Quote Originally Posted by SuzakuCMX View Post
Light and dark aren't elements in this game.

Astral and Umbral are polarities applied to the elements .=.

EDIT: But that could let us have 2 summons for each element An astral and an umbral.
I didn't know that about the astral and umbral ... but that would definitely be pretty cool to have 2 different Primal summons per each element.