To alchemy, the flame is extremely important, and the fire of the five elements of Bai Yu is the top flame in the universe.

Before, the White Feather Alchemy didn't need a Dan furnace at all, but only refined it with the fire of the five elements.

The alchemy technique of cultivating immortals in the world is so developed that it has long been eliminated from using the Dan furnace to refine the Dan.

However, the use of the Dan furnace for alchemy has always existed, and it has not been completely eliminated and disappeared.

Civilization is developing, and the civilization of cultivating immortals is also developing at a high speed.

This time, there is such a huge amount of heaven and earth aura in the Dan furnace, and it is best to use it for alchemy.

With the passage of time.

Under the burning of the fire of the five elements, the aura of heaven and earth in the Dan furnace has begun to condense.

The first step of alchemy has been completed, and that is to condense the Dan heart.

Then the second step is to compress the aura of heaven and earth into a little bit and integrate it into the Dan.

This is a very crucial step.

Bai Yu was engrossed, and his energy was already all in alchemy.

Minutes and seconds passed.

Bai Yu didn't know that it had passed, and he could feel the subtle changes in the Dan furnace!

With a gleam in his eyes, he was just one last step away!

If this step is successful, it will be successful, otherwise it will be abandoned and will end in failure.

With Bai Yu's current cultivation, refining this Five Elements Spiritual Qi Pill was naturally very difficult, and it was completely beyond the power he currently controlled.

The fire spiritual power in Bai Yu's body kept burning the Dan furnace.

Finally......

With a loud "boom!".

There was an explosion in the Dan furnace!

In the sky above the Dan furnace, there were crystal clear Dans, all of which were the size of fists, emitting extremely dazzling light and domineering!

"It's finally done!"

Bai Yu suddenly breathed a sigh of relief, he counted them, there were fifteen.

He counted the time, and it took about three hours, which already satisfied him.

Of course, the alchemy result was completely unexpected, he thought that ten was already the limit, but he didn't expect fifteen.

These fifteen pills are much stronger than the Guyuan Pill and Peiyuan Pill refined by Bai Yu, and they are not at the same level at all.

The level is already above the elixir, Bao Dan!

After all, these fifteen Five Elements Spiritual Qi Pills were refined from the spiritual power of heaven and earth, and there were no impurities.

Now the four people not far away were dumbfounded when they saw the fifteen pills coming out!

White Feather Alchemy lasted for three hours, and they didn't leave a single step, their eyes were all on Bai Yu and the Dan furnace.

They came from a secret realm, and naturally knew the power and energy contained in an elixir.

But Bai Yu was in front of their eyes, refining an extraordinarily powerful pill, it was simply a demon!

The cultivation of the sword is high, and he can also refine the pill, and such a talent has never been in the secret realm.

In the secret realm, although there are so many alchemists, they are nothing compared to the white feather in front of them.

If you can pull Bai Yu together, then in the secret realm, you will become a hegemon.

This is the most top-notch alchemist!

The expressions of the four people were extremely shocked, and they had already made up their minds in their hearts, that is, to win over Bai Yu.

Bai Yu stood up, and just as he was about to take the fifteen Spiritual Qi Pills into his pocket, suddenly there was a change in the air above the Spiritual Qi Pill......

A small dark cloud was spreading, and soon surrounded the Aura Pill.

Dark clouds are falling.

"Boom!"

At the same time, it was accompanied by a deafening thunder, and the dark clouds were mixed with the power of thunder and lightning.

"Dan Tribulation!"

Bai Yu was shocked in his heart, he didn't expect that there would be a Dan Tribulation!

He originally thought that there would be no Dan Tribulation, after all, these fifteen Spiritual Qi Pills were only Bao Dan, at least Dao Dan and above could produce Dan Tribulation!

There are six levels of pills, Ren Dan, Ling Dan, Bao Dan, Dao Dan, Xian Dan, and Shengdan.

The higher the level, the greater the power of the corresponding Dan Tribulation.

Only through the Dan Tribulation of the Dan Tribulation, the alchemy can be truly completed, otherwise it will be wiped out under the Dan Tribulation!

"What!" Shu Qingfeng's eyes widened, staring at the dark clouds in the sky.

"Dan Tribulation?"

Ao Gang was a little puzzled.

"This is the legendary Dan Tribulation!" Li Fenglan said.

"Only the best elixir can have a pill tribulation, I still heard my grandfather say it, this kind of best elixir has not appeared in the secret realm for hundreds of years!"

Yan Ruoyue's face was incredible.

In their eyes, there were very few alchemists in the secret realm, and alchemy could not be compared to Bai Yu at all, let alone refining an elixir that could trigger the Dan Tribulation!

I can't believe it.

At this moment, the thunderbolt has struck.

Fifteen thunderbolts came out frantically, and fell fiercely on the fifteen spiritual qi pills.

"Zila!

There was a screeching sound.

This thunderbolt did not have the slightest effect.

Dan Tribulation, there are a total of eight thunderbolts, and the power of each thunderbolt is increasing.

Bai Yu stood not far away, watching quietly.

He absolutely believed that the Dan he had refined would be able to withstand the Dan Tribulation, and if he couldn't even resist the Dan Tribulation, it would not be perfect.

What Bai Yu wants is definitely the most perfect, without any flaws.

At this time, it is already the second thunderbolt coming!

"Boom!"

The Reiki Pill is still intact.

Immediately after the third, fourth, and fifth, thunder and lightning descended at the same time.

The entire alchemy room was full of thunder and lightning.

"Bang!"

With a thud, an elixir was wiped out under the thunder and lightning.

Immediately after, the second and third disappeared under the thunder and lightning in turn!

And the last three thunderbolts.

The four of Shu Qingfeng couldn't help but sweat for the remaining aura pills.

And Bai Yu's face was calm, and there was no fluctuation at all.

The last three thunderbolts were slowly accumulating strength, and the terrifying power of heaven and earth shrouded the sky.

To their surprise, the three thunderbolts slowly merged into one.

Seeing this, the four of them couldn't help but gasp, thinking that they didn't know if they could resist it.

And what made them unbelievable was that the remaining twelve Spiritual Qi Pills were actually gathered together, surrounded by a ball, impenetrable.

They are spiritual!

It's just amazing!

At this time, the last thunderbolt is ready to go.

"This Dan Tribulation is really terrifying!"

Shu Qingfeng looked at the thunder and lightning and sighed involuntarily.

"Yes!" Li Fenglan nodded, "I don't know if I can survive the Dan Tribulation!"

"It should be hard to say. Yan Ruoyue said.

"Boom!"

With a loud bang.

The thunder and lightning scattered the surrounding aura pills, and the power of the thunder and lightning wrapped around the aura pills.

If you can resist the last thunder and lightning and not fly into ashes and annihilate it, then the Dan Tribulation will be over!

And now it's the last step.

Everyone's eyes converged on the front.

Bai Yu also looked ahead.

"Bang!"

An elixir can't bear it and turns into nothing!

Then there was another sound.

Another pill has come to naught!

Finally!

There was no movement anymore, and the tribulation had passed.

Of the fifteen Spiritual Qi Pills, only ten survived the Dan Tribulation safely.

With a wave of Bai Yu's hand, ten aura pills flew in front of him.

Dan has become!

Next, retreat......

(End of chapter)