Board Thread:General Discussion/@comment-25814498-20150505201606/@comment-27900912-20160308233952

I suppose Conjuring the water and earth would be simpler, although it would probably be equally possible with water-like aura and earth-like aura.

The fire one is definitely made of firey (transmuted) aura, as it is impossible otherwise.

For the air one, I guess it mostly depends on what could make air/wind "solid." Manipulation could compress the air. Transmuting wind doesn't make too much sense, sadly. And Conjuring it is impossible, since nothing like it exists naturally (well, besides that Plague Beast from the Dark Continent...).

Technically, Shu should be usable on air. Of course, most people wouldn't think about it, but my guess is that it probably could work. So maybe Enhancement could be used to "strengthen" the air.

All in all, if this ability were actually present in-universe, it probably wouldn't be dissected and explained :P. Not to say that explanation is bad, but that sometimes some things just defy explanation.