Crisis of Infinite Equestrias

Crisis of Infinite Equestrias is a book that was located in the forbidden Dark Magic wing of the Royal Library of Canterlot. It was among the books read by Sunset Shimmer in her quest to prove to Princess Celestia that she was ready to learn the secrets of the Magic Mirror.

The book most likely told of an event that effected infinite realities, or infinite "Equestria's".

Behind the scenes
The name of the book is a play on the title "Crisis on Infinite Earths", a groundbreaking and iconic storyline published by DC Comics.

Appearances

 * "The Fall of Sunset Shimmer"