Three ponies living in the Equestrian Wasteland are thrust into the role of heroes when they undertake a trip into the dungeons beneath an ancient castle and in so doing, become the only people with the potential to fulfill a prophecy. A prophecy which has no idea if they will survive, or even repel the great evil whose return it foretells. A great evil sealed deep beneath the earth long before Celestia herself was born. A great evil that could not be slain by a race of unicorns.

Stopping such a thing is far too much to ask of a slave with half a brain, a soldier who is lost outside of a battlefield, and a changeling who wants to know what befell her people. Yet, there is no one else to ask...