What's the use of the fragments of ancient books in The Legend of mir?

Fragments of ancient books are props of the sutra depository. The game characters are in the room of the sutra depository. You need to roll the dice with fragments of ancient books. According to the number of dice, you can enter the room below. When you arrive at Room 40 and complete the test, you can get a skill book of Level 47.

The sutra depository is marked in red with the checkpoints with special rewards for customs clearance, and the system will announce the scarlet letter after winning the rewards. Through observation, it is found that the later the room is, the higher the probability of sending good things, and the smaller the room is, the lower the probability of sending good things.

At present, the customs clearance reward items found are: (basically, the more difficult it is to get the items at the back, the more difficult it is to get the Wuping reward at the back of the front room)? Exquisite materials, 3 million experience, Red Moon jewelry, magic dragon jewelry treasure map, magic dragon jewelry, enhanced magic dragon jewelry, crazy war imprisonment, Tai Chi imprisonment, mixed life imprisonment, dragon teeth, fans, God of War, true soul, holy ghost, legend imprisonment, oath imprisonment and prophecy imprisonment.

In addition, the best prizes in Room 40 include Star King, Phoenix Tianyi, Blessing Cake, Platinum Points, 3 small pieces, Fury/Dragon Tooth/Fan, Legend Imprisonment, Oath Imprisonment and Prediction Imprisonment.