User blog comment:Waters Knight/Monty Tweets About 'Dust Levels'?/@comment-10380701-20140514051036/@comment-3257939-20140514051707

I agree. While Ruby simply buys bullets made of dust, Weiss can use the dust to create spells. Similar to how Roman has two types of shots, the white one is less powerful than the red one.

Also, Jaune has a lot of aura but only knows how to use it as a forcefield to protect himself so we could call him Lv. 1 aura user while Ren is capable of using the same forcefield but not only around himself, he can also use it to create a shield or increase his own strength so we can call him Lv. 2 or 3 aura user.