User blog comment:Sorairo/Aura, Dust, and the RWBY Panel/@comment-99.90.70.202-20130823061805/@comment-15108745-20130823062701

Yeah, but it's been hotly debated on whether the word "dust" in the intro refers to or The latter is related to the phrase "In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return"
 * the substance "Dust" (as in the multicolored powder)
 * "dust" as in the ground of whatever planet they're on.