Foschromia

Foschromia is a genetic condition where the eyes attract and hold mana contiuously, resulting in a constant glow. Normally when using magic, a person's eyes will glow in a temporary state of Foschromia that will fade after the spell (or series of spells in the case of master mages) is cast. In the case of someone with Foschromia, their eyes are always in that glow state, and glow even brighter when they cast spells.

Foschromia is most commonly found in Elves due to their high affinity for magic. However it can also be found in Chimera as well. The glow is always the same as the person's natural eye color. Those with the condition can see just as well as others, but they can better see at night.

Trivia

 * Fos roughly translates to "Light" or "Not Darkness" in Greek, while Chromia means "color".
 * When a person with Foschromia casts a spell, the aura from their eyes resembles that of Black Rock Shooter.