Working together, it took less than half an incense stick's worth of time to complete the formation.
Staring at the finished formation, Xia Xingchen's eyes lit up with delight. She had seen this stone hall's formation many times before, but this was by far the most powerful version she had ever witnessed.
There had been one occasion when the Sect Master had used two stone tokens to activate the formation, yet even that was not as formidable as the one before her now.
So Xia Xingchen turned to Chu Feng and said, "Kid, you really do have some skill."
She knew that the formation had been amplified to this level not because of the stone token in her hand, nor because of her.
It was because of Chu Feng.
If her stone token determined the formation's lower limit, then Chu Feng had determined its upper limit.
And he had pushed it to heights that the Azure Sky Immortal Sect had never achieved before.
"Senior, go ahead and cultivate in peace," Chu Feng said.
"Cultivate?" Upon hearing those words, Xia Xingchen was momentarily stunned, then she broke into a smile: "So it seems you really do understand this formation. You even know it can be used for more than just healing."
"Of course. I told you, I've already gained some understanding of this place."
When Chu Feng had obtained the Primordial Meditation Technique earlier, he had indeed also learned other information about the stone hall.
Although this stone hall had been built around the colossal gate connected to the Nine Heavens Secret Land, the hall itself also held treasures beyond dispute.
For example, the cultivation array that Chu Feng and Xia Xingchen had just activated was the second-best treasure within this stone hall.
As for the best treasure — that was the Primordial Meditation Technique that Chu Feng had already mastered.
The value of the Primordial Meditation Technique was such that even within the Seven Realms Sacred Palace, it would be classified as a forbidden treasure that could never be shared with outsiders.
And it would be of the highest tier among such treasures.
Moreover, the Primordial Meditation Technique within this stone hall could only be mastered by a single person.
Chu Feng was that person.
That was why he believed Xia Xingchen's claim that he was the first to have obtained the Primordial Meditation Technique.
Because if someone had acquired it before, Chu Feng would never have had this opportunity.
As for the cultivation array — unlike the Primordial Meditation Technique, which only one person could obtain — its usage was limited to a finite number of times.
Based on Chu Feng's observation and analysis of the formation, the power within it originated from artifacts. Those intricate marks on the hall's walls were the very source of the formation's energy.
However, as time had passed, the power within many of those marks had been completely drained.
Although the marks on the hall's walls still appeared densely packed, only three of them still contained usable power.
Just moments ago, Chu Feng had triggered the remaining energy within all three marks, which was why the cultivation array had become so overwhelmingly powerful.
And precisely because of that, this cultivation array would never be found here again.
Even bringing stone tokens would be useless.
After all, the formation's source had been completely exhausted.
"Well then, kid — I'll be troubling you," Xia Xingchen said, forming hand seals. A teleportation force began to manifest within the formation.
The moment the teleportation force faded, Xia Xingchen vanished, and the formation vanished with her.
The great hall returned to silence. Apart from Chu Feng and the intricate marks adorning the surrounding walls, there was nothing.
It was as if nothing had ever happened.
But Chu Feng knew that Xia Xingchen was now inside one of the marks within the hall.
That particular mark was one of the three that had powered the formation.
An outsider would never be able to tell which one it was, but Chu Feng knew exactly which mark she had entered.
If Chu Feng wished, he had the means to destroy that mark. And once the mark was destroyed, the formation would be destroyed along with it.
If the formation were destroyed, Xia Xingchen would inevitably suffer a devastating backlash.