Killing Strange Things, My Skills Can Be Deduced Infinitely

In the last years of the dynasty, wars broke out, demons were raging, and strange things arose... Li Feng obtained a system that allowed him to deduce martial arts by consuming his lifespan, and by killing monsters and weirdos, he could gain his lifespan. So when he crossed the mountain of corpses and the sea of ​​blood, stepped on all the bones, and stopped to look back, he realized that he was invincible in the world!