Lin Feng carefully observed the Dan furnace in front of him, three-legged, spired, and dark, with faint patterns engraved on the furnace body, but now the Dan furnace was covered with dust, and it was obviously not used for a long time.

Lin Feng injected his mana into it, but the Dan furnace did not react in the slightest, and put some medicinal herbs into it, and there was no movement.

"It's weird. Lin Feng scratched his head, no wonder this Dan furnace looked very old, it had not been used for a long time, it looked like a waste product without the slightest spirituality.

But Lin Feng didn't intend to doubt Zhu Yi's luck, he entered the exchange system and opened the list to find the same.

The strange pattern on the furnace body can be used as an important logo.

The hard work paid off, and Lin Feng almost found a Dan furnace at the bottom of the list, with characteristics very similar to the one he had at hand.

The Outer Heaven Heart Furnace is fired with Outer Heaven Meteoric Iron, and when alchemy, it generates its own heart fire and adds a strong firepower, so it can greatly improve the success rate of alchemy.

Required redemption points...... 3000 points!

Lin Feng patted his head, and couldn't wait to go to the next room immediately to hug Zhu Yi and kiss him.

3000 points, he can't make up so many exchange points after selling it.

From the start of the system to the present, even counting the newbie package, the total amount of exchange points that Lin Feng has accumulated is only 2,800 points.

Lin Feng now has seven hundred exchange points on hand, which is only enough to buy one leg of the Heavenly Heart Stove.

"Yes, it's really good!" Lin Fengle blossomed, but then a question arose in his heart.

Since this Dan furnace is so good, why has no one found out?

One or two can't discover the mystery of the Dan furnace, and all the people who handle it can't find it?

With this question, Lin Feng carefully checked the information of the Outer Heart Furnace and found that there was a description in it: "Only the Seven True Flames can make the function of the Outer Heart Furnace to the extreme." ”

Lin Feng blinked, his mouth was slightly bitter, and he finally understood why others couldn't find out the magic of this Dan furnace.

The Seven True Fires, the pinnacle of firepower in this world, each of them can infinitely increase its power, domineering and boundless, destroying the world, how can its fire be so easy to get?

Lin Feng pressed the temples that were pounding on both sides, told himself to calm down, and pondered the information description of the Outer Heart Furnace word by word.

"Push it to the limit...... In other words, the spiritual fire that is slightly lower than the level of the Seven True Flames can also make this Dan furnace work, but it can't give full play to its function. Lin Feng pondered a little: "The more advanced the spiritual fire, the more obvious the effect, if the spiritual fire level is too low, it will not be able to drive this Dan furnace." ”

Thinking of this, Lin Feng's heart settled down.

Fudo Ming King Fury is recognized as a high-level spiritual fire second only to the Seven True Fires.

Lin Feng immediately laid out the Twenty-Four Heavenly Arhat Array, and then according to the previous method, with the three Flame Arhats as the core, he condensed the Fudo Ming King's anger.

The milky white flame fell in the furnace outside the sky, and the Dan furnace suddenly changed.

It's like a giant who has been sleeping for a long time has finally woken up.

Around the milky white Fudo Ming King's anger, a red flame lit up with a "bang", jumping and jumping, like a beating and powerful heart.

With the beating of this "heart", fiery red lines appeared on the inner wall of the Dan furnace.

At this time, the Outer Heaven Heart Furnace, which was originally only the size of a palm, rapidly grew larger, until it was two meters high and nearly two meters in diameter before it stopped, and landed steadily on the ground, revealing an astonishing mana fluctuation from it.

Lin Feng laughed: "That red flame like a heart should be the so-called heart fire, hmm...... It is really extraordinary, and the power of flame burning is not much worse than the anger of the immovable king. ”

Cultivators who are good at alchemy, the Dao method they practice is often a fire-based Dao method, and they must use their own mana to be cremated into Dan Fire to refine the elixir.

Lin Feng practiced the Immovable Ming King Technique, and the mana pill fire was available, but he had never refined the pill before, and he couldn't help but feel worried in his heart.

Putting the medicinal materials for refining the Lei Yin Great Returning Pill into the Dan furnace, Lin Feng began to carefully control the Dan Fire.

Sometimes, I have to admit that learning something is really talented.

Lin Feng was tired and tired, tossing for a long time, and after the most sloppy time, he opened the furnace to take the pill, and only a furnace of coke appeared in front of him.

"Is the firepower too fierce? Or is the medicinal herb not right?" Lin Feng scratched his head in distress, the medicinal herbs were still much richer, but he couldn't practice his hands like this.

Lin Feng frowned and thought for a moment, then a spiritual light suddenly flashed in his mind.

"You brothers and sisters have come to the teacher's room and carry your brothers together. Lin Feng calmly transmitted the message to Zhu Yi and the others next door, and then sat cross-legged and waited for a few apprentices to arrive.

Xiao Budian was the first to push the door in, looking at Lin Feng with a question mark, and the extraterrestrial furnace in Lin Feng's room that was about to stab to the roof.

Behind him, Zhu Yi and Wang Lin walked into the room one after the other, carrying a stretcher, Xiao Yan was lying on the stretcher, his face was pale, but his mood was not bad.

"The disciple has seen the master. The four of them said together, except for Xiao Yan, who was lying down and couldn't move, the other three bowed down together.

Lin Feng nodded lightly, and then said, "You have all seen this Dan furnace in front of you, right?"

The four of them nodded together, and Zhu Yi asked, "Master, is this the Dan furnace when I was in Fang City before?"

Lin Feng smiled slightly: "This furnace is called the Heavenly Heart Furnace, and it is infinitely useful, but it is a pity that the pearl was dusty before, and now it has been reactivated for the teacher, so that it can show its true face." ”

Zhu Yi was surprised: "It's really a strange thing." ”

Xiao Budian on the side asked, "Master, did you call us here to see this Dan furnace?"

Lin Feng shook his head and replied, "No, the teacher called you here to test you." ”

Test us?

The four of them looked at each other, and Xiao Yan on the stretcher said softly: "If there is any test, please ask Master to show me." ”

Lin Feng pointed to the furnace outside the heavens, and said lightly: "In order to heal Xiao Yanzi's injury, the master is refining a pill right now, but the teacher deliberately made a few mistakes in a few places, and if he practices like this, he is destined to not be able to refine the pill." ”

"As a teacher, I want to test you now, to see if you have a natural spirituality for alchemy, and whether you can pick out a few mistakes and omissions deliberately left by the teacher. Lin Feng said solemnly, handed them the pill recipe of Lei Yin Da Returning Dan, and carefully explained the function of the Outer Heaven Heart Furnace.

"Am I too shameless? It's just average......" Lin Feng turned his mind around, his face still looked sanctimonious, and he said lightly: "You can discuss with each other, the teacher is just listening, who puts forward the correct opinion, the teacher knows in his heart." ”

The four of them glanced at each other, then gathered around Xiao Yan's stretcher and discussed head to head.

Lin Feng secretly listened to what they discussed, and then compared it with his own opinions, which was quite rewarding.

I have to say that the system's judgment is very accurate, among the four people, Xiao Yan has the fastest and deepest understanding of alchemy, and Xiao Yan has the fastest and most understanding of the mistakes and omissions in Lin Feng's original alchemy method.

As for whether it is accurate, it remains to be verified.

After arriving at the end, the other three also took the initiative to elect Xiao Yan to make a concluding speech.

“...... The Heavenly Bone Grass cannot be put into the Dan furnace for refining in its entirety, it must be ground into pieces first, and the frost dew and the blue fire phosphorus grass must be mixed together before they can be put into the Dan furnace for refining, and cannot be put separately. Xiao Yan summed up and said, after hesitating for a moment, he continued: "In addition, the disciple thinks that the furnace opening time should be advanced by half an hour, but I am not sure about this. ”

Lin Feng's expression was calm and calm, and after listening to Xiao Yan say everything, he raised his head and asked the other three, "Do you have anything else to add?"

The other three all shook their heads, and Lin Feng smiled and said, "It's all done, don't change it?"

Xiao Yan gritted his teeth: "Don't change it." ”

Lin Feng stood up and said with a smile: "Don't comment too much for the teacher, let's let the facts speak, and then use your method to refine a furnace of pills and see what the result is." After that, according to what Xiao Yan said, deal with the medicinal materials and open the furnace for alchemy.

Lin Feng controlled the fire, and the four apprentices all watched the Dan furnace closely, Xiao Yan was especially nervous, and his palms were a little sweaty.

The four of them didn't know what to do, in fact, Lin Feng was more nervous than them, staring at the Dan furnace with blank eyes: "Stinky boy, you must be powerful." ”