When an ancient Empire returns, Princess Cadence, Shining Armour and the girls are sent over to investigate further, but, when they discover that not only the Empire returns, Cadence must use her magic to conjure a spell only she can craft to protect the Empire from destruction, whilst trying to destroy the evil that stirs around them. With Cadence fading fast, and Shining Armour by her side, trying to help her, she is unable to help defeat the evil, and Twilight and her friends are once again responsible for trying saving Equestria....but, can they do it without the elements of harmony?