Earth grew more prosperous by the day.
Humanity returned to the surface. The Underground Cities came to be known as the "Old Districts," while the surface became the "New Districts."
Only those who had lived before the Apocalypse had ever seen the true old districts of the surface.
Although there was still no sunlight, thanks to technological advancements, one Artificial Little Sun after another lit up city after city.
Vegetation on the surface increased, the oxygen grew richer, and humans even mastered numerous methods of regulating the climate and weather. The surface was becoming more and more habitable.
Thanks to progress in materials science, new Stellar Mother Ships and fighters built with pure technology, not reliant on the carapaces of Exotic Beasts, became increasingly common.
