The Chief examines the dead bodies of the ODSTs, and the Praetor realizes that the Humans are headed for the Codex. Lykurgus learns the function of the Codex: to activate the Halos and destroy all sentient life in the galaxy. Realizing the incredible danger that the Codex represents, the Humans decide to destroy it. At the same time, the Praetor and his troops prepare to defend it to the last man. The stage is set for the final battle for the future of the Codex.