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The titular ringworlds


The Halos, alternatively known as the Sacred Rings by the Covenant or Fortress Worlds by their creators, or installations by the AI that run them, are seven massive ring-shaped installations constructed by the Forerunner throughout the galaxy one hundred thousand years ago as a last resort when combating the parasite known as the Flood. When nothing else could be done, they activated the rings which killed all sentient life within three radii of the galactic center. The Halos are all research facilities and weapons of mass destruction...