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A look at the seven ringworld weapons collectively known as the Halo Array.
In their efforts to contain the Flood parasite one hundred thousand years ago, a race referred to as the Forerunners built a network of seven ringworlds they called "Halo." This array of constructs was not simply for occupation and research, it was a large-scale weapon, which, when fired synchronously, had enough power to eliminate all sentient life in the galaxy.
