Savage System: I'm A Big Villain

A mysterious beam of light attacked the Scarlet Moon Lake in Jizhou. It caused an infant to mutate into a deformed child. After being locked up in the basement for 20 years, he acquired a Savage System by accident. 
Possessing the ability to repair himself, he became immortal and indestructible. Killing a person was a crime, killing ten people was a legend. Then what about killing ten thousand people? Savage Meng Duo descended upon the Scarlet Moon Lake. He started a massacre party one after another.