Another question about humans. So they can be master only in one specific area or it more depends on their age and experience? E.g. middle age warrior can master sword fighting and dancing. Where a guy in his early twenties can only have one mastery just because he is still young and there was not much time for him to really learn more skills above average level? 

Also are you bringing back some characters from old Chapters? Or this will be totally new group that just continues timeline ?