MLP/Radiant Historia Crossover

"The Chronicle tells of history, engraved by man into the memories of the stars above.
The Chronicle searches these engraved histories for a pen that will rewrite them.
It falls to thee to become time's master and carve a path to the future…"

An ancient empire fallen from desertification, the land is slowly encroaching in sand upon the continent of Equestria. As two empires fight for what little land is left, one soldier is tasked an important mission that will affect the war and may save the continent from certain destruction….. Her name is Twilight Sparkle