Alien: Lost Sector

Low-tech interstellar navigation civilization + entry into human high-tech dimensionality reduction + multi-perspective hard science fiction expansion history. In this universe, technology is locked by aviation stones. Countless civilizations can easily span light years, but they are still stuck in the era of wooden ships, muskets, ledgers, slaves, temples and dynasties. Interstellar voyages are like the Great Navigation, star ports are like colonial docks, and the universe is divided between chambers of commerce, empires, smuggling fleets, and the old royal family. The story begins with the escape of an exiled alien prince. He lost his fiefdom, fell into a dark port on the border, and was forced to board a smuggling ship to survive among ledgers, gunpoints, and slave cages. But after a ship-stealing riot, he got a strange metal fragment, which pointed to an isolated island star area where no navigation stone civilization had set foot. It's called the Milky Way. In the Milky Way, there is a civilization that does not have aerospace stones and cannot easily travel across light years, but it has embarked on a completely different technological path: industry, radar, computers, materials science, automatic control, modern aerospace and war systems. When people on Earth first came into contact with the Skystone Universe, they were not faced with higher gods, but with a group of old-era overlords who could cross the star sea but still ruled the stars with muskets and wooden ships. This is a hard science fiction story told from an alien perspective. Humanity will maintain the technological generation gap, understand flight stones, seize shipping routes, hide earth coordinates, build fleets, and eventually conquer the entire observable universe step by step.