User blog comment:Zathronas/Analysis by an author: Dust secrets/@comment-3387274-20140828154938

The first episode described humans as being "born from dust". With that in mind I suspected for a  long while that aura and semblance may be conected to dust, but my theory was the opposite; humankind have those powers because of their conection to dust, rather than dust being formed out of those powers. It'll be interesting to see if either of us were right (or indeed both, since our theories are hardly mutually exclusive).