Yang explained it to me a while ago when she first started training me. It's partially based on your nature and partially based on what you need. And Ruby said you can use it when your Aura's really strong. I got all of that. It's just a matter of letting it grow.

[He can think of all kinds of neat things it could be, but time will tell.]

...they didn't really tell me about Dust though. Just some basic facts. [That is to say, Weiss, please share.]