Introduction to the Blue Bull Stone: The Blue Bull Stone is located next to the Juxian Pavilion. It is named because the stone looks like a cow. According to legend, this green ox was originally the mount of Taishang Laojun. When he left Hangu Pass in the west, he put the ox in Lu Mountain, thinking of picking it up later. Because Taishang Laojun was afraid that the green bull would cause trouble after he left, he took away the two horns of the green bull before leaving. Therefore, the green bull stone had all four limbs, but only the horns were missing.