A mortal's path to immortality. There is no System, and fighting opponents above your level is difficult. The protagonist's actions are by no means those of a righteous cultivator. If you don't like it, feel free to criticize.
Tianyi, an ordinary mortal from a remote backwater, witnessed a battle between righteous and demonic cultivators in his family's rice paddy when he was six. By a twist of fate, he helped the righteous cultivators defeat the demonic ones and was admitted to Qingyuan Temple. With a dual metal-and-fire spirit root, he became a righteous cultivator of Qingyuan Temple. Though he initially made eliminating demons and defending the Way his life's mission, for various reasons he fell to the demonic path. From then on, he lived by killing for treasure, ganging up on the weak, and betraying others, always with his life on the line.
Tianyi: “Fellow Daoists, I judge people by their deeds, not their intentions. Now that I've fallen to the demonic path, don't blame me for using every dirty trick in the book!”