Best-selling author Karen Traviss continues to explore the years prior to "Emergence Day." As Marcus Fenix fights what turns out to be the last battle of the Pendulum Wars, his father, Adam, perfects the devastating weapon known as The Hammer of Dawn. Peace is coming to Sera, but neither father nor son is optimistic about its long term prospects.
— Description from Comic Vine community (comicvine.gamespot.com).
