Septerra Core

This is actually a world for a fanfic sequel to the game Septerra Core. 30 years after the game ends, a new generation of heroes journey to other worlds formed by the Creator.   Among other things, they'll encounter a world that is hollow and filled with ancient machinery, a world where the people live in small sky-cities because the surface is too toxic, and a world where night occurs but once every million years.   Each of these worlds has gone through a crisis, and our heroes will learn of these crisis, and explore and learn about the people who live in them.