In the story of EquestriaBound, Apple Bloom and 3 other ponies must stop a cosmic force that threatens not just Equestria, but the Universe itself.

Yikes! What's happening to Equestria?! Pets and wild animals are attacking ponies, ponies are being corrupted, and the clouds are moving on their own! Also, the Princesses of Equestria and the wielders of the Elements of Harmony have gone missing!

A prophecy states that 4 young children will get to the bottom of this. One of those children is Apple Bloom

In an adventure through Equestria, Apple Bloom and her friends must use a gem that was found thousands light years from Equestria to record 7 melodies, defeat the evil force that threatens the Universe, and unite the elements to save the actual wielders!