The Pillar of Autumn is a fictional spaceship from the video game series Halo, developed by Bungie. It serves as a key vessel in the Human-Covenant War, primarily transporting the protagonist, Master Chief, and his AI companion, Cortana. The ship is known for its advanced technology and significant role in the battles against the alien alliance known as the Covenant. Launched in the 26th century, the Pillar of Autumn is equipped with powerful weapons and defensive systems. Its design reflects the military capabilities of the United Nations Space Command (UNSC). The ship's journey begins in the first game, Halo: Combat Evolved, where it becomes central to the storyline and the fight for humanity's survival.