I have read that you must be a priest or lord of a Lunar cult, and an illuminate, to become an initiate of the Red Goddess. I wonder if Yelm (and other solar cults that are worshipped in the Lunar empire) is considered Lunar Cults when it comes to this rule. I know that the Red Emperor is considered a sort of "heir to Yelm" as being the emperor of Dara Happa. Or is it necessary to be a priest or lord to the Seven Mothers and other more "pure" Lunar cults.
I totally get that the Yelm worshippers in Pent or the Grazelands can't be initiates to the Red Goddess. But I am thinking about the aspect of Yelm that is linked to the Dara Happan aristocracy.