Looking at Ling Yifeng's determined expression, Lin Yuxin couldn't help but be a little amused, it seemed that this might not be a bad thing for him, but it would motivate his cultivation even more!

Ling Yifeng took out a spiritual power to ignite the fire in the medicine tripod, the crimson flame looked extremely hot, but it still seemed to be a little less interesting than Lin Yuxin's origin flame.

However, Ling Yifeng can't care so much, it's almost a little bit, even if it takes more time, he must refine the demon core!

The spiritual power in Ling Yifeng's body was working at full strength, striving to raise the flames to the highest temperature. He took a relatively small magic core from the ring, only half the size of a fist, probably from the body of some bird's demonic beast!

Holding it in the palm of his hand and rubbing it lightly for a moment, Ling Yifeng's eyes suddenly froze, and he waved his hand to open the lid of the tripod, throwing this demon core directly into the hole, and the red tongue of fire rushed to the sky, rolling this demon core into his abdomen. He then immediately closed the lid to prevent the temperature from draining!

That day, he was watching Lin Yuxin's alchemy, he didn't have any too intuitive feelings, and now when he did it himself, he realized the problem, and he finally understood why he used a high-temperature flame to calcinate the demon core!

The outer shell of the magic core is an extremely hard thing, its freezing point is extremely low, and the highest temperature must be maintained during the calcination process.

Ling Yifeng frowned, all the spiritual power in his body was transferred out to maintain the highest temperature flame, this was not a simple challenge for him, this was a great drain on his spiritual power, he didn't know how long he could last, if the spiritual power in his body was exhausted or he couldn't succeed, then all the efforts he had made before would be in vain!

However, if he didn't do this, he wouldn't have any other way to refine the demon core, so he had no choice but to give it a try!

Lin Yuxin lazily clasped her hands around her chest and leaned against the door, and glanced at Ling Yifeng, who seemed to be very nervous, and couldn't help but laugh a little! It turned out that there were also things that could give this genius a headache, which made Lin Yuxin's heart slightly balanced.

Gently closing the door, Lin Yuxin quietly retreated.

Ling Yifeng was distracted, staring at the demon core in the furnace with all his attention, not daring to be distracted for a moment!

A full hour and a half has passed since the beginning of the Dao, but the surface of the demon core has not changed in the slightest, I remember that Lin Yuxin was at that time, an hour and a half was about to completely refine the demon core, but he had not yet burned its surface!

A trace of bitterness welled up in his heart, his flame strength was really not enough, he couldn't melt the demon core, and his spiritual power was about to be exhausted!

Sighing slightly, just as he was about to give up, suddenly, he found that a small crack had cracked on the surface of the demon core!

Ling Yifeng suddenly showed a look of surprise, although this crack was small, it proved that his previous efforts were not in vain, maybe with more effort, he could really refine the demon core!

However, the corners of his mouth showed a hint of bitterness slightly, the spiritual power in his body had been exhausted, and it was estimated that he could only last for half a stick of incense at most, and I was afraid that he would not be able to hold on until he completely refined it.

Alas, it would be good if he had broken through to the Spirit Realm by now, the spiritual power of the Spirit Realm would definitely be far better than the current one in terms of strength and thickness, and by that time, he would definitely be able to successfully refine the demon core!

Suddenly, a flash of lightning flashed in his mind, and his mind moved, and as soon as the spiritual thought penetrated into the ring space on his hand, and then, a delicate and clear small jade bottle appeared in his palm.

Probing the crack on the surface of the demon core in the Dan furnace, Ling Yifeng was really a little unwilling, and hesitated slightly, but still poured a small pill from the bottle!

Looking at the emerald green Yuan Huan Pill in his palm, Ling Yifeng showed a wry smile as if he was self-deprecating: "Do you have to consume one before you even start refining this medicine?"

Shaking his head, he still sent Yuan Huandan into his mouth.

This elixir melted in his mouth, and seemed to turn into a mass of liquid and burrow into Ling Yifeng's throat.

The pill went down into his abdomen, and Ling Yifeng felt that he didn't seem to feel anything. One, two, three......

After ten breaths passed, Ling Yifeng suddenly felt a warm current rising in his lower abdomen, which was a very wonderful feeling, and the warm current was warm and numb, surging towards his dantian.

Soon, he felt that the dantian that he was about to dry up slowly became full, and countless spiritual powers gradually expanded the dantian until it could no longer be contained, and the remaining spiritual power wandered along the meridians towards the limbs and hundreds of remains, Ling Yifeng felt that his whole body had regained full strength!

Ling Yifeng was shocked by this effect, this whole process was less than fifty breaths, and all the spiritual power he consumed had been replenished, if he relied on his own cultivation to recover, even with Ling Tianjue's profound exercises, he would have to spend at least more than an hour, he didn't expect that this little pill could be done in an instant!

"This Yuan Hui Dan is really amazing, it deserves to be a second-grade high-grade elixir!" Ling Yifeng licked his lips and couldn't help but sigh in admiration!

At this time, Ling Yifeng was full of strength, and he continued to calcine the demon core that had cracked.

Soon, half an hour passed in a flash, and the surface of the demon core was already crawling with countless cracks. It finally couldn't stand such a long roast, and it cracked with a thud!

It seemed to be a little different from Lin Yuxin's refining process, and Ling Yifeng didn't care so much, and continued to calcinate the remaining demon cores. Without the protection of the case, the contents were quickly burned into a puddle of liquid by Ling Yifeng.

"Whew-"

At this time, Ling Yifeng finally breathed a sigh of relief, gently wiped the fine beads of sweat from his forehead, Ling Yifeng did not rest, and continued to do the next step.

Now should be the concoction potion to neutralize the berserk factor of the demon core!" Ling Yifeng recalled what Lin Yuxin had said.

"One black tongue grass, half a lotus fruit, three star orchids......"

He was also honest, exactly as she said, he put in the medicinal materials one by one, refining these things and mixing them into that mass of liquid, Ling Yifeng could also clearly feel that the violent spiritual power in it was gradually weakening!

Only the last step was done, and Ling Yifeng's face showed a hint of joy.

Finally, the Qi Yuan Fruit, Living Qi Flower, Snow Ginseng and other materials were put into the furnace to slowly refine, and the small pills began to slowly take shape!

When Ling Yifeng couldn't help the excitement in her heart and trembled slightly to receive the refined Yuan Returning Pill, Lin Yuxin was also leaning against the door and looking at him with a smile, a trace of surprise floated on her face, she couldn't imagine that Ling Yifeng, who didn't have the Origin Flame, actually refined the Yuan Returning Pill!