I am cultivating immortality live in the prehistoric times

A certain mountain range in the eastern part of the prehistoric land.

Bi Yun was currently floating in the sky above the innate formation, with a look of surprise on his face.

Because the formation skill has been upgraded to the proficiency level.

He could already see the true appearance of this innate formation.

All he saw was blocking his way forward.

It turned out to be a colorless and invisible formation of light and shadow.

And behind this formation, there is an extremely dark and bottomless cave!

Obviously, the source that can attract the power of Hunyuan in his body is exactly in this cave!

However, after coming back to his senses, Bi Yun's face was full of bitterness.

Because he discovered that even if he upgraded the formation to mastery, he could only see the true face of the formation.

And can't find any flaws in this formation!

This is a bit painful!

After thinking about it, Bi Yun gritted his teeth as he looked at the dark cave in front of him.

Then continue to improve the level of the formation method!

Anyway, everyone can become a saint, and the formations and avenues also have a great effect!

Maybe one day I can compete with Tongtian on my formation skills!

Thinking of this, he no longer hesitated.

He directly said to the system in his heart:"System! Raise the [Way of Formation] to another level!" As soon as he finished speaking, the system's beep sounded!

"Ding dong! To upgrade [The Way of Formation] to the next level [Control], 5 million popularity points are required"

"The current popularity value is still 9.5 million, will it increase?

Bi Yun nodded directly:"Yes!""

"Ding dong! Consumed 5 million popularity points and successfully improved [The Way of Formation]!"

"The current level of skill [Way of Formation] is [Control]】"

"Ding dong! To upgrade to the next level [Master], 10 million popularity points are required"

"The current popularity value is still 9.5 million, will it increase?"

After the prompt sounded, Bi Yun flawlessly paid attention to him.

Because at this time he had entered an extremely mysterious state of mind.

Every minute and every second, he felt that there were countless formation knowledge flying in his mind. It passed by, and was digested by him in an instant, and he used it for his own purposes.

This state also made his understanding of the art of battle continue to improve one day later!...

Bi Yun finally opened his eyes and woke up from his mental state!

His deep black eyes were constantly flashing with runes of light and shadow, and formations and Tao Yun appeared faintly around him!

This is the embodiment of understanding and mastering the Dao of Formation.

After Bi Yun regained consciousness, he had no intention of procrastinating.

His eyes immediately turned to the innate formation in front of him.

At this time, he finally discovered something different.

The light and shadow of the formation that was still invisible and colorless at first was actually flowing with countless formation runes.

This is the true face of this innate formation.

Of course, if Bi Yun's formation attainments reach a higher level, he will see more than this.

However, being able to see the flow of these runes means that we can deduce the flow, combination, and superposition of these runes....So study how to break this formation!

Thinking of this, Bi Yun didn't hesitate at all.

Start sitting cross-legged and deduce this formation..........

A year has passed.

He performed three out of ten...

There are still too many question marks.........

Ten years have passed.

He performed six out of ten...

Still confused.........

Soon, twenty years passed by.

He finally stopped the deduction...

"That's it!"

Bi Yun murmured to himself, his eyes flashed, and he stepped forward directly in the next second!

What's strange is that when he took this step, it was as if he had crossed the gap in the formation.

There was no light or shadow to stop him.!

Stepped into this innate formation very smoothly!

"Twenty years!"

"It’s really not easy!"

Bi Yun sighed in his heart!

Then he felt that the power of Hunyuan in his body was still pulling him behind.

No longer staying, he flew directly towards the bottomless cave ahead!

In order to be conservative, he sacrificed Bi Yunjian and Xuanyi were carrying Yang Lingzhu on their heads to prevent any accidents!

What surprised him was that the cave was so deep that even if he flew for a while, he still couldn't see the end. Pulled by the force, he couldn't help but speed up and fly forward!

Finally, after half a stick of incense, he saw something unusual!.

But a kind of natural fluorite glowed, making the place no longer so dark.

What surprised Bi Yun even more was that a pool with a radius of ten feet appeared in front of him! With the rich spiritual energy, Bi Yun suddenly discovered that this pool was actually condensed with rich spiritual liquid!

And next to this spiritual pool, there was a big tree that was three feet tall and shaped like a peach tree, and there was a tree under the tree. There is a colorful dome...

"This is...Enlightenment tree?"

"Phoenix egg?"

After seeing the scene in front of him clearly, Bi Yun couldn't help but exclaimed!.......