The Halo Array is a series of massive ring-like structures created by the ancient race known as the Forerunners in the Halo video game series. These rings are designed as a weapon to combat the parasitic species called the Flood. When activated, the Halo Array can destroy all sentient life in the galaxy, effectively starving the Flood of potential hosts. Each ring in the Halo Array is capable of supporting life and features diverse ecosystems. The Array is a central element in the lore of the Halo universe, representing both a powerful tool and a significant moral dilemma regarding the preservation of life versus the need for survival against the Flood.