When Light turns to Dark
And Dark turns to Light
Her wings will spread and embrace Her air
While the power rises among you.

If you seek a feather from the Spirit
Make them feel all things
Sadness, happiness, hidden concious for it
And they will guide you home.

A crappy poem, really, but essentially, light spirits hsve the ability to turn into the Light Fliers, the opposites of Shadow Fliers.