From the introduction: Welcome to the Great Thousand Worlds. Contrary to its name, this is a singular massive world, though it overlooks countless Lower Planes. Countless different clans, sects, and races live throughout this vast land. If you have visited the worlds of Battle Through The Heavens or Wu Dong Qian Kun, you may recognise this world as the place that the respective 'main characters' of those worlds ascended to when they reached the peak of their Lower Planes. Indeed it has been several hundred years since they did so, each establishing themselves as a peak faction in the Great Thousand Worlds. However this is not their tale.