In the secret room, Xu Fei looked at the poison in the container, this poison has a corrosive effect on true qi, and it is difficult to refine it with ordinary alchemy methods.

The only thing he can use now is Zi Yan's killer weapon, but Zi Yan's effect on the poisonous gas is very strong, once Zi Yan is used, I am afraid that this little bit of poisonous gas will be evaporated in an instant.

Alchemy is to control the attributes of each herb, everything in heaven and earth is made of the five elements, although each herb is a wood attribute, but the different medicines contain different proportions of attributes.

Just like the thousand-year-old snow ginseng, although the main body is wood, it also contains many water attributes, and Xu Fei's purpose of asking for the thousand-year-old snow ginseng is to rely on the water attribute of the snow ginseng to protect the poisonous gas from being evaporated instantly.

Xu Fei recalled the feeling of being exposed to this poison at the beginning, and he always felt strange, he didn't feel any of the five elements in this poisonous gas!

It stands to reason that this poisonous gas is also made from medicine, but why can't he feel the attributes contained in it, Xu Fei took out a small bottle from the ring again.

The poison in this bottle was obtained from the killer he had encountered before, the poisonous ghost night cultivator, and this poison also had the effect of corroding true qi, but it was very different from the poison of the Huangquan Venerable.

This poison Xu Fei had done a simple study, but he didn't find out what the substance was inside, but he guessed correctly, the poison of the night cultivation was just a little bit refined from the poisonous gas.

Xu Fei took out the venom, he wanted to try again if he could discover the secret inside, Xu Fei used the powerful true qi to wrap the venom.

Although the venom was eroding his true qi, this level of poison was not enough to pose a threat to him, Xu Fei closed his eyes and entered an ethereal transformation, and began to feel the changes in the venom.

After exploring for a long time, Fei suddenly opened his eyes violently, staring at the venom.

Just now he wanted to find out the hidden attributes of the five elements in this venom, so that he could prepare the corresponding antidote according to the principle of the five elements restraining each other, but the research he had just done did not find the power of the five elements.

But he found something terrifying, an existence that could devour the breath of living beings!

Once, when he was 7 years old, he was practicing alone in the mountains, and accidentally entered a cave that he had never discovered, and they had lived in this mountain for a long time, but they had never found this cave.

Driven by curiosity, Xu Fei entered the cave alone, in which he felt a cold, it was an extreme cold, 7-year-old Xu Fei advanced less than ten meters, he couldn't hold on, and his whole body was frozen into ice slag.

Xu Fei, who couldn't bear it, decided to leave, but just as he turned around, a huge suction force suddenly came from the cave, trying to suck him into the deepest part of the cave.

He tried his best to get out of the cave, but to no avail, he was too weak to compete with that force, and he fell into deep despair as he looked at the hole that was getting farther and farther away from him.

Just as his consciousness was about to dissipate, he saw several figures appear at the entrance of the cave, and he didn't remember what happened after that, but when he woke up, he was back in the cabin.

From the mouths of the senior brothers, I learned that it was the master who sensed that something was wrong and rushed to save him.

But when he asked the master what was in the cave, the master shook his head: "That's something that shouldn't exist in this world, you will know it later, and I can't tell you now, otherwise it won't be good for your Dao heart." ”

I kept my mouth shut when I asked the master, and finally even sternly warned you brothers and sisters that you must never mention this matter again in the future.

Faced with the strict master, Xu Fei had no choice but to give up, but he couldn't suppress his strong curiosity, so one day he secretly ran to the vicinity of the cave.

He just wanted to see if he could find something, but to his shock, he couldn't find the cave, and the young Xu Fei wandered around for a long time.

But the cave disappeared from the mountain as if it had never existed!

This incident became a knot in Xu Fei's heart, and every once in a while, he would come to look for this cave, but he never found anything, and even called a few senior brothers and sisters to look for it together, but several of them never found it.

Even Xu Fei's senior brothers felt strange, even if this cave was filled in by the master, there should be traces! Why couldn't he even find a clue?

Many years have passed since this incident, but Xu Fei has always remembered in his heart that he knows that he is not strong enough now, and when he can reach the realm of his master one day, he must go and see what is in the hole that almost swallowed him back then.

He once asked the master why the cold didn't freeze the things around him, but the master told him that it was not cold, but death!

A kind of death brought extreme cold, and that was the first time Xu Fei knew that there was something beyond the Five Elements!

But after all these years, he had never encountered such a thing again, and he had even searched for death in the corpse, but found nothing.

It wasn't until he was investigating the poison gas just now that he finally encountered it again, that kind of extreme cold, that kind of extreme cold brought by death!

Xu Fei looked at the liquid in front of him in shock, this was refined from dead qi, or just a kind of dead qi!

But Xu Fei fell into contemplation again, the existence of dead qi should threaten human life, but whether it is this venom or poisonous gas, it is only true qi?

Xu Fei stayed in the secret room all night, and it wasn't until Shangguan Xiu came in the next morning that he pulled him out of the abyss of thought.

Shangguan Xiu looked at the person in front of him with a surprised face, his eyes were bloodshot, his hair was messy, and he was in a state of malaise: "Uh... What did you do that night?"

Xu Fei looked at Shangguan Xiu with cloudy eyes and said, "It's nothing, it's just that I studied something." ”

Looking at Xu Fei's current state, Shangguan Xiu didn't know if he was awake now, but after thinking about it and said, "In the early hours of this morning, the Demon Gate made a move and launched an attack on Yunquan Mountain. ”

Xu Fei frowned, looked at Shangguan Xiu and asked, "What is the result?"

"Tianzun Palace faced the battle head-on, relying on the terrain advantage, and beat the demon gate back. However, when the Demon Gate retreated, it was overshadowed by the Ouyang family and the Liulimen, which can be described as a heavy loss. ”

Xu Fei nodded, all this was calculated by Zhuge Yunyi, and it was also what he expected: "That's all?"

Shangguan Xiu changed his expression and said with some solemnity: "When the Demon Gate was plotted, Xia Xiu, the head of Bihan Tianchi, and the ferryman of Huangquan Mountain suddenly appeared, injured several high-ranking members of the Liulimen and Ouyang families, and left with the Demon Gate. ”

"Xia Xiu, the ferryman, hehe, the Demon Gate is really a big deal. Xu Fei smiled coldly, he knew that the appearance of these two people was not only an accident that he and Luo Xiaoli had discussed, but also the meaning of the people behind the scenes.

"What's the matter, what are your plans, when do you plan to show up?" Shangguan Xiu asked as he stared at Xu Fei.

"Don't worry, I still have something to get, and I'm going to surprise them when the time comes. Saying that, Xu Fei gradually revealed a wicked smile.

Shangguan Xiu had goosebumps for a while: "Big brother, don't you be so obscene?"

Xu Fei's face changed, and he rushed to the official cultivator and said, "Okay, you can go out." ”

Shangguan Xiu's eyes widened: "You TM figure out whose territory this is, pay attention to your identity!"

Xu Fei glanced at Shangguan Xiu, closed his eyes directly and breathed, ready to take a break and continue to study the antidote.

Seeing that Xu Fei was selling his face at all, Shangguan Xiuqi's scalp was numb, and he wanted to press him to the ground and hammer him directly, but seeing Xu Fei start pranayama, he knew that no matter what he said now, it was just hitting the cotton, so he had to hold his breath and leave.

Seeing Shangguan Xiu leaving, Xu Fei opened his eyes and looked at the venom, he could already determine that this was the poison extracted from the dead qi.

He pondered for a night, and finally let him think of a solution, since there is the breath of death, then it must be the breath of life, he found many herbs to experiment, but none of them could achieve the effect.

In fact, he thought of something that might be able to completely restrain this dead air, but he didn't want to use it.

That was the strange flame in Wu Yuqing's body, and he clearly remembered that the flame contained a majestic life force, which might be the breath of life.

But Xu Fei was unwilling to involve Wu Yuqing in this turmoil, so he had to find another way, and his hard work paid off, and finally let him find a way, maybe he could solve this dead air.

There was a fluctuation in his hand, Xu Fei took out the night god, he knew that there was a murderous aura in the night god, which was left after countless killings, Xu Fei found that this murderous aura seemed to have a slight resemblance to the dead air.

He thought about it for a long time and made a hypothesis, if the death qi was introduced into the night god, would it be possible to merge with the murderous qi and offset the harm caused by the death qi?

Although he couldn't be completely sure, he wanted to try it, and if he succeeded, not only could he solve the problem of poison gas, but he might even be able to hint at the strength of the night god.

Xu Fei, who made up his mind, took out the Bagua Array Disk, the true qi could not completely control the poisonous gas, but with the power of yin and yang transformed from the Bagua Array, it could temporarily suppress the dead qi.

Xu Fei closed his eyes and unfolded the Bagua Array, completely isolating this secret room, and at the same time began to operate the True Qi, condensing the power of Yin and Yang in the Bagua Array.

When everything was ready, Xu Fei placed the night god in the center of the array and poured out all the venom.

Taking a deep breath, Xu Fei let himself refresh himself, entered a state of high concentration, and began to use the power of yin and yang to separate the dead qi in the venom.

This was the first time he had extracted it in this way, and although it was similar to extracting the essence of the medicinal herbs, he still didn't dare to be a little sloppy, and no one knew what kind of consequences he would have if he did so.