What would you do if you had just one last day to live? If the world was about to end, and you knew exactly when? Thanks to a dark god and a dangerous game he wants to play, all of Equestria - all of Equis - will soon find out. The stakes? Somepony must solve his riddle or the entire planet and everything on it ceases to exist. Some ponies rush to solve his riddle, some lament their coming deaths, while others just enjoy the time they have left on what might just be their one last day.