Na-shuul, a violent and dark pony, dabbled too far in to the dark arts of unicorn magic. His punishment for such a transgression was to keep the very things he wished to summon inside of The Inferno. Na-shuul has been kept sealed by the strong runes underneath Canterlot, however these runes are fading, and a servitor of Na-shuul has kidnapped Rainbow Dash. With all others too busy fighting off the dark servitors at Canterlot, Fluttershy must delve in to The Inferno to save Rainbow Dash, and all of Equestria.