When Rainbow Dash unleashed the first Sonic Rainboom she created a magical connection between the Mane Six, starting them on the path that would lead them to defeating the most dangerous evil villains Equestria has ever faced as well as mastering the magic of the Elements of Harmony. However creatures loyal to those defeated by the Twilight and her friends travel back in time to change the past, all of time since rewrites itself. Will Twilight be able to reunite with her friends? And if she is, how will they be changed in this world of shadows, this world of madness, this Nightmare Equestria.