Two hours passed in the blink of an eye, and the room was quiet, and the sound of falling leaves in the courtyard could be heard, because it was already late autumn, and the leaves began to wither.

"The art of the underworld, the creation of the sea of knowledge, human beings have nine seas of knowledge, but these seas of knowledge are empty, and some people can open up some seas of knowledge, such as some can comprehend their own way, these rules will enter their own sea of knowledge" Chen Xuan looked at the cultivation method of the art of the god of the underworld a few times, and basically knew the reason for the spiritual power.

There are even people who comprehend several kinds of Dao, this is the genius of geniuses, the more the sea of knowledge is opened, the greater the combat power, the sea of knowledge is the portals in the sea of souls, there are a total of nine portals in the sea of souls, erected in the nine directions of the sea of souls, corresponding to the nine seas of knowledge, these portals are closed at this time, only when you reach the earth spirit realm, you may be able to open one of the portals, as long as you open it, that means that you have entered the earth spirit realm.

Chen Xuan did not reach the Earth Spirit Realm at this time, which means that it is impossible for Chen Xuan to open his own sea of knowledge, but at this time, the 'Technique of the Underworld' focuses on purely absorbing the soul to open up his own sea of knowledge, so as to open the door to the spirit.

"Ghost Dao, weird, the yin qi that seizes the heaven and earth, absorbs the essence of the sun and the moon, picks the cold spring of the underground, the ghost Dao, the Dao of life and death, life is death, death is life, the cycle of life and death, the ghost Dao!" Chen Xuan tasted the introduction of the 'Art of the Underworld'.

"If you go out, cultivate, no one knows what it will be like in the future, once you cultivate the art of the underworld, your strength will be able to rise to a higher level" Chen Xuan was ready.

Chen Xuan began to operate according to the cultivation method of the 'Technique of the Underworld', because the cultivation of this exercise did not require a physical body, so he did not need any energy to run in the body at all, just relying on meditation, Chen Xuan closed his eyes and began his first cultivation according to the meditation on the Technique of the Underworld.

"What is the ghost energy, what is the yin energy, yin and yang are separated, yin is yang, yang is yin, only yin and yang can be balanced, anything once it is out of balance, it will be the opposite, once the yin energy is absorbed too much, the yang energy is naturally out of balance, then it is really possible for him to become a monster who is not a human or a ghost, it seems that he will have to practice a practice of absorbing yang energy in the future, so that he can balance yin and yang in the future!" Chen Xuan said secretly.

Chen Xuan's mind was completely silent, his divine sense came to his soul sea, looking at the crystal walls around the soul sea, he saw the nine phantoms hovering in the nine directions of the soul sea, "Is this your own nine consciousness seas, which one is your own spiritual power consciousness sea." ”

In the dark, a cold aura flowed into these many rooms, and Zhou Lishan, who was sitting on the bed, suddenly shivered, feeling a sudden chill all over his body, and streams of yin qi began to float towards this room.

"What is this Chen Xuan doing, how can there be so much yin qi flowing in, is he cultivating some yin qi, but he can't, he is a disciple of the Danxuan Sect, it is impossible to cultivate such a cold exercise, and this is not an ice exercise, it is completely a creepy yin qi, that is, death qi, the death qi that turns into death after death, what does he want to do!" Zhou Lishan said secretly.

But at this time, Zhou Lishan's body couldn't move, because Chen Xuan's right hand was still suppressed on his body, and the energy of the soul stone was still constantly besieging the energy mass formed by this dark cloud-like 'black bone grass'.

After these dead qi entered the room, they began to float towards Chen Xuan, and the dead qi slowly began to float above Chen Xuan's head, and finally slowly submerged into Chen Xuan's soul sea, but when he entered the soul sea, Chen Xuan began to control the 'Hades Technique' to continuously refine these yin qi, because there are also a lot of resentments and resentments, these things cannot be brought into his soul sea, otherwise he will slowly be controlled by these resentments in the future.

After being refined, these dead qi began to submerge into Chen Xuan's head, entered Chen Xuan's soul sea, and entered the designated sea of consciousness.

The west side itself is the yin side, so the yin qi flew towards the west side, flew to the front of a portal and stopped, did not advance again, Chen Xuan's spirit also came to the front of this portal, looking at the sea of knowledge that was about to be developed.

Chen Xuan didn't know if it was a good thing or a bad thing, because Li Lao couldn't give him any guidance, because Li Lao hadn't seen such a thing as 'Hades Technique' at all, but Li Lao had told Chen Xuan that there were once people who opened up their own five realms, because he turned out to be five attributes, comprehended five kinds of his own Dao, and finally ascended after a thousand years, becoming a legend in the Heavenly Spirit Continent.

These yin qi continued to hover above this portal, and the yin qi outside was still flying towards this side, and the dead qi in the soul sea gathered more and more, and finally began to form a small gray vortex, which began to crash towards this portal.

"Boom!"

The first impact of these yin qi sent out an earth-shattering muffled sound in Chen Xuan's soul sea, and Chen Xuan's soul was so shocked that he almost fainted, and then the second round of attacks began again, and these yin qi crashed towards this portal.

Once, twice....... Ten ..... Twenty times, I still didn't knock open the gate of the sea of knowledge, but the gate of the sea of knowledge obviously began to loosen.

The yin qi gathered more and more, coupled with the fact that this portal was getting looser and looser, and the force generated by the impact was also increasing, and there was a violent roar, and this white portal was finally smashed open by this yin qi, and a virtual space appeared inside.

Chen Xuan's divine soul also came to the top of this portal, looking at this portal, he felt that streams of spiritual power were constantly generated, and his spirit began to become more excited, and his soul power also seemed to have something to rely on, becoming excited, and even Li Lao was beginning to absorb this spiritual power.

Chen Xuan's divine sense saw that this sea of consciousness was like a starry sky, and the spiritual power in it was emitted from here, and human beings themselves also had spiritual power, but now after Chen Xuan opened the spiritual door, it was simply the difference between heaven and earth, Chen Xuan now felt that his soul sea had become very full, and a vigorous spiritual coercion emanated from Chen Xuan's soul sea.

Strands of spiritual power dispersed to all sides, past the door, over the courtyard wall, this is not soul power coercion, soul power coercion can only be useful to people with low realms, because soul power is divided by realm, but spiritual power is different.

Soon chickens and dogs began to jump in the yard, and figures flew out of the hidden corners one by one, all of them felt a headache, and some people began to pinch their heads with both hands, fiercely resisting this spiritual coercion.

But no matter how you resist it, these spiritual powers are slowly eroding into the other party's soul sea, because it absorbs the soul of people, and some people began to lie on the ground and roll, and a wail came out of their mouths.

Although Zhou Lishan's body couldn't move at this time, his facial features were still normal, and his divine sense was also emanated, every move in the courtyard was within the scope of Zhou Lishan's divine sense, looking at these masters he had cultivated with his own hands on the ground and wailing, looking at Chen Xuan with shocked eyes.