While taking his anger out on the Flaming Foundry, the Demon Bull King discovers Lady Bone Demon's tomb.
While Princess Iron Fan denied Red Son's idea about winning the Great Wall Race to get an Immortal Peach, she pointed at Lady Bone Demon's tomb, as she was telling Red Son that she and the Demon Bull King were busy uncovering the tomb.
After some time, the Bull Clones were able to uncover the tomb, but neither them nor the Demon Bull Family were able to open it, as none of them has the power to open it. However, after Princess Iron Fan and Red Son were able to retrieve the Skeleton Key, the Demon Bull King was able to open the tomb.
In Monkie Kid