Meanwhile, the Volturi, a powerful vampire coven, becomes aware of the Cullens' existence and the birth of the half-human, half-vampire child. They mistakenly believe that the Cullens have created an "immortal child," which is against the law of the vampire world.
As Aro, leader of the Volturi, Sheen gets only a brief scene—but he chews it with operatic glee, setting up the conflict for Part 2. It’s a welcome jolt of energy. twilight saga breaking dawn part 1