In the real world, in addition to technology, there is also energy that restricts our journey to the stars and sea. If humans do not master next-generation energy technologies such as controllable nuclear fusion before all fossil fuels are consumed, human science and technology, industry and other industries will not be able to maintain their current scale and level, let alone explore the starry sky above our heads.
So is the world of fantasy.
Humanity has never given up exploring the unknown world for a moment, and the development of teleportation technology has greatly accelerated this process.
However, exploration is not free. Compared to other types of magic, teleportation consumes a particularly large amount of energy. Before the existing energy sources are exhausted, either new energy sources or new worlds must be discovered. Otherwise, human beings who have lost their energy will not be able to support the current level of civilization, and will only continue to decline and regress. By then, there will only be a small number of humans left living in eternal darkness, maintaining the minimum existence, let alone exploring other worlds. Until destruction, humanity will be imprisoned in the known world.
No matter how hard we try, the bell of energy exhaustion still rings. Will civilization continue, or will it be destroyed? So, it's just a story about survival.