"

Providers are desperate for decent content. This series has GOT potential. Series could start off at Ullanor victory. Set the players, then move through current and flashback events much like the book series... Has a contained plot, good arc, plenty of drama and plot twists... GOT darkness, in the distant future? With hopefully a better ending (cough Emperor killed Sanguinius…).
I vote live action. I want cool character actors. Lutein as Producer, Baldermort, Aboarder Prince, Bruva Alfabusa as narrators, Majorkill gets a recurring character. Jk world isn't that perfect...

For the Emperor! 

Cast ideas? 

Dwayne Johnson as Manus?

William Dafoe as Kurz?

Who plays Horus? Lokkan? Abbadon?