Galaxy Mage: but the Sci-Fi Universe

Human society has entered the interstellar era due to the discovery of [Cornerstone Element], and great exploration fleets have turned hundreds of planets into beautiful colonies. As a result, human civilization has become unprecedentedly prosperous, leaving countless distinctive footprints among the stars. But this is not enough for the vast expanse of the Milky Way, and the aliens lurking in the deep space of the universe are also malicious. Until on a planet that had just been occupied by humans, a time traveler rubbed out a spark with his bare hands.