User blog comment:Vivaporius/AT Idea: Imperial Civil War/@comment-3258762-20120408184922/@comment-4608429-20120409174739

We could have the Primarch, but to balance it out the Church has Saints, Sisters of Battle and Space Marines. You could even make the other sides Space Marines better than the Emperor's ones, by having Arik Taranis come out of hideing with a grudge. He could then with his knowlage of space marine biology help the Church create even more powerful space marines, and he and his remaining thunder warriors are now just as powerful as primarch.

Sound good?