Continuation of Dusk and Dawn.
The Dawn Militia and Nightmare Moon's armies continue to wage war across Equestria under the eternal night. The six bearers of the Elements of Harmony–Fluttershy, Rainbow Dash, Applejack, Rarity, Pinkie Pie, and Trixie–have been blessed with extraordinary powers, with which they lead the Dawn against the tyrant and her reluctant lieutenant, Eclipse.
But it's hardly easy. After all, what place does harmony have on the battlefield?