In just one breath, Liu Bo and the other two reappeared in a vast underground space.

What shocked Liu Bo the most was the strong spiritual energy of heaven and earth in this space. He felt that with every breath, the true energy increased slightly, and the concentration of spiritual energy here was dozens of times that of the outside world.

"Grandpa, why is the spiritual energy here so strong? It should be dozens of times that outside!" Liu Yan asked in surprise.

"This is the biggest secret of our Liu Mansion. You must keep the secret here. Don't tell anyone about everything here outside, otherwise it will cause a disaster to our Liu Mansion." Liu Tianxiong warned with a serious face.

"Grandpa, I will keep it secret!"

"Don't worry, grandpa! I will keep my mouth shut when I go outside." Liu Bo and Liu Yan hurriedly promised.

"The underground here is a fifth-grade spiritual vein, with spiritual energy more than fifty times that outside. The ancestor settled at the foot of Daliang Mountain because he discovered this spiritual vein. The spiritual energy here is too strong. Generally, only when the spiritual lake stage can you go to retreat here for a long time. You can also come to the Concentration Period when breaking through the small bottleneck. You cannot practice here during the Qi training period. On the one hand, it is for the sake of confidentiality, and on the other hand, it is because of the speed of absorbing spiritual energy, and the realm of Qi training period is too fast, so it is difficult to control, so it is inevitable that you will become possessed by the devil." Liu Tianxiong told.

"Grandpa, are the fifth-grade spiritual veins very high? How are the spiritual veins graded?" Liu Bo asked curiously.

"The fifth-grade spiritual vein is already very high. Such a level of spiritual vein can produce top-grade spirit stones. It can occupy a fifth-grade spiritual vein, which can be regarded as a third-rate force in the entire Great Jin State. Although our Liu Mansion occupies such a spiritual vein, it is still far from the third-rate forces of the Great Jin State, so this matter must not be exposed, otherwise it will be a huge disaster. The level of spiritual vein is divided into nine grades from low to high. The first and second-grade spiritual vein can produce lower-grade spirit stones, the third-grade spiritual vein can produce middle-grade spirit stones, the fourth-grade spiritual vein can produce top-grade spirit stones, the fifth-grade spiritual vein can produce top-grade spirit stones, the sixth-grade spiritual vein can produce lower-grade spirit crystals, the seventh-grade spiritual vein can produce middle-grade spirit crystals, the eighth-grade spiritual vein can produce top-grade spirit crystals, and the ninth-grade spiritual vein can produce top-grade spirit crystals." Liu Tianxiong explained.

"Grandpa, I have only heard of spirit stones. What is spirit crystal?" Liu Yan asked.

"The spirit stones are divided into low-grade spirit stones, medium-grade spirit stones, top-grade spirit stones, and top-grade spirit stones. You know that. There are also spirit crystals above the spirit stones, and the spirit crystals are divided into low-grade spirit crystals, medium-grade spirit crystals, top-grade spirit crystals, top-grade spirit crystals, top-grade spirit crystals, spirit stones and spirit crystals all contain no attributes of the spiritual energy of heaven and earth. The spiritual crystals of each adjacent grade are exchanged by one hundred times. The higher the spirit stones, the more spiritual energy they contain, and the purer they are at the same time." Liu Tianxiong explained.

"It turns out that the spiritual crystal is so precious. It would be great if there was a piece of spiritual crystal. The speed of advancing the spiritual crystals would definitely be faster." Liu Yan said with a longing look on his face.

"You little brat, don't dream. Even if you really give you a piece of spiritual crystal, you won't be able to use it. The spiritual energy in the spiritual crystal is too mellow and cannot be absorbed with your cultivation. Even if it is guided, your meridians cannot bear it. Therefore, don't be too ambitious in your cultivation. You must use the corresponding spirit stones in any realm. Only the suitable one is the best." Liu Tianxiong stroked Liu Yan's forehead and said with a smile.

The three of them spoke and walked, and then passed through the layers of secret doors, and then they came to a gate.

"Uncle, my nephew Tianxiong took Liu Yan and Liu Bo to the secret library to select the prizes for this martial arts performance." Liu Tianxiong bowed respectfully and said.

"You are Liu Yan and Liu Bo. I heard that your competition is very good. Especially Liu Bo must work harder and strive to reach the ninth level of Qi training before the Shenxiao trial, so that he can have a greater confidence and strive to directly enter the inner sect of the Shenxiao Sect." A mighty middle-aged man suddenly appeared in front of the gate and said with a solemn expression.

"According to the great-grandfather's teachings, Liu Bo will live up to expectations, work hard to practice, and strive to achieve good results in the Shenxiao Trial." Liu Bo answered respectfully.

After Liu Tianxiong's uncle opened the secret library, the three of them entered it together and began to choose.

This secret library can be described as vast. The outer space alone has tens of thousands of square meters. The inner space is blocked by a gate, so Liu Bo and others cannot enter it.

The three of them first came to the magic weapon area and saw rows of spiritual wood racks filled with various celestial objects and magic weapons. Among them, there were only more than one hundred celestial objects, and the most precious magic weapons were the most, with hundreds of them.

"Grandpa, why do we collect more magical weapons here than celestial weapons? Are magical weapons very precious and rare?" Liu Bo asked curiously.

"The magic weapons here are basically collected by the ancestors. The lowest level of the ancestors' collection is all magic weapons, and there are almost no celestial weapons. The celestial weapons here are collected by all the clans of the family for a hundred years. In addition, there are not many Linghu period masters who can use magic weapons in the family now, so there are more magic weapons in the secret warehouse than celestial weapons." Liu Tianxiong said proudly.

"So many celestial weapons are so dazzling, and I don't know which one is the best for me to use. How about grandpa, please help me choose it." Seeing so many celestial weapons, Liu Yan was both excited and a little distressed.

"There are brief instructions next to each celestial artifact. You can take a closer look first. All celestial artifacts will be understood. Based on your actual situation, slowly consider which celestial artifact is most suitable for you to use now. If you are not sure, I can help you refer to it." Liu Tianxiong said.

There are more than 100 heavenly weapons on the spiritual wood frame, including swords, swords, axes, forks, sticks and other common weapons, as well as some strange door hidden weapons, as well as unique items such as bells, plates, lotus flowers, pagodas, etc.

Although Liu Bo and his two had only 40 or 50 top-grade celestial weapons to choose, it was rare to see so many and such a complete celestial weapons at once, so they naturally had to study them carefully. Although they did not know how to taste, they could also broaden their horizons greatly.

Although there are many types of these celestial weapons, most of them are the most common weapons. Most of these weapons are low-grade celestial weapons, and only a few are medium-grade or above.

All the first-level bans contained in the lower-level celestial weapons are lower-level bans. According to the instructions placed next to the celestial weapons, most of the bans in these low-level celestial weapons of weapons are first-level bans of low-level sharp arrays, which means that these celestial weapons only have one function, which is to be sharper. Only a few low-level celestial weapons are equipped with low-level bans such as "fire array", "ice array", "thorn array", and "thunder-induced array".

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Chapter completed!