In the Apocalypse, I Prove the Way Through Killing in the Shadows

(System-focused, nearly invincible protagonist, passionate battles, a fusion of multiple settings, decisive and ruthless, self-interested, not a saint, no incest.) When humanity has become walking chunks of meat on this post-apocalyptic continent. When settlements are overrun and children are kept penned up. When his home is destroyed and his family killed, and even his big brother dies at the hands of another race. What will Xu Feng do? “Host deceased. Rescanning. Xu Feng, compatibility: 100%. Selection complete.” “Mission: Kill any living being ×1 (complete)” “System officially activated. May the Host enjoy annihilating (struck out)… saving the world!”