User blog comment:CreatorTheta/Possible theory of Weiss's Semblance and how it mixes with the Dust/@comment-3146930-20131104113810

And we still don't know if Semblance comes from a person's Aura or if it a natural ability that some possess and others may not. I mean so far we have only seen Pyrrha, Ren, and Jaune use any kind of high level of Aura ability. However other characters like Ruby, Weiss, and Glynda have all shown to be able to use powers outside of those normally considered to be Aura and are called Semblance.

In my own opinion, if Aura comes from the soul, Semblance may come from the body. So for example, if Aura is powered by the strength of your soul, then Semblance may draw on a person's energy. This would explain why those with the power to create Glyphs can manipulate Dust, because Dust and Glyphs are both Energy. The user needs to manipulate the energy in their body to manipulate the energy of the Dust and then can channel it outward.

Aura seems to work more as a close range barrier to prevent harm to the person in question. However as I said, not everyone has been shown to use Aura at a high level and not everyone has been shown to use a Semblance at high level. The main reason I don't think Semblance comes from Aura is because the color of Pyrrha's Semblance didn't match her Aura, so the power of Semblance may come from someplace else.