With an unlimited death-seeking System, all he has to do is court death to grow stronger.
System: Go ahead, do whatever you want. If you manage to die, I'll admit defeat!
Ghost King: "Oh? A lone human. Let me... Holy crap, the Buddha's Radiance of Deliverance! Are you seriously playing dirty?"
Nine-Headed Demon Dragon: "You tiny insect, kneel at my feet... Don't tear it! These are dragon wings, not chicken wings. They won't taste good roasted."
Flying Zombie: "Become one of us... Damn it, my teeth!"
Li Bai: "My motto in life is: if it won't get me killed, I'll do it until it does!"
This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.