The higher the grade of the elixir, the longer it will take to refine.

Lu Qingan was concentrating on refining the elixir and found that he did not encounter any difficulties when refining the sixth-grade immortal elixir, and it was still going smoothly.

The refining time is more than half slower than that of refining a fifth-grade immortal pill. It takes almost half a day to refine a sixth-grade immortal supreme Xuanling pill.

Yes, it is still a top-grade elixir. It is not difficult for him to refine elixir of this level.

The biggest problem now is that it takes longer and longer to refine the elixir.

"I can stay here for another seven months. I can finish refining all the pills before I leave."

He still felt that it was a bit of a waste of time, but fortunately the existence of Liuguang Palace made up for this difficulty.

"If I can win first place in the alchemy competition in half a year and obtain the alchemy manuscript of King Qin Dan, then everything will be easy. With my understanding of alchemy and King Qin Dan's special refining techniques, I should be able to quickly master the skill of refining two pills at once."

At that time, he could save half the time in refining pills.

"I've never heard of anyone being able to refine three batches of pills at once. If it were possible, it would save even more time."

He had already inquired and found out that among the tenth-grade immortal alchemists in the immortal world today, only a few could refine two pills at a time, and no one could refine three pills at a time.

However, it is said that the powerful Dan Emperor who only exists in legends can do it, and the Dan Emperor can even use only one elixir to refine two pills.

His skills are mysterious and unfathomable.

Lu Qing'an continued to concentrate on refining the elixir. After working continuously for half a month, he realized that his mental energy had been greatly depleted and he needed to take a break for a while.

So, he walked out of Liuguang Palace and went to Wangxu City, found Murong Yingxue, and bought elixir worth 50 million fairy stones from Murong Yingxue.

After spending these 50 million immortal stones, he had very few immortal stones left, almost all of them were used up.

The next time he comes out of Wangxu City, he will have to go to the intermediate Shouhuan Tower, exchange some treasures, and go find He Qi Jin.

Afterwards, he returned to the Liuguang Palace and came before the Black Dragon.

But when he appeared in front of the black dragon, he found that the black dragon was still stuck with the dragon-scale fairy beast.

The two fairy beasts seemed extremely close, and the dragon-scale fairy beast even curled up in the black dragon's arms, showing its charm.

"Okay, I've let you rest for a while, it's time to start working." Lu Qing'an broke the tranquility at the moment.

Seeing Lu Qing'an, the Black Dragon smiled and said, "Thank you, Master, for letting me rest for a while! How many immortal medicines do you need to burn this time?"

He obviously no longer resisted the task of burning the elixir.

"An elixir worth thirty million immortal stones." Lu Qing'an was quite impressed by Black Dragon's positive attitude.

"Oh, it's so little. Master, don't worry about us. Next time you can just bring elixir worth 100 million fairy stones!" The Black Dragon patted his chest and said proudly.

Seeing this, Lu Qingan nodded with satisfaction: "Okay, I'll prepare it for you next time."

After handing the elixir to the black dragon, he returned to the cultivation space and started refining the elixir again.

Time passed quietly. More than twenty days passed in the outside world, but in the training space inside the hall, it was already seven months.

Lu Qing'an finally refined all the sixth-grade Xuanling pills.

The number of Xuanling Pills is enough for him to cultivate to the Liuli Realm.

At the same time, his cultivation level has also been steadily rising, and now he has reached the fourth level of the Void Silence Realm!