I Became a God of War by Screwing on the Assembly Line?

Imaginary world [non-shuangwen] + [multiple worlds] + [no heroine] + [harem] + [magic] + [technology] + [immortal cultivation] + [superpower] + [beast control] + [brain burning] + [strategy] + [devour] + [evolution] + [power abilities and systems in all books] Bai Gong, as the protagonist of the completed book, entered a world that was forgotten like him. In the future, he began to set out in the present world, and while gradually solving the mystery, he learned the truth about the area. Immortal cultivators can be seen everywhere, strangers everywhere, and even the sky is made up of countless worlds in countless books. How to choose a power system?