>>96411262
>The first time they were deployed they wiped out the entire planet in a day because they weren't explicitly told to take prisoners
To be fair, the emperor always speaks in a mysterious and riddle-like manner.

>>213792805

You can keep the start of the Imperium to minimal flashbacks. Just starting the story with Horus Rising - False Gods - Galaxy in Flames trilogy is actually best way. If they make a profit start expanding the storyline.