Before Luna became nightmare moon, before Discord took control, and long before the three pony tribes became one… there were the Voices of all. Creatures that were able to see and manipulate the magic of life around them.
They used their power to heal the sick and dying, to aid those they deemed pure of heart and teach others to be in tune with magic.
But they were corrupted by their own doing. They wounded their world, and were expunged from it by the gods of old as it was torn asunder.
Now, many thousands of years later, they've returned, and it's up to Twilight and her friends to stop them from destroying Equestria in the name of vengeance.