Hi , it's about a novel who i read a long time ago , monsters appear in the world (a giant white snake in the first chapters) , the mc is a guy who get a technique via a cow who speak . The mc eats the animals who try to kill him. This novel was on webnovel. sorry for my bad englisg
I would’ve said Desolate Era but the snake was green and those last couple of lines made me think otherwise..