Board Thread:Speculation House/@comment-27404492-20170511131216/@comment-26882656-20170605125520

Making smoke screens or... fog screens I guess.

It is assumed that Winter uses steam dust in her sword (the light blue dust crystal). She created a cloud to hide herself during her fight with Qrow.

And it would probably be a combination of fire and water dust.

And Mercury is also assumed to be using steam dust in his... projectiles.

And the geyser biome could also be using steam dust for its... geyers.