Set decades before the events of the main Halo saga, Halo Wars: Definitive Edition follows the crew of the UNSC warship Spirit of Fire as they battle the relentless Covenant across the distant planet Harvest and beyond. Led by Captain James Cutter, Professor Ellen Anders, and Sergeant John Forge, the crew uncovers an ancient Forerunner installation that could shift the balance of the war. As the Covenant's ambitious leader, Arbiter Ripa 'Moramee, serves the Prophet of Regret in a desperate search for powerful relics, the conflict escalates into a race to prevent a catastrophic awakening. Facing overwhelming odds, the Spirit of Fire's soldiers, Spartans, and vehicles fight through massive battles to stop the Covenant from exploiting Forerunner technology. Their courage, sacrifice, and determination shape a forgotten but vital chapter in humanity's struggle for survival against an unstoppable enemy.