User blog comment:B214/Question and Answers 6/@comment-185.112.105.215-20170112041718/@comment-29963364-20170112092604

Since Fallen Angels were originally "Pure" Angels, and were therefore created by the Biblical God, they still possess the "Holy Light of God" within them.

They are just recognized by the [Heaven System] as enemies and are no longer "blessed" by God. So they lose their halos, and their wings turn from white to black. Signifying their "fall" from God's grace.

Their Light Power doesn't change, nor does it's characteristics. It's still Holy Light. The dinamic of the Three Faction's powers and who they hurt can be a little confusing, so here's a quick run-down:

 Devils  -- Hurt by Light Power

 Angels  -- Hurt by Demonic Power

 Fallen Angels  -- Hurt by Demonic Power & Light Power

The Fallen Angels get hurt by both powers, while Angels and Devils only get hurt by one type.