User blog comment:Supahbadmarine/By Tzeentch! Here We Go!/@comment-4608429-20130211210907/@comment-2253300-20130211213845

Good idea. Also FYI I was considering having one of the primarchs being a Blank. His Gene-Seed would make his Legion resistant to the Warp (not full Blanks) and in some it would turn them into Blanks. These individuals would be the Primarch's commanders.