I recommend the two novels,"Upgrade by Black Technology" and "Picking Up a Technology City", to you. "Upgrade by Black Technology" told the story of a person who brought the technology of a god-level civilization to a fantasy world. There were exciting scenes such as railguns firing magic treasures and mechas killing spirit beasts. "Picking Up a Technology City" told the story of a man who accidentally picked up a space technology city and how he recovered the city and developed technology. It was a story of a counterattack in life. I hope you like this fairy's recommendation. Muah ~π