During the Forerunner-Flood War, the first known Gravemind came into existence as a centralized intelligence to coordinate Flood efforts against the Forerunners. Eventually Forerunner space navy tactics began to fail. The Forerunners developed the Halo Array as a desperate countermeasure, which would destroy all sentient life in the Galaxy, thus denying the Flood "food" for growth.
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During the Forerunner-Flood War, the first known Gravemind came into existence as a centralized intelligence to coordinate Flood efforts against the Forerunners. Eventually Forerunner space navy tactics began to fail. The Forerunners developed the Halo Array as a desperate countermeasure, which would destroy all sentient life in the Galaxy, thus denying the Flood "food" for growth.
