One day in the Crystal Empire, Shining Armor and Princess Cadence are alerted to a gigantic blaze spreading over the outskirts of the city. Cadence attempts to hold up a shield before the fire from killing her subjects, but when she does, the smoke manifests into an alicorn even larger than Celestia herself. They send a distress letter to Canterlot and Celestia calls upon the Mane 6 to help vanquish this new foe. But how can they defeat a foe strong enough to burn the world to a crisp?