Batman and Wonder Woman fought side-by-side to stop Ares, who had created a helmet that greatly amplified his powers. They were able to stop Ares, but at the supposed cost of Wonder Woman's life. Batman put on the helmet to take down Ares, but he lost control and killed the god to avenge his fallen friend. However, Wonder Woman was still alive, and she attempted to remove the helmet from Bruce, but he was so addicted to the power he killed her himself. With unlimited power and no morality, he began a war that would result in countless deaths.