User blog comment:Primarch11/Guilliman Heresy/@comment-3245042-20120615121554

I'm rethinking my idea, but I'm not sure how its going to go down.

Here's what I have so far for the offical list of loyalist and traitors

Loyalist: Sons of Horus, Imperial Fists, Emperor's children, Space Wolves, Thousand Sons

Traitors: Ultramarines, White Scars, World Eaters, Blood Angels