Although I was a little disappointed, I was helpless. Lin Yuxin knew that Ling Yifeng's spiritual strength was not much worse than her, since he hadn't discovered it even by himself, he probably wouldn't be able to find anything even if he went in person!

"Maybe it's really you who sensed it wrong!" Ling Yifeng comforted softly.

Lin Yuxin had no choice but to give up.

In the next few days, Ling Yifeng came to her for alchemy, and she wandered to the door of this ancestral hall from time to time, but since then, she has never noticed the same feeling!

On the sixth day, Ling Yifeng had finally perfected the last pot of elixir.

Looking at the porcelain vases all over the place, Ling Yifeng's heart was filled with a sense of accomplishment, and he was even more excited when he thought that Lin Yuxin was about to teach him to refine a second-grade pill that could quickly restore his spiritual power!

"Oh, it's finally finished, isn't it?" Lin Yuxin has always been absent-minded these days, and at this moment, when she saw Ling Yifeng running out of the room where she was refining, she also asked casually.

"What's wrong with you, are you still thinking about that?" Ling Yifeng asked.

"No, I think something else...... Forget it, it doesn't matter, the pill you have refined will come and check it for me, and see if you want to fool around!" Lin Yuxin casually changed the topic.

She didn't really believe Ling Yifeng, these days Ling Yifeng was refining pills almost without leaving home, Lin Yuxin saw it in his eyes, his enthusiasm surprised Lin Yuxin, once he made up his mind to do something, he must insist on doing it well, otherwise he would never give up!

Randomly opened a small porcelain bottle, Lin Yuxin smelled the medicinal fragrance slightly, then nodded slightly, and then randomly selected a small bottle, and put it down after checking it.

"Yes, the medicine you refined is qualified!" Lin Yuxin praised.

"That's great, you can quickly teach me to refine the second-grade elixir that restores spiritual power!" Ling Yifeng showed a look of anticipation on his face.

"Look at you, you've just finished refining so many pills, aren't you going to rest and rest?" Lin Yuxin rolled her eyes at him, and then said, "If you don't want to rest, go and prepare the rest of the materials!"

"The rest of the materials?" Ling Yifeng looked at Lin Yuxin suspiciously: "Aren't all the medicinal materials bought and put here?"

"Those are just simple herbs, refining the second-grade pill also requires other auxiliary materials!" Lin Yuxin said unhurriedly: "Why does a high-grade pill have such a magical effect? It is not only the effect of simple herbs, but also a lot of other auxiliary materials, such as heavenly and earthly treasures!"

"This second-grade elixir doesn't need any high-grade heavenly and earthly treasures, only the magic core!" Looking at Ling Yifeng's still dazed expression, Lin Yuxin said slowly.

It turns out that the magic core of the demon beast is very versatile, and it itself has a very large amount of spiritual power, and after being concocted by special means, it can directly absorb spiritual power from it and promote the rapid circulation of its own spiritual power! But it is a drop in the bucket to absorb spiritual power in this way, and the human body cannot absorb the violent spiritual power sealed in the magic core at all, even after special concoction, it can only absorb a small part of it, and the effect is very small!

However, the pill master has a way to refine all the violent spiritual power in the demon core into soft spiritual power, and mix it into the refined elixir, which can speed up the absorption of that spiritual power by the human body!

In addition, forging the magic core into the weapon can also enhance the attribute power of the weapon, or using it as the formation base of the formation technique, it can also greatly enhance the power of the formation technique, about this, Ling Yifeng is most familiar with!

It turns out that the second-grade pill needs to use the magic core, no wonder the high-grade pills are so expensive, and the original materials are not cheap!

"Isn't it the Demon Core? No problem, I'll get it for you!" Ling Yifeng smiled and prepared to go out.

"Wait a minute, you haven't heard me finish yet, what's the hurry!" Lin Yuxin stopped him and glared at him: "The medicine I want to teach you to refine is called 'Yuan Huan Dan', in addition to these medicinal materials here, you also need a large number of demon cores above the second order!"

"Second Order?" Ling Yifeng was slightly stunned, the first-order demon core is good to say, this second-order demon beast has the strength equivalent to the human spirit yuan realm, if he encounters one, he may not be able to beat it! But if you go to the market to buy it, the price of this second-order demon core is about one thousand gold baht! Although Ling Yifeng is not short of money now, it is really a bit painful to want to spend thousands of gold baht to buy a magic core!

"The grade is naturally above the second order, the higher the better!" Lin Yuxin bit her tongue and showed a sly smile, and continued: "And the attributes are also required, the wood attribute is the best, and the water attribute is second!

Ling Yifeng squirmed his lips, he didn't say anything for a long time, there are very few wood-attribute cultivators, wood-attribute demonic beasts are also relatively rare, wood-attribute demonic cores are generally five or sixty percent more expensive than the price of other attribute demonic cores of the same level in the market!

"Okay, that's all, you can quickly find it back!Well, I'll take a look, a hundred medicinal herbs...... Ten should be about the same!"

Ling Yifeng's face twitched slightly, he still had to find ten, this was not an easy job.

None of the magic cores in his ring that are used as the base of the formation are wood-attributed! Forget it, if it's more expensive, let's go to the market first, and let's get it together first!

Ling Yifeng pushed the door out and walked in the direction of Fang City, Lin Yuxin put away her smiling face behind her back, walked to the window, frowned slightly, and set her eyes on the mountains stretching in the distance!

There are still a lot of mercenaries who sell the corpses of demon core demonic beasts in the middle branch of Fang City, but Ling Yifeng has hardly seen one with wood attributes, and occasionally finds one, but it is only a first-order quality, which obviously cannot meet Lin Yuxin's requirements!

Forget it, let's go to the Mercenary Guild and take a look, maybe they have acquired a wood-attribute magic core!But Ling Yifeng himself knows very well that the price of the wood-attribute magic core is higher than that of ordinary magic cores, and even if the mercenaries get it, they will generally not give it to the mercenary guild at a low price!