Over a thousand years ago, a great Evil came to Equis. Only with the help of an off worlder was the evil repelled. He was called Razgriz and he was a Demon Lord, a creature half Archangel and half Legion Demon tasked with keeping the peace on planet earth. With his assistance of the Celestial sisters, he fought back the great evil. But it came at the cost of his life, or so the sisters thought.

Now the great evil has returned to Equestria. It threatens all the lands on the planet, and not even the Elements of Harmony can stop him. Seeing the plight of the Equestrians, the Demon Lord Council sends Razgriz back to Equestria to help fight the enemy and stop him once and for all.
But Razgriz's home coming will be anything but joyous. He will not only have to contend with the past events of his supposed death, but the heartbreak, terror, and secrecy that came after it. Live's will be tested, friendships and families brought to the brink of disaster. the future of two worlds is at Stake. And all important, lying underneath, is the return of a great evil.