At the end of the book, Volturi (Sheen, Dakota,etc) who are,like, vampire government and police, come to Forks from Italy to judge and likely kill Renesmee. Because they believe she is so-called immortal child, a turned child who naturally won`t grow but due to being immature would be too instinct-driven and kill too many people thus proving to the world vampires exist. And Volturi want to keep that a secret. So, anyway, Cullen Clan gathers vamps form other countries to testify that the demon fetus who broke her mom`s spine while kicking in her womb is totally harmless to humans and vamps alike. Cause she`s half-human half-vamp and will grow to maturity so no fear of hungry kid`s tantrums.Anyway, all vamps have some super power like poor man`s superheroes. So Bella can create a shield like Sue Storn, Edward can read minds like Professor X, there`s Electro Girl,etc. But what happens when Volturi army appear is that they all talk this one out, Volturi are convinced, kill some vamp chick Irina for lying that spine-breaking fetus is dangerous, and leave in peace. No fight.In the movie, they have vamp Alice who can show you future when she touches you touch Volturi leader Aro so carnage that follows is really just her vision of the future if they fought. Vision stops when Bella decapitaes Aro with her Bella Fu who wakes up from the trance and decides that spine-breaking fetus who looks like Marlon Wayans in Little Man isn`t a treat to anyone and takes his army back home to Itlay. Everyone lives happily ever after.