When the most dangerous unicorn in Equestria, Arcane Shade, makes a daring strike against the capitol city of Canterlot, Princesses Celestia and Luna are forced to turn to the most dangerous mercenary in Equestria, an alicorn by the name of "Thunder Dasher". Armed to the teeth, and granted the authority to operate outside the boundaries of Equestrian law, Thunder Dasher embarks on the most dangerous hunt of his life.