Twilight Sparkle. Her life has become stressful since becoming a princess, and she just can't seem to adjust. When a travelling salespony gives her a book on potions, she finds one which she thinks will make her life better. We all know how this will turn out. Warning: Scenes of murder.

Credit to Dragnmastralex from deviantART for the 'Nightmare Twilight Sparkle' image used for the cover.