Board Thread:Warhammer 40k General Discussion/@comment-4851119-20140118095944/@comment-3258762-20140210091436

Callummacdonald79 wrote: Vaughn891 wrote: Well if the Emperor ordered him to do it he must have done something profoundly bad, like very very heresy level bad.

not necessarily - it may have been that the primarch in question had a very specific duty to perform. maybe this primarch wasn't of the same calibre as the rest of his brethren, physically and mentally, and after performing the single duty that emps had for him it may have been that emps saw no need to keep him (or her) around, and like the thunder warriors he removed what he felt was no longer of use - emps has a record of being utterly disdainful of that which is of no use and a primarch would be no exception.

of course it could be that it was something heresy level bad, but then that doesn't explain why the records were expunged. none of the traitor legions have been expunged and you would think that, at the very least, horus would have been the most viable candidate to be removed from imperial records. Highly doubt that, the Thunder Warriors were always meant to be tossed away when they had served their purpose. They were simple to create.

The Primarchs were not simple to create, and since the Emperor actually put some minor effort into making them feel like he was his father (In most cases, at least...even though he failed at 90% of it) he would probably not have disbanded any Primarch. I agree with Vaughn, it had to be some major thing. Probably not heresy per say, but maybe trying to integrate xenos into the Imperium or something.