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The Intergalactic Stage is the fourth and final known stage of a Flood outbreak. This stage is reached once the Flood has consumed all sentient life in an entire galaxy and gained complete understanding of any technological and scientific knowledge that was present. By this time, it has reached a complete critical mass, which means it must depart to other galaxies for further reproduction, infestations and new technologies. By then, the Flood can be nearly unstoppable. The Flood has almost reached this stage once at the end of the Forerunner-Flood war, but was stopped by the activation of the Halo Array.