The System Is Dark and Boundless

When the protagonist Liu Xing was on the verge of death, he was selected by the Dark Ark left behind by an alien civilization. After activating the system, you become the dark leader who leads the powerful mecha army. Watch how the protagonist Liu Xing wanders among the major forces of mankind, unites vertically and horizontally, and finally gathers the power of Blue Star to defeat the World-Destroying Legion and successfully defend mankind's only home, Blue Star!