Mythological story The mirror or whatever the treasure that can charm the mind, what is it called ah?

The treasure of the Nine Quarters of the Yellow River Formation is the Mixed Golden Dipper, which serves to cut down on one's cultivation, and I don't know much about the treasure that mesmerizes the mind. Mirror class treasure is more famous on the Kunlun mirror (shuttle time and space), yin and yang mirror (shine on the human body can determine the life and death, there are yin and yang two sides, yin side for white, yang side for red, white a shake is the road to death, red a shake is the door of life)