Ye Chen looked at the mark on Shangguan Xueyan's hand.
At this moment, Shangguan Xueyan looked at Ye Chen and asked, "Master, can such a mark really be falsified?"
Ye Chen said indifferently, "This mark is carved into the depths of the soul through a kind of charm, like a shackle.
"If I'm not wrong, this mark will react in a special way whenever it encounters special true Qi."
At that moment, Shangguan Xueyan immediately said, "Master is right. This kind of mark is indeed so. There is a Heavenly Demon Stone at the entrance of the Moon Sky City and the Heavenly Demon City.
"When the people of our Heavenly Demon Sect place their hands on the stone, the Heavenly Demon Tokens and the Heavenly Demon Stone on our bodies will emit red light.
"Then, we can enter the Heavenly Demon City.
"However, if there isn't any light or if the color of the light isn't right, we will be completely killed."
Ye Chen nodded.