The undead are hidden, the hub of the Soul Destroying Array.

Yang Yu's eyes flickered slightly, to be honest, he was not an indecisive person, but today in front of Du Fei, he was a little hesitant, because at this moment, he was also a little unsure whether this Du Fei was lying or not.

"Senior Brother Yang, you won't be frightened by this kid's words, no matter how powerful he is, will he still be able to jump in front of the two of us? If you kill him here, maybe it will be a great achievement!" Wu Hao stared at Du Fei and said with a sad voice.

Yang Yu's eyes flashed slightly, and after a while, he shook his head imperceptibly, although the possibility that Du Fei's words were true was not high, but he didn't want to take this risk, especially behind Du Fei, Biluo was still on one side, she could intervene at any time, making this already extremely troublesome situation more and more troublesome.

"Don't rush to kill him now, it's important to capture the treasure. Yang Yu's gaze froze on Du Fei for a moment, and then finally retracted, and then said lightly.

Hearing this, Wu Hao's face sank, and he wanted to say something more, but under Yang Yu's sweep, he swallowed the words back.

"Senior Brother asked you and me to come in first, not for this matter, but for the purpose of Rongtian Dan. Yang Yu spoke slowly again.

"Okay!When I get the Rongtian Pill, I want to see how he dies!?" Wu Hao glared at Du Fei fiercely, and then said with a slight gritted teeth.

And Yang Yu stared at Du Fei indifferently for a moment, but he didn't say anything more, but with a wave of his hand, he took Wu Hao's figure to the altar.

After flying to the altar, Yang Yu's figure quickly disappeared, but Wu Hao was standing on the edge, staring at Du Fei with an indifferent gaze, it was obvious that if Du Fei interfered at this moment, he would be desperate to make a move.

"They want to crack the formation and be the first to enter the main hall. Biluo stared at this scene and said lightly.

"What, do you want to spoil their good deeds?" Du Fei smiled when he saw this scene.

"What do you think? If they can crack this formation, maybe he will be able to control even the changes in this formation, and at that time, maybe they don't need to make a move, just with the power of the formation, they can kill the two of us. Biluo said lightly.

"This is indeed an extremely troublesome thing, but you and I don't have any clues to crack this formation at hand, since they have clues, they can only let them do it, right?" Du Fei spread his hands rather meaninglessly, "What's more, whether they can crack this formation or not is another matter!"

"Or, let's go up and have a look. After saying that, Du Fei waved his hand, and then jumped to the edge of the altar in Wu Hao's murderous sight.

Wu Hao's pupils shrank, and he was about to make a move, but when he saw that Biluo also followed, and neither of them made further movements, he slowly reined in.

Du Fei didn't pay much attention to Wu Hao's movements at this moment, but his eyes turned slightly, and he fell on Yang Yu, who was in the center of the altar at the moment.

At the top of this altar is a rather large platform, and in the center of the platform, there is a huge crystal ball suspended above it, and at this moment, Yang Yu's hands are constantly changing the imprint, and then one after another extremely thick pillars of true qi light roar out, and then it is poured into the crystal ball.

And with Yang Yu's movements, the huge crystal ball also slowly squirmed, and then, waves of extremely weird gray light continued to diffuse out of the crystal ball.

Yang Yu looked at this scene, but a trace of joy flashed in his eyes, it seems that the things that he had worked so hard to get with Luo Tong before were not useless.

With Yang Yu's movements, the crystal ball seemed to have been completely activated, and then it was seen that from the crystal ball, strange rays of light burst out, and finally intertwined together, forming a rather huge light array.

Du Fei's eyes narrowed slightly, and the soles of his feet instantly tightened, ready to make a move.

"Master, don't be in a hurry, this is not right, it seems that this formation is not used to open or protect this altar, but as if it is suppressing something. Master, you'd better be careful, I have a bad premonition. Xiao Bai's voice sounded in Du Fei's mind almost instantly, causing his movements to pause instantly.

Hearing this, Du Fei's eyes shrank, and after his gaze stayed on the formation in front of him for a moment, he waved his hand and signaled Bi Luo to retreat outside the altar, his figure suspended in mid-air.

"What's wrong?" Seeing Du Fei's movements, Bi Luo retreated, but apparently she hadn't noticed anything yet.

"The situation doesn't seem right, I estimate that this Yang Yu is unreliable. Du Fei said softly.

Hearing this, Bi Luo also nodded thoughtfully, although I don't know where this Yang Yu got this method of opening the Spirit Destroying Array, but if I look at it now, his method may not be right.

On the altar, Yang Yu frowned at the strange formation that appeared, his gaze kept shifting, but apart from the appearance of this formation, there were no other changes.

After squinting at the changes in front of him for a moment, Yang Yu hesitated for a moment before stepping forward, and then suddenly slapped his palm on the crystal ball.

"Click-"

With Yang Yu's palm falling, a Dao crack suddenly appeared on the crystal ball, and the light array that originally appeared was quietly running at this moment.

"Boom-"

And at the moment when this formation was running, the huge altar suddenly trembled violently, and faintly, cracks like spider webs cracked on the surrounding earth.

"What's going on?" In mid-air, Du Fei and Bi Luo glanced at each other, looking at this scene, their brows furrowed even tighter, this Yang Yu, this appearance is really cracking the formation?

And Yang Yu, who was on the altar, saw this scene, and after his face changed for a moment, he slapped a few palms in a row.

"Click-click-"

With his movements, a huge crack appeared on the crystal ball, and finally it collapsed directly and instantly, and with the collapse of the crystal ball, the huge altar also began to tremble wildly, and in this trembling, suddenly, there was a faint inky black breath, faintly leaking out of those cracks in the ground.

"Extraterrestrial Heavenly Demons!?"

Du Fei's pupils shrank sharply at this moment, but a little horror flashed on his face, he didn't expect that at this time, there would be the aura of an extraterritorial heavenly demon.

Could it be that under this altar, or rather, this Soul Destroying Array, and even the entire Undead Secret Vault, these extraterritorial heavenly demons are suppressed? Even, the entire undead realm will be unentered for thousands of years, just because this is the place to suppress extraterritorial heavenly demons?

If that's the case, it's likely to be a huge conspiracy.

Although Du Fei once faced the Ninth Heavenly Demon King of the Extraterritorial Heavenly Demons, witnessed his fall, and once killed the Heavenly Demon General Bai Yasha, but on those two occasions, one was when Emperor Xuan made a move, and the other was because of the power of the Yin and Yang Treasure Book.

Therefore, Du Fei knew very well how troublesome these extraterritorial heavenly demons were, if this was really the place where the extraterritorial heavenly demons were sealed, then this time, the trouble would be really big!

"It's actually an extraterritorial Heavenly Demon!?" As one of the owners of the Heaven and Earth Yuan Dan, Bi Luo obviously discovered something at this moment, and as soon as his complexion changed, he opened his mouth concentratingly. Obviously, she also knew about the troubles of these extraterritorial heavenly demons.

"The fool of the Taichu Jun Martial Sect!" Du Fei's eyes sank, he raised his head violently, stared at where Yang Yu was, and said sharply, "Yang Yu, are you cracking the formation, or do you want to let those suppressed extraterritorial heavenly demons come out?" If those things come out, don't talk about you, even if Jun Xuan is here, he will only be devoured!"

Hearing this, the faces of Yang Yu and Wu Hao changed, their eyes swept to the ground, and their complexions also changed unpredictably.

"Am I cracking the formation, it's not your turn to take care of this matter!" After the change in complexion instantly, Yang Yu glanced at Du Fei fiercely, and then gritted his teeth violently, and a palm was slapped out in an instant, and this palm directly blasted the crystal ball that was facing collapse into powder.

With the cracking of the crystal ball, the formation that had been suspended in mid-air also disappeared in an instant at this moment, and at the same time, the altar that originally vibrated with one finger also instantly regained its calm, and those heavenly demon breaths also converged at this moment.

Looking at this scene, Yang Yu glanced at Du Fei from afar, the taste in his words was self-evident, but even so, Du Fei saw a touch of happiness in the depths of his eyes.

And after Du Fei and Biluo glanced at each other, they also breathed a sigh of relief to each other, if the matter ends like this, then it will be a great luck.

However, just as everyone was slightly relieved, all of a sudden, an extremely evil aura instantly emerged from under the altar, and then surged out wildly.

"Boom-"

At this moment, the huge altar burst open, and the gravel instantly swept away in all directions, and then the rich inky black aura also swept out from the ground in an instant, and a terrifying evil aura that could not be imaged spread all over the world in an instant!

"It's a bit of a big problem now!"

After Du Fei and Biluo glanced at each other, they both smiled bitterly, only they, who were carrying the Heaven and Earth Yuan Dan, knew how troublesome and terrifying these extraterritorial heavenly demons were......