Princess Luna's Lunar Stallions are an elite guard force of seventy, the descendants of the originals from a thousand years ago. Her lover leads them, and they've begun to flourish and be accepted by society. But now there's a new super-power in Canterlot, and she's killing the criminal ponies she catches rather than arresting them. The descendant of Luna's avatar of WAR has emerged. Her ancestor was the one mare to ever go into battle with the Lunar Stallions, the Moon Champion. Can the Lunar Stallions stop this killing machine? Who is she?