True Demon!

What defines an immortal? What defines a demon? When a transmigrated soul awakens in a brutal world of cultivation, he brings with him an idle cultivation system—a passive, ever-growing cheat that lets him advance even without conscious effort. Armed with this power, he vows to carve a path of unbridled freedom through a realm where both immortals and demons prey on the weak. Ruthless in his decisions and swift in his vengeance, he walks the demonic way without hesitation, settling every score with finality. This is a standalone, complete story that shares thematic ties with the author's previous work, yet requires no prior knowledge for new readers to dive straight into the carnage.