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Genesis is a Forerunner Builder facility constructed to act as a connection between the digital world of the Forerunner Domain and our physical realm. It is monitored by 031 Exuberant Witness.
Following the destruction of Mantle's Approach, Cortana was pulled through slipspace and stranded on Genesis. It was here that she encountered the Warden Eternal, a Forerunner ancilla who believed she and the other "Created" were the rightful Reclaimers of the Mantle of Responsibility. She began activating Guardians, ancient Forerunner machines designed to keep unruly worlds and species in line, which she transported to Genesis in preparation to bring all sentient species under her control.