So Oryx can smell the blood, of his son, on us which means that if we dismantle every reward we earned from "killing Crota" and not the "raid itself" we will be sparred. So start dismantling your black hammers, your emblems and shaders, and anything else earned from specifically killing Crota if your like me and don't want to have to fight Oryx. Or you could, you know, just not buy the dlc