War has come to Equestria. Changling hordes have wiped several major cities off the map in one night of bloodshed and destruction, and are now marching towards the total destruction of Equestria itself; on their own they were powerful, but somehow they have also enlisted legions of the most dangerous monsters in the world to fight at their side.
The townsfolk all fight valiantly, but against such odds they can only lose ground to the ever growing enemy; to make matters worse, the elements of harmony are scattered throughout the land and cut off from each other. With both princesses injured in the opening battles, the call goes out for all able bodied stallions to join the military and defend their homes or perish like those before them.

An archeologist finds himself pulled into a parallel world by Discord's storm of Chaos, and encounters the mysterious creatures that live there. How will a rational human, confronted by creatures out of mythology, and unable to find his way home, adapt to his environment? Only one way to find out.

There is a flood on the horizon. Equestria's enemies have united, and the coming tide will not only change the course of history on one world, but two, and bring about a monumental meeting that will bring brothers and sisters from those two worlds together.

At long last, the downtrodden will rise.

The battle begins.