An unwilling traveler of time and space, Twilight Sparkle becomes face-to-face with herself in a torn and dying Equestria forged from magecraft and industry, and haunted by the spectre of Discord's thousand-year reign.
The birth of Discord, the rise of Nightmare Moon, and the death of the alicorns, from the eyes of one who saw them coming, and could do nothing to stop it. This is the story of Phobos, the 12th seer - and it is a story he wrote himself.
Trixie has taken over Ponyville and sealed the town in a giant forcefield. It's up to the Royal Guard to stop her, but this may not be as easy as it seems.
As Twilight prepares the next Summer Sun Celebration in Ponyville, she is not only suddenly faced with the reappearance of Trixie, but also a dark part of Equestria's history - and Celestia's.