The United Nations Space Command (UNSC) finds itself in the final phase of a long, desperate struggle against the Covenant armada. This brutal conflict, which began on February 11, 2525, is hurtling towards its climax. On August 30, 2552, the Fortress World of Reach fell, plunging humanity into even deeper desperation.

Years after the incident of New Phoenix, John as a captain of UNSC Aide-De-Campe was sent to a Forerunner Shield to investigate the frequent disappearance of UNSC ships, unaware of how their lives are going to change...

After the end of the great war, things become more tolerable for the belligerents and willful survivors of the Human-Covenant war as the new generation has looked forward to joint peace, prosperity and technological advancement. During these times, an Infinity-class ship is sent to investigate a Forerunner artifact, a now commonly increasing sight, and is sent to a trip unprepared.

Whether it be misfortune or an uncompromisable force, the Arbiter crash landed on Earth. However, it is not the same Earth he Glassed to get rid of parasites. This Earth is instead decimated by war between two factions, Human and ANOTHER Hive Mind species bent on destroying the world. This time however, the Arbiter is less than welcome to join the Humans.