Waking from a nightmare with no memory of what happened, Apple Bloom is shocked. She has become an Alicorn! To find what has befallen her, she seeks advice of Princess Celestia. But the royal sisters have vanished, unfurling a real nightmare!
Twilight has a new book about the history of the noble houses of Equestria. But the history of one of these houses is quite different from the official history of Equestria…