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

Coming out of the teleportation array, Liu Bo felt the most shocked by the thick aura of heaven and earth in this space. He felt that with every breath, the true qi increased slightly, and the concentration of spiritual qi here was dozens of times that of the outside world.

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

"This is the biggest secret of our Liu Mansion, you must keep the secret here, and don't tell anyone about everything here, otherwise it will bring disaster to our Liu Mansion. Liu Tianxiong admonished with a serious face.

"Grandpa, I'll keep it a secret!"

"Don't worry, grandpa! I'll keep my mouth shut when I get outside. Liu Bo and Liu Yan hurriedly assured.

"The underground here is a five-grade spiritual vein, and the spiritual energy is more than fifty times that of the outside. It was because the ancestor discovered this spiritual vein that he settled at the foot of Daliang Mountain. The aura here is too strong, generally only when you reach the Linghu stage can you retreat here for a long time, and you can also come here during the concentrating period when you break through the small bottleneck, and you can't cultivate here during the qi training period. On the one hand, it is for the sake of secrecy, and on the other hand, it is because of the cultivation here, the speed of absorbing spiritual energy is too fast, and the realm of the qi cultivation period is not easy to control, and it is inevitable that it will go crazy. Liu Tianxiong said.

"Grandpa, is the grade of the five-grade spiritual vein very high?, how is the spiritual vein graded?" Liu Bo asked curiously.

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

"Grandpa, I've only heard of spirit stones, what is a spirit crystal?" asked Liu Yan.

"The spirit stones are divided into low-grade spirit stones, medium-grade spirit stones, high-grade spirit stones, and top-grade spirit stones, you know. There are also spirit crystals on top of the spirit stones, and the spirit crystals are divided into lower-grade spirit crystals, medium-grade spirit crystals, high-grade spirit crystals, and top-grade spirit crystals. The exchange of spirit stones and spirit crystals of each adjacent grade is a hundred times different. The higher the grade of the spirit stone and spirit crystal, the more aura it contains, and the purer it is. Liu Tianxiong explained.

"It turns out that the spirit crystal is so precious, if only there was a piece of spirit crystal, absorbing the spirit crystal to cultivate, the speed of advancement must be faster. Liu Yan's eyes lit up, and he said with a yearning expression.

"Stinky boy, don't have sweet dreams, even if you really give you a piece of spirit crystal, you won't need it. The aura in the spirit crystal is too mellow, and with your cultivation, you can't absorb it at all. Even if it is channeled, your meridians will not be able to withstand it. Therefore, don't be too ambitious in your cultivation, you have to use the corresponding spirit stones in any realm, and only the right ones are the best. Liu Tianxiong flicked Liu Yan's head and said with a smile.

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

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

"You are Liu Yan and Liu Bo, I heard about your competition, and they are all very good. In particular, Liu Bo must redouble his efforts and strive to reach the ninth level of Qi cultivation before the Shenxiao trial, so that he can have greater confidence and strive to directly enter the inner gate of the Shenxiao Sect. A mighty middle-aged man suddenly appeared in front of the gate and said with a solemn expression.

"Obey Grandpa's teachings, Liu Bo must live up to expectations, work hard to cultivate, and strive to achieve good results in the Shenxiao trial. Liu Bo replied respectfully.

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

This secret vault can be described as vast, the outer space alone has tens of thousands of square meters, and the inner space is blocked by a gate, and Liu Bo and a few people cannot enter it.

The three of them first came to the magic weapon area, only to see rows of spiritual wood shelves, full of all kinds of celestial weapons and magic weapons. Among them, there are only more than 100 heavenly weapons, and the more precious magic weapons are the most, with hundreds of pieces.

"Grandpa, why is it that there are more magic weapons in the collection here than heavenly weapons, aren't magic weapons very precious and rare?" Liu Bo asked curiously.

"The magic weapons here are basically collected by the ancestors, and the lowest level of the ancestors' collections are all magic weapons, and there are almost no heavenly weapons. And the celestial artifacts here have been collected by the clansmen of the family for a hundred years, and there are not many Linghu stage masters in the family who can use magic weapons, so there are more magic weapons in the secret library than heavenly weapons. Liu Tianxiong said proudly.

"I'm dazzled by so many celestial weapons, and I don't know which one is the most suitable for me to use, or grandpa, you can help me choose it." Seeing so many celestial weapons, Liu Yan was excited and a little distressed.

"There is a brief explanation next to each celestial artifact, you can take a closer look at it first, and all the celestial artifacts will be understood, and in combination with your actual situation, you will slowly consider which celestial artifact is most suitable for you to use now. If you're not sure, I can help you with that. Liu Tianxiong enlightened.

The more than 100 pieces of heavenly weapons on the spiritual wood shelf have a wide variety, including knives, swords, axes, forks, sticks and other commonly used weapons, as well as some strange hidden weapons and strange items such as bells, plates, lotus flowers, pagodas, etc.

Although Liu Bo and the others only have forty or fifty top-grade celestial artifacts to choose, it is rare to see so many and such complete celestial artifacts at one time, so the two of them naturally want to study it carefully, although they don't know how to taste, but they can also greatly broaden their horizons.

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 celestial weapons.

According to the instructions placed next to the celestial weapons, most of the prohibitions in these blade-type lower-grade celestial weapons are the first-grade sharp array prohibitions, which means that the only function of these celestial weapons is to be sharper. Only a small number of low-grade celestial weapons are laid out with low-grade first-level prohibitions such as "Fire Array", "Ice Array", "Thorn Array", and "Thunder Channeling Array".

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