Luna of the Moon and Celestia of the Sun are making preparations as they continue to fight during the Great Equestrian War. There are mysterious weapons being used by enemy factions that threaten the very existence of equines and all other sentient creatures. The two sisters have a plan in mind that require the assistance of a young unicorn that they see potential inside. Chains will be put through many years of training under Starswirl the Bearded to harness his abilities. His training would be near completion until one day when a raid on the Castle of the Two sisters changed everything.