Twilight (novel series)
One day, Jacob, Renesmee, and Bella go to hunt in the forest. They see Irina, from the Denali coven. Irina came to make peace with the Cullen family for not fighting with them against Victoria. However, Irina sees Renesmee and thinks she is an "immortal child", a child who was turned into a vampire. These children are against the Volturi's laws, so Irina goes to tell the Volturi. Alice sees the Volturi coming to fight and she leaves because she knows that Aro, one of the Volturi, wants her more than anything. The Cullens spread out to find any vampires that could witness that Renesmee is not an immortal child and that she grows everyday. Bella asks Edward to teach her how to fight. In this process she learns that her superpower is being a shield. This means that she can protect others from other vampire powers.