438 years ago, ponies discovered the remains of the civilizations that existed before them. This led to a period of increased technological development, spatial expansion, and further discoveries that would forever change ponies as a race. In the present, Celestia's only student has discovered a beacon that recounts the Old Races' war against a nigh unstoppable enemy named the Reapers. Against an enemy with millions of years of experience, the strength to wipe out entire civilizations systematically, and the ability to make organic beings their mind-slaves, it will fall to one mare and her team to protect the galaxy.