Zhang Tie turned around and left right away right because there were 8 pearls of secret items in the cluster of metallic crystals.
It would take one about 2 days to open a pearl of the secret item; however, they could only stay here 3 days at most. That was to say, except for Zhang Anguo, the other 8 knights of Tianlu Palace had to make their full efforts in 3 days, 1 for each pearl of the secret item so as to ensure that Tianlu Palace could get the silver secret item in the end.
Tianlu Palace organized 9 knights to explore the hieron ruins not only for one silver secret item.
