User blog comment:Supahbadmarine/By Tzeentch! Here We Go!/@comment-9465750-20130212130355/@comment-2253300-20130212215020

What makes you think the new Primarchs appear during M41? Maybe in this At they come earlier. Generally my intention with ATs is to bring about some great final war between good and evil, but rather to set the stage for a unique setting. If I would do this At the coming of the New Primarchs would not be the start of some final battle. It would simply change the setting a bit.