Twilight Sparkle is now immortal and very nearly impregnable to damage and injury after becoming a princess. Outliving her friends had always been a worry for her, but now it's a reality that she has to live with. Being mortal, and far too susceptible to injury, Twilight's friends all end up putting Twilight through her worst nightmares. How will the Princess of Friendship cope with losing her friends one after the other?