Halo rings are massive, ring-shaped structures found in the Halo video game series created by Bungie. These rings are designed as superweapons capable of destroying all sentient life in the galaxy to prevent the spread of the parasitic Flood. Each ring is a self-sustaining ecosystem, featuring landscapes, flora, and fauna. In the lore of the series, the Forerunners, an ancient alien race, constructed the Halo rings as part of their efforts to combat the Flood. There are several Halo rings, each with unique characteristics and histories, playing a central role in the overarching narrative of the games.