C231 Sky Craftsman I

"However, the Fan Zhuzi did not give up because of this and forged another four mechanism tools. The four mechanism tools were made using the Four Illusionary Beast as the model, but after it was completed, the Fan Zhuzi would die of old age and no one would know the whereabouts of the other four mechanism tools."

One mechanism could take down an entire city. In that chaotic era