"The remaining wings glowed with black, and the girl's blood gave me a human form. I was no longer one of Lucifer's six pairs of wings, I had a human form and human emotions, and began to sink in the world."
The fallen angel left a feather in the human world and transformed into a new individual. Like vampires, this race was not created by God.
Evolution may be a kind of sadness. We can't see the way forward. Where should everything go?