Renegade Spehs Mereens

[Thaal Sinestro]

I think that it would be cool to transcribe the Horus Heresy story into an OV parallel. I also favor mixing in other media into these stories, so you could have the current "Chapter Masters" be people from other mythos.

We could grab a bunch of characters that are traitors in their original media and assign them to Astartes chapters. Like, for example, Starscream might be the head of one if the traitor chapters that is rebelling against the Emperor.

I see the loyalists also being led by other characters, like the standing lore for the Ultramarines is that they're controlled by Dredd as part of the police force.