You don't want your secret to be revealed by others, right?

Night fell.

After Lin Yue stepped out of the cultivation chamber, he soared straight into the sky, ascending above the Prince Mansion. As the master of the mansion's array, the barrier naturally did not impede him.

The night breeze was gentle as he hovered several hundred feet above the Prince Mansion, glancing down at the estate. With a quick motion, he produced a broken sword.

This was the token to enter among the Upper Three Cave Heavens within the Thirty-Six Holes.

Back in the First Middle Cave Heaven, the spirit of that heaven had specially gifted it to him.

"Open."

Lin Yue immediately infused primordial power, activating the token of the broken sword.

In the next moment, a vast and boundless invisible force suddenly descended, enveloping him and shortly causing his surroundings to change as space was teleported.

When his vision returned to normal, Lin Yue found himself on a tremendously vast bluestone platform, spanning thousands of feet in all directions, surrounded by endless white mist.

At the platform's edge stood a stele, a hundred feet tall and dozens of feet wide, inscribed densely with large characters.

At that moment, humanoid silhouettes condensed from nothing into tangible forms, a full ten figures, each clad in black royal robes, floating in midair.

"Hmm?" Lin Yue scanned the figures, feeling somewhat surprised.

These individuals in black royal robes, he had nearly all seen in Xiahou Shou's memories, they were the titled kings of Great Yu!

Only... from their aura, they were clearly all spirits of the Cave Heaven.

"Are you the spirits of the Cave Heaven?"

Lin Yue tentatively asked, "Why are you all wearing royal robes?"

A kind-faced titled king smiled and replied, "Though we are spirits of the Cave Heaven, we also possess the memories of the ten titled kings. You may regard us as the kings themselves."

"We need not exchange many words with him."

Another titled king with a stern expression scrutinized Lin Yue, "Great Yong has managed to send another inside, and a member of the Xia Hong Imperial Family... Are you a prince?"

"Seventeenth Prince," Lin Yue replied with a courteous nod.

He had long heard from the spirit of the First Middle Cave Heaven that four individuals from Great Yong had entered before: the Third Prince, the Fifth Prince, the Eldest Princess, and the Second Princess.

Only those with astonishing talent could receive the token to the Upper Cave Heaven after entering a Middle Cave Heaven, and indeed, these four were all peerless prodigies, currently likely powerful cultivators who had reached perfect proving.

"Hm, since you're not of our Great Yu's Imperial Family, by virtue of being a human clan's astonishing talent, we will afford you an opportunity to attempt the trial."

A titled king declared coldly, "This is the Third Upper Cave Heaven. You may only proceed to the next Cave Heaven after passing its trial. If you cannot accomplish this, leave swiftly as you are unworthy of Great Yu's benefits."

Lin Yue calmly asked, "What is the content of the trial?"

"Do you see that stele?"

The stern titled king pointed at it and explained, "Inscribed on the stele is a unique primordial spirit cultivation method. Once cultivated successfully, your primordial spirit will emit a peculiar aura that draws mutant beasts. The deeper your cultivation, the wider the aura's range, and the higher the level of beasts attracted."

Mutant beasts?

Lin Yue raised an eyebrow slightly.

"Of course, cultivating this method tests not only your comprehension and talent but also heavily relies on your Dao Heart Will, or to put it differently... your endurance!"

A female titled king smiled and reminded, "Once you start cultivating this primordial spirit method, it will cause great pain. It continuously tempers your primordial spirit. If your Dao Heart Will is insufficient, and you cannot endure the pain, then there will be trouble."

"Oh?" Lin Yue's eyes lit up.

The primordial spirit stage of the Three Thousand Hell Body also tempered the Dao Heart through excruciating pain.

However, the pain it inflicted had long ceased to be effective for him.

Perhaps this method could further refine his Dao Heart Will?

"The cultivation method is the first challenge, and there is a second. Look at the white mist surrounding the platform."

The stern man gestured at the vast mist and said, "The mist is home to many mutant beasts. Once you start cultivating this method, the aura you emit will attract a horde of beasts to attack you, and your task is to endure the pain, continue cultivating, and survive the beast assault until you successfully complete the method."

Lin Yue realized.

No wonder, if it were just cultivating the method, this trial would be too simple.

It meant that the trial required not only enduring the pain and cultivating the method to completion but also dealing with the beasts drawn by the aura under the influence of the pain?

"From your life aura, it appears you are currently twenty-five years old."

An elderly titled king assessed Lin Yue and remarked, "Therefore, under the assault of mutant beasts, as long as you cultivate the method to the fourth layer, you will pass the trial of the Third Upper Cave Heaven. If you cannot persevere, you may give up and discontinue the trial at any time. However, once you quit, we will send you out of this Upper Cave Heaven."

The stern man pointedly added, "Cultivating to the fourth layer is merely the minimum requirement to pass the trial, allowing you to proceed to the Second Cave Heaven, but without any additional rewards."

"Understood."

Lin Yue nodded slightly and then turned his attention to the inscriptions on the vast stele.

This primordial spirit cultivation method was named "Nine-colored Beast Breath," comprised of nine layers.

He only needed to cultivate to the fourth layer to pass?

From Xiahou Shou's memories, many great cultivators attempted the trials of the Upper Three Cave Heavens during the Great Yu Period.

Xiahou Shou had planned to try after mastering his cultivation, aiming for better rewards, but met his demise before reaching the Upper Cave Heavens.