[@mattmanganon] Hi there! Glad to see we have yet another willing [s]snackrifice[/s] player on our hands.

Now, regarding your Legion ideas, I don't necessarily have a problem with either of them... however, I think outright mutation of Rumisklinese into a beastman is beyond the point of too much mutation. Something like that would probably be considered a failure by the Emperor, and the offending Primarch would subsequently be killed off to as great an extent as possible, with their Legion erased from Imperial records as two of the Legions were in canon. Animalistic traits could be managed, given that Leman Russ may or may not have had literal wolf DNA in him, but outright mutation on that scale is too substantial even for a Primarch. As for Ruubai Han, he could ask for lesser Battle-Brothers to be considered Primarchs as much as he likes; all he's going to do is get himself and his Legion censured. Heavily, in fact, if he asks very frequently. Think "entire Legion forced to kneel in front of a very large crowd of people". That sort of censuring. Just so you're aware.