After her return, Luna's efforts to restore the branches of the military yielded a brand new Fleet. And with no time to spare, as Saddle Arabia calls upon her ally to quell a particularly vicious period of Griffon raiding.

All does not go according to plan.

With old evils awakened, and the Guard back on their heels, the princesses hope to make a final stand at Canterlot.

The millennium of peace has been shattered, and with black madness consuming Equestria, will anypony live to see tomorrow?