Things change, and change quickly. Friendships fade with time, old bonds grow weak as new ones overcome them.

The Changlings had been the last straw. When Shining Armor had pushed the Changlings back, he had thrown one into the mountains, where it had wandered for days, before accidentally pressing the last switch that held the magic bonds in place. A new enemy is rising, quickly, and must be put down before any pony will know peace.

But behind a screen of magic, another sinister force rises, and seeks to strike from within…