Millions of years in the future, the Sun collapsed, and the existence of the human race on Earth was about to end. Yet, the arrival of the Xis, an omnipotent alien race, saved the human from ma.s.s extinction and forced them to live under the surface of the airless, dying planet. Their act wasn 't selfless though. The Xis forced the human race to atone for their sins against the Earth by sending...