Princess Luna has found herself on a very different moon after some strange force interfered with her banishment. She doesn't know what the metal objects that keep orbiting and sometimes landing there are, but she's going to find out.
It is a century after the war of the two cities, a time when the line between pony and machine is becoming blurred. And yet, even now when ponies are connected in so many ways, something wants to disrupt the fragile network of society.
Luna discovers a vast and ancient being approaching Equus. When she and Celestia go to meet it, they see into the early dawn and eternal twilight of their universe.