My Little Pony: Friendship is Magic Volume 12;

The craziest, most epic MLP story yet! Multiple versions of ponies are springing up around town and strange new beasts stalk the land as an orb of energy grows larger in the sky. Twilight and the Princesses have no answers… but Discord might in “Accord.” Then, Twilight is startled to find that the most important history books in Equestria are going missing. Will she and her friends be able to uncover the identity of the mysterious new villain responsible in “From The Shadows.” 

Also contains the short story "For The Pony Who Has Everything" by Jeremy Whitley and Jay Fosgitt. Collects issues #48–53.