The Sacrificial Altar!

The sight affirmed what Wang Baole had guessed previously, but seeing it with his own eyes still shook him to the core. He couldn't help but gulp.

The millstone was enormous. It consisted of two plates, the lower piece unmoving while the upper piece was connected to nine handles and continuously rotated and ground against the lower plate. The grinding made a loud rumbling. It seemed as if nothing could escape being crushed if it fell between the two plates. Wang Baole recalled both towering beasts he had seen while on this world. He concluded, without much difficulty, that there must be some sort of power in this world that was compelling nine towering dead beasts into pulling the millstone's nine enormous handles. The beasts were forced into running around in circles in order to keep the millstone turning!