[all that is definitely very informative. lesser and greater spirits and their involvement with artes... whenever they return home, it's definitely something he'll bring up to rita and see if there's any possibility with doing something similar.]

Blastia utilize the power of something called aer. Through the use of formulas, blastia absorb air and can then be used for a variety purposes, ranging from protection to increasing one's strength.

[that's about as layman an explanation as flynn can give. ...which is still pretty confusing, sorry.]