Mu Xiyun arranged the medicinal materials on the ground into a Tai Chi formation, then walked to half of it, smiled at Mu Xin'er and said, "Sister, come in!", and after a while, they were already sitting on both sides of the Tai Chi Array, each accounting for half of it.

"Sister, release your spiritual power and relax your control. Mu Xiyun reminded.

In the room, a light blue aura emanated from Mu Xin'er, who was sitting cross-legged on the ground, and a slight thunder light could be faintly seen in the aura, and the light blue light that reflected each other added a little beauty to the room.

Seeing Mu Xin'er release her spiritual power, Mu Xiyun closed her eyes, her mind moved slightly, her spiritual power was released, and she quietly felt all the spiritual power fluctuations around her.

Mu Xiyun felt the spiritual power around him, pure and vast, as if he was bathed in a sea of light blue spiritual power, and he didn't know how many times stronger than his own spiritual power.

As if he had captured some kind of opportunity, he saw Mu Xiyun's hands dancing instantly, and finally, he maintained a gesture with his hands together and his two index fingers up.

Soon, the surrounding spiritual power seemed to feel Mu Xiyun's call, and slowly approached Mu Xiyun's hands, flowing with his dance.

After more than a dozen breaths, the spiritual power in Mu Xiyun's hand had already condensed to the size of a fist.

Looking at the light blue aura in his hand, Mu Xiyun's face was overjoyed, obviously, he used the psychic phantom hand of the first realm of the Hell Luo Black Hand to successfully pull Mu Xin'er's spiritual power into his hand.

The main reason for being able to do this so easily is the tacit understanding they have cultivated over the past ten years, and they know each other very well when they stay together all the time, which also makes Mu Xiyun's control of Mu Xin'er's spiritual power not obscure.

Mu Xiyun slowly separated his hands, and suddenly, two spiritual qi balls of the same size appeared in his hands.

Reciting the mantra of the Black Hand in his heart, the color on the palm of his hand gradually changed, and a gray color appeared, which gradually deepened until the entire arm turned black.

Seeing this, Mu Xiyun took out a new row of silver needles from the space ring, which had been specially prepared for awakening the spiritual veins in advance in the past few days, and it was mixed with psychic concentrate, unlike the rough silver needles used to block the spiritual veins before.

Psychic Concentrate has an extremely strong spiritual power transfer effect, which can transmit a larger spiritual energy in the same amount of time.

"What is this?" The strange black aura that gradually appeared on Mu Xiyun's hands made Mu Xin'er on the side a little surprised, her pretty face was slightly condensed, and she couldn't help but ask out loud.

"My spiritual power attribute is a dark attribute, and the operation method is different from ordinary people, don't worry, it's okay. Mu Xiyun replied confidently.

Mu Xin'er's consternation was within his expectations, and he had already thought of a reply early, and it didn't make Mu Xin'er have any doubts.

In fact, this is actually one of the characteristics of the exercises of the black hand of the prison Luo.

But Mu Xiyun would not tell Mu Xin'er that the exercises he practiced were made by the black hands of the prison Luo, and when he heard the name, he felt that it was not a righteous path exercise, which would inevitably make Mu Xin'er worried, so he simply concealed it.

Then, Mu Xiyun guided the black qi around his body to flow to the silver needle, just like when he sealed the spirit.

Soon, all the forty-eight acupuncture points around the body had been awakened, and there was still the last Heavenly Spirit Acupoint left.

Feeling the power of awakening in his body, Mu Xiyun's face suddenly showed a touch of expectation, and then his gesture changed slightly, slowly gathering the surrounding Hell Luo black qi at the third needle of Hell Luo, and finally piercing it on the third Heavenly Spirit Acupoint, the place where the spirit was sealed.

At this time, Mu Xiyun clearly felt that there was an incomparably domineering dark attribute spiritual power in his body surging to all the meridians of his body, frantically absorbing the colored spiritual power around Mu Xiyun's body, as if he would never be satisfied.

Feeling the power in his body, there is an aura that belongs to him and an aura that does not belong to him, but strangely does not appear to be repulsed, but slowly merges.

Looking at this scene, Mu Xiyun's eyes widened, and he was a little incomprehensible.

According to Mu Xiyun's understanding, the dark spiritual vein has the power to devour, and if it does not awaken, it will devour the lifeline of the martial artist and become angry until death.

Once awakened, you can absorb the spiritual power of others to a certain extent and use it for your own use.

Prior to this, Mu Xiyun expected that after the spiritual vein awakened, it would absorb more spiritual power than the normal dark spiritual vein awakening, because it was Mu Xin'er who assisted Mu Xiyun, and Mu Xin'er's spiritual power had a high affinity for Mu Xiyun, so it could be directly absorbed without quenching.

But Mu Xiyun didn't expect that the amount of spiritual power absorbed by this dark spirit vein was too large, several times more than he expected, this was definitely not an ordinary dark spirit vein, but at this time, he didn't have the heart to think too much, and there were more critical things to complete.

"Sister, increase the infusion of aura, I want to take this opportunity to break through in one fell swoop. Mu Xiyun saw that the dark spiritual vein had been fully awakened, and hurriedly said to Mu Xin'er.

Mu Xin'er didn't respond, but the jade hand changed its gesture slightly, and the momentum on her body instantly swelled several times, and the aura rushed towards Mu Xiyun like a fierce beast.

An hour later...

Mu Xiyun gently lifted the hands on his knees, slowly put them away, and exhaled a breath of turbidity.

Finally, the spiritual vein was successfully awakened, and after that, it will no longer be corroded by the dark spiritual vein's anger on the lifeline.

And the lifeline vitality that was devoured before will also slowly recover, because the lifeline vitality does not disappear, but is stored in the dark spirit vein.

At this time, Mu Xiyun obviously felt that the meridians in his body had become thicker, the spiritual power that could operate had gradually increased, and his cultivation had also been directly improved from the second realm of opening the pulse to the seventh realm of opening the pulse.

Although he hadn't improved his cultivation for more than ten years, it was because he had been eroded by the dark spirit vein, so he couldn't improve. With the awakening of the dark spiritual vein, the spiritual power accumulated in the body instantly broke through the shackles of cultivation and reached the Seven Realms of Open Pulse.