There are Seven Destructive Friendship Sins that can tear apart any friendship, no matter how dedicated or how strong the bond is. Princess Celestia predicts an end to Equestria and all of the world if these sins should take over the motives of the main six. Every old foe will rise and a biblical apocalypse will destroy everything, if they do not get to the very bone of their friendship, and find out what has endangered it. As Twilight Sparkle works to keep everything under control in the coming disharmony, will she and her friends become what they tried to stop?