User blog comment:VedranTheII/Pretentious Diaries 2: What tricks would you teach your Aura?/@comment-10380701-20150718080559/@comment-26397825-20150718113129

Earth dust seems like it would be a great one for creating shields like the ice shield in No Brakes - it might just be personal preferrence that makes Weiss use ice dust first every time. She obviously has earth dust, because she gave a cartridge with an earth bullet in it to Blake.