I have used every single one of my skeleton keys on the undying mind strike to get that ideal fatebringer role. I have earned a total of 13 skeleton keys these past 2 weeks and I used them all to try to get the Imago Loop. No exaggeration, every single one of them turned into the ugly mark. I got 5 more today and all of them turned into the mark. I even tried doing it on other characters and no luck. Is my RnG that bad, or is it not a 50 50 chance for the imago? Seriously, it is ridiculous.