It is near the end of the 21st century. For years now, the Human Liberation Front had been battling the alien forces of Equestria, striving to drive them back from whence they came, if not outright destroy them. Finally, in their last hour of greatness, they managed to break through the barrier of Equestria...only to find out that beyond it was a massive wave of alien magics. Humanity had bit the hand that could have fed them, and thus paid the price of near extinction. But, beneath the surface, protected from the thaumatic blast waves, there lived survivors, both Human and Equine, while the native Equestrians worked to make the Earth livable again.

200 years later, the survivors emerge from their tombs, only to find their world has taken rather significant change...

(Inspired by Deadlands: The Weird West, and Rifts. Expect Western Wizardry.)