On the night of the eclipse, Twilight learns that she wasn't the first to ascend to alicornhood. She wasn't close to the first. These others had made mistakes. Huge mistakes. And all of them involving Nightmare Moon. Some of the others hadn't been able to fully control their powers, some where imprisoned by Nightmare Moon, and one other self-exiled himself. Join Twilight and her friends as they try to help these alicorns and stop an coming apocalypse brought on by an accident so large and coincidental, it had to have been planned in years in advance.