User blog comment:Maki Kuronami/Dust and Aura levels?/@comment-24828824-20140514064757

... yeah that does seem to make sense, i was first going to say it might be more about what color dust they are proficient with but the varying aplications of dust in combat make more sense.

let's see, how does this sound?

level 1 is dust for weapon power supply and regular ammunition(the standard mooks with dust powered SMGs), level 2 would be casting specific 'spells' with the weapon(Yang's fireballs, Ruby's special ammo, etc), level 3 would be using Glyphs for remote dust casting.(Weiss and Glynda)

and maybe some more levels in between relating to how many kinds of Dust they can use.