This library is undoubtedly very useful for Chen Guan; the Secret Spirits recorded inside are a huge fortune.
Moreover, many of these Secret Spirits are dominant figures, like the Evil Luo King recorded inside, and the Tearless Asura, with detailed information about the regions they inhabit.
Regrettably, the information on the Evil Luo King is detailed enough, but the Tearless Asura's information is not as comprehensive. The Secret Law is recorded, but only one of the three Hidden Powers is noted.
There's also a record of the Celestial Destiny Secret Treasure of the Tearless Asura, but its effects are not described thoroughly.
It can be seen that there are many blank areas in the Tearless Asura's information, probably waiting for future additions.
"This is good enough," said Chen Guan, not planning to kill the Tearless Asura.
