I'm starting to put down rules for the invasion of the Stardust Empire, what in the fluff we are calling the War of the Emperors. Lord Kesharq came up with that title. It's basically an invasion of a heretical allied empire with an emperor who collaborates with xenos and Chaos.
Basic description of the rules.
I'm going to add a lot more later.
So far, I've created a map of all 34 worlds with paths of invasion between them for progression. Each world will have multiple territories, and some of them will provide benefits, with some of the worlds providing benefits to the campaign.