A new unicorn known as Siren and her right hand man Zartanis have entered Equestria with a plan to have the entire kingdom fall to Disharmony. Siren plans to enlist the help of villains to complete her ultimate goal. Twilight and her friends must find a way to defeat Siren but it will not be so easy. Their journey will test their friendships and ultimately decide if Equestria can be save from Disharmony.