Not sure I'd wanna link Grimm's obtaining souls with the creation of Faunus. And a reason why Faunus might not have been mentioned could be 'cuz they're still Human? So...they were mentioned? :P I see it as a phenotype that's recessively transmitted, like certain eye colors and hair color. Prolly shouldn't go on about my ideas for Grimm or Fauna getting started, in case it'll have bearing on this roleplay (After Co-GM planning), but feel free to discuss/debate in case it gives us ideas. :P