"Come in. Du Fan's figure flickered, and instantly moved from the secret room to the stone hall, and at the same time, the water curtain at the entrance of the cave opened.

"Master, did your retreat go smoothly?" Chu Ling'er came to Du Fan and asked with concern.

Du Fan shook his head and changed the subject: "You came in a hurry, is there anything important?"

"It's not a big deal, it's just that half a month ago, when the second master was refining the elixir, he inadvertently ignited the Qi herb as an auxiliary material, and the grass was wiped out in an instant, but there was a wisp of invisible things similar to the energy body floating out, but unfortunately, this wisp of energy body was still not preserved in the world for a long time, and it could not be captured.

The second master has no intention of paying attention to this matter, she knows that you have studied the herb of Qi, so she instructed me to inform you of this matter when you leave the customs, which may bring some help to your research ideas. Chu Ling'er replied seriously.

"There is such a thing...... Du Fan was slightly stunned, and immediately raised his hand to grasp the void, and after a trembling herb planted in the spiritual garden, it suddenly rose from the ground and appeared in his hand in a flash.

Under the manipulation of the law, a ball of fireball emerged, and the herbs ignited when they touched it, turning into ashes in an instant.

Du Fan was engrossed, and the next moment, his pupils suddenly shrank, and his hands quickly pinched, condensing a layer of invisible qi with Danhai Qi, wrapping a wisp of unknown things that appeared out of thin air in it, preventing it from dissipating.

Du Fan breathed a sigh of relief, and then let out his divine thoughts, exploring and studying the unknown objects in the air cover.

He soon came to the conclusion that this unknown thing gathered was the essence of the medicinal properties of Qi Vanilla, which had the effects of intensive cultivation, powerful divine consciousness, and increasing longevity, and the medicinal properties were very significant.

Du Fan didn't say a word, opened his mouth and sucked it in suddenly, and swallowed the unknown thing into his stomach along with the air cover.

Du Fan's action made Chu Ling'er stunned, this woman looked at her master, stunned for half a cup of tea, then reacted, and asked with a little worry: "Master, you just ate something like this, how do you feel?"

Du Fan smiled slightly: "It feels great." ”

"What does it smell like?"

"Whoever eats knows!"

“...... Master, can you be serious, Ling'er is very worried about you!" Chu Ling'er couldn't cry or laugh.

"Okay, then be a serious teacher. Du Fan put away his smile and said, "The unknown energy body produced after the burning of the Qi herb does have many miraculous effects on the monk...... Let's not talk about it, you can try it and feel it. ”

As he spoke, Du Fan grabbed a herb again, lit it, forced out a wisp of invisible things, and restrained it with an air hood, and sent it to Chu Ling'er.

Ling'er, open your mouth. ”

Chu Ling'er stared at the thing in front of her, her face was disgusted, her little brows were furrowed tightly, and she looked reluctant, but under Du Fan's repeated urging, this woman could only sigh secretly and open her mouth slightly.

The moment she opened her mouth, the air shield enveloped the unknown, and it disappeared into her mouth in an instant.

After a while, a different color appeared on Chu Linger's pretty face, and her frowning brows also relaxed.

"Do you feel a change in yourself?" asked Du Fan.

Chu Ling'er nodded and replied: "Well, the cultivation is a lot thicker, it is probably worth an hour of tuna cultivation, and in addition, after swallowing this thing, I only feel refreshed, my mind is clear, and my divine sense is also a little stronger...... It seems that there are other benefits, but at the moment, Ling'er's realm is low, and there is no way to perceive the specifics. ”

"An hour of cultivation? Hehe, that's you, if you change to another cultivator with average qualifications, it is worth at least a week of penance! And you are right, this thing does have an indescribable effect on the monk's divine consciousness, and what is even more rare is that in the process, there is actually no side effect, you know, even the highest grade elixir, it is impossible to do this. ”

"In this way, the herb has become a holy medicine against the heavens, but others have not yet found the correct way to take it like Master. Chu Ling'er's expression moved, and she suggested: "Master, why don't you compile this matter into a written message, imprint it in a jade slip, and then submit it to the Escape Hall, so that the monks and mortals of the whole continent can benefit from it." ”

When Du Fan heard this, his eyelids jumped, and he immediately waved his hand and said: "By all means, the teacher suddenly remembered that there is something wrong with the method of burning Qi herbs, and there is a huge hidden danger lurking in it, so the matter of reporting to the Escape Hall needs to be considered in the long run!"

"Master, didn't you just say that there are no side effects, why is there a problem again this moment?" Chu Ling'er was puzzled.

Du Fan's expression became serious, and he said in a deep voice: "Side effects and hidden dangers are two different things, and, Ling'er, you think, this world is balanced, and it can be worth a week's penance in the blink of an eye, how can there be no price? If this brings disaster to hundreds of millions of living beings in the Heaven Covering Continent, then it will be a great sin to be a teacher!"

Chu Ling'er thought about it carefully, felt reasonable, and realized the seriousness of the problem, and then fell into silence.

Du Fan glanced at his apprentice, feeling that the frightening was almost over, so he softened his tone and advised: "Ling'er, you have to keep this matter of Qi Herb secret, and you must not leak it to the outside world, so as not to harm others. ”

"Yes, everything is according to Master's wishes!" Chu Ling'er nodded solemnly and responded to the matter.

"Let's do this for the sake of the herbs. Du Fan smiled, changed his words, and said, "Tell me, what did Fairy Xu Zhao teach you during the year of retreat?"

Next, the master and apprentice talked about cultivation, and Du Fan sometimes pointed out a few words, which often played a role in the empowerment of Chu Ling'er, which made this woman suddenly open up and benefit a lot.

Three days passed in a hurry, and after Chu Ling'er left, Du Fan immediately blocked the cave mansion and ran to the secret room to study the herbs.

Originally, the extraction of Qi vanilla essence was the biggest problem in the whole process, but Xu Zhao inadvertently solved it, so that the idea of research was clear, and the matter was mainly divided into four points:

1. Burn the herbs.

2. Condense the unknown after burning and do not let it drift away.

Third, come up with a simple and effective method of combustion, you can't use the fireball technique every time, and then wrap it in Danhai air, which is too time-consuming, and it can't make ends meet, and some gains outweigh the losses.

Fourth, it is necessary to cover up the smell of mantine herbs to avoid leaking wealth and causing trouble to yourself.

......

After a month, Du Fan sat cross-legged on the futon, holding a cigarette between his fingers, took a hard puff, squinted his eyes, and showed an expression of enjoyment.