With the Blood of Demons, I Become Invincible Under Heaven

[Ruthless + demons + steamrolling + immortality + power fantasy] Demons run rampant, and men's hearts are as wicked as ghosts. The only way to stop killing is to kill. An SSS-ranked fugitive wanted worldwide transmigrates to a world ravaged by demons and becomes a village hunter. Fortunately, slaying demons lets him plunder their lifespan, which he can expend to refine and improve his martial arts. From the start, a weasel spirit asks him, “Do I look like a human or a god to you?” “You look like a dead dog to me!” Luo Li nocks an arrow and shoots the weasel right between the eyes, blowing its head apart. Then a mountain tiger descends, radiating a terrifying pressure and devouring countless people. “So you eat people? Why not try a taste of me?” Luo Li deliberately offers his arm. The tiger bites down, shattering its own fangs, and is then skinned and dismembered. Years later, the Nine-Headed Demon King tells his underlings, “Go capture Luo Li, the supreme one of the Nine Heavens, who holds the Ten Lands in check, is peerless across the world, and is known as the True Lord of Slaughter!” The little demon: “Huh... me?” The next instant, a flash of blood-red light streaks across the sky. The Demon King's nine heads hit the ground, leaving only the little demon trembling in fear. Luo Li: “I'm already invincible in this world. It's as lonely as snow.” But then a mysterious voice comes from beyond the heavens: “Are you the Martial Ancestor of this world?” “Then let me see what this so-called invincibility of yours amounts to!” “Die!”