I Turned into a Golden Eagle

Reborn as a golden eagle, commonly known as the "prison-for-life eagle."

He had thought that soaring through the sky and flying free would be all there was to his life as an eagle.

But a golden rain transformed the entire world.

Spiritual qi revival, energy surging, all things evolving, ancient ruins opening, and foreign races arriving...

(This book has no transformation into a human, nor any human clones or the like. If that's not your thing, don't read it, and don't flame me.)