Relics of Civilization: I Put God-Level Civilization into My Body

In 2168, human beings opened a space-time door on the back side of the moon leading to an extinct civilization. Others enter the ruins of civilization and grab mechas, spaceships, and technology. F-level maintenance engineer Lu Ran can see the last powers left behind by each civilization before its demise, and fuse them into his own body. Gravity civilization becomes his bones. Phase civilization becomes his skin. Fusion civilization becomes his blood. Stellar civilization becomes his heart. Time civilization becomes his eyes. The black hole civilization becomes his stomach.