Resonant Element

A Military Artist with exceptional training and skill will eventually manifest an elemental affinity within their external burst type kei techniques. In the anime we see that Layfon Alsief has the wind Resonant Element. Gorneo Luckens Has an affinity with earth, while Nina Antock has a lightning affinity she channels through her A.R.M.S., also both Haya and Shante Laite are fire elementals.

It is suggested that players begin with a resonent element in mind, however it is also possible to create a character who does not yet know their element, and have it's discovery be a part of the story progression.