The evolved golden slime uses humanity.

Once upon a time, the golden slime was overhunted by greedy humans and was on the verge of extinction. Under such harsh conditions, one slime created a magic circuit within its body. Its descendants evolved the magic circuit into intelligence. The golden slimes, which gained the power to survive from magic and intelligence, increased in number and avoided the danger of extinction. After winning repeated battles with humanity and securing the right to survive, humanity began to decline due to its greed. So the golden slimes began to use humans as useful tools. This was the moment when the liquid metal magic mechanical life form became the ruler of this planet. ...Nanchatte?