Lu Ban's Secret Art.

During the reign of Emperor Renzong of the Northern Song Dynasty, there was a water monster on the banks of the Bianhe River. The Kaifeng government was instructed to send its saber-bearing guard Zhan Zhao to pursue the clues. They deduce that the beast is made of a machine and, with Deng's introduction, they go to the Qiankun Palace, the residence of the most famous machine master, Sheng Luban