Same universe as my story, The Sandstorm King.
Harmony reigned not only in Equestria, but across the sea and in most countries. Certainly, skirmishes, disagreements, and short wars happened, but they were far from Equestria and her creatures. Now, though, one political move causes a collapse of all peacefulness, and all the alliances made across many countries come to defend and attack each other. Nobeast can stop it, and it's the perfect breeding ground to awaken an ancient, all-consuming threat. Is Love or Friendship still powerful? How can Harmony save this one? Who will be left alive in the end?