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In the aftermath of the Fall of Reach, the fleeing UNSC cruiser Pillar of Autumn stumbled upon a mysterious ring world that would be known as Halo. As fighting erupted between UNSC and Covenant forces across its surface, elements of the UNSC forces would discover shocking secrets about Halo that would change the course of the war with the Covenant…and a horrible threat to all sentient life throughout the galaxy.
