Princess Twilight has come up with what she believes to be the perfect plan to protect the future from Opaline. She will seal all of Equestria's magic in the Unity Crystals, and all of the dragons' magic in the Dragonstone.
Princess Twilight is sure that the future is hers to protect, and she is certain that this is the only way to do so.
Captain Gallus strongly disagrees on both counts.