After a horrible dream with warning from a foe long defeated, Discord, Twilight Sparkle and her five pony friends face one of their greatest struggles yet. When a mysterious yet powerful dragon proves his strength against her friends, Twilight seeks Zecora's wisdom for answers about both matters. However, things take a dark turn when Twilight finds an old book about an ancient power thought to be lost, The Elements of Magic. With such power Twilight could beat the beast, but at the sacrifice of her friendship with the other ponies. Taking on the burden herself, the pony slowly begins to be corrupted with her own powers. When the Elements of Magic take on the form of shadow ponies and a plot of chaos thousand of years old is set into motion, hope and salvation's only chance may lie in a forsaken power, magic of friendship.