My skills are all passive.

Now this stone door is blocking Hao Yun. If he doesn't find a way to open it, he won't be able to enter the back, and he doesn't know what is inside.

If he was asked to leave in despair, Hao Yun would never agree.

After all, it took a lot of effort to find this underground palace, which means there must be some secret hidden inside, and maybe there will be new clues.

So immediately after, Hao Yun gathered his strength again and punched the stone wall again.

Just a muffled sound was heard, and the huge fist force was absorbed by the stone wall again. It still did not cause any damage, and there was not even any vibration in the surrounding passages.

From this point, Hao Yun discovered that this stone gate was not simply hard, but contained a strange power that could absorb and dissolve the power, so Hao Yun's attack had no effect at all.

Moreover, every time a critical strike is issued, it is a huge consumption of one's own energy, and it is impossible for Hao Yun to use most of his power on this.

Otherwise, when you leave the hall and encounter that kind of monster with strong defense again, you may not be able to escape smoothly.

As a result, Hao Yun was faced with an awkward choice: whether to continue looking for a way to open the stone door, or to just leave.

After all, after these two tests, Hao Yun has been able to determine that there is no way to forcefully break the stone gate by relying solely on his own strength.

"Asshole, can we just go back the way we came?"

Hao Yun looked at the stone door, frowning, thinking secretly in his heart.

If we return the same way, there is no use in staying in the secret realm. We can only return to the supernatural world, look for reinforcements, and conduct a carpet search of this secret realm.

It's just that this will delay at least nearly a month.

This is what Hao Yun doesn't want to happen. No matter what, he must take advantage of this opportunity to successfully find clues.

At this moment, Hao Yun suddenly had a bold idea in his mind, which was to use Xiaohong's sharpness to see if he could cut open the stone door.

If Xiaohong can be used to create a gap, perhaps using a critical strike, it will be effective.

Hao Yun never wastes time. Now that he had this idea, he naturally did not hesitate and directly pulled Xiaohong out of his waist, used the energy in his body, and slashed at the stone door.

Zheng!

A sound of metal and stone colliding was heard, and Hao Yun was immediately forced to take two steps back by the huge force of the shock, and his hands felt numb.

But looking at the position on the stone gate where he attacked, there were no traces, not even a white mark.

This shows that the material of Shimen is harder than Xiaohong.

The last resort still had no effect, and Hao Yun's heart gradually became cold. It seemed that there was only one option left, which was to leave this underground palace and return to the secret realm above.

Although I felt a sense of regret about leaving empty-handed, there was nothing I could do about it.

So after sighing heavily, Hao Yun turned to Nannan and shouted: "Let's go up."

"Go up now... aren't you looking for other agencies?" Nan Nan also looked a little surprised when he heard this, as if he didn't expect Hao Yun to give up so quickly.

After all, after getting along with each other for a short period of time, Nan Nan also understood a little bit about Hao Yun's character and knew that he had no fear at all in the face of difficulties.

That's why I had the courage to ask such a question.

Hao Yun didn't think too much about this and said directly: "There is no way to open this stone door. There is no point in staying here. Let's talk about it first."

The main reason is that Hao Yun has used up all his methods. If he uses the God-Destroying Gun to attack, it will most likely cause the bullet to rebound. Even if he doesn't have to worry, it will be bad if he hurts Nannan.

In fact, Nan Nan prefers to take the underground passage, because a huge sect like this will definitely have an escape route, and may be able to leave the secret realm safely underground.

This way they can all be safe.

Otherwise, once you return to the top, you are likely to be attacked by monsters, and the situation will become more troublesome.

So Nan Nan spoke again: "I seem to have heard my family mention this style of stone door before. As long as I send energy to it, it should be able to open."

"Transmitting energy?"

When Hao Yun heard this, he was stunned. He didn't know whether what Nan Nan said was reliable.

But there doesn't seem to be any other good solution now. Trying it according to Nannan's suggestion doesn't seem to have any impact.

Besides, Hao Yun was indeed a little unwilling to leave like this.

Thinking of this, he simply walked towards the stone door again, pressed his hands on the stone door, and mobilized the energy in the superpower core to transfer it to the stone door.

But what Hao Yun didn't expect was that the moment the energy entered the stone gate, it immediately seemed like a stone sinking into the sea, and there was even a feeling of energy being sucked back.

Hao Yun was so frightened that he quickly cut off contact.

Otherwise, if you delay for a while, at least half of the energy in the core will be absorbed.

"Is it because my energy is different from the one here?"

Thinking that the supernatural energy in his core is different from the aura of this world, Hao Yun couldn't help but have such a question in his mind.

Just as Hao Yun was hesitating whether to give it a try, Nan Nan next to him said, "Let me try it."

As he spoke, he pressed his hands on the stone door.

Nannan's strength was not strong, so the power she could call upon was also quite weak. In just a few seconds, fine beads of sweat appeared on her forehead, and her body trembled slightly, as if she had reached her limit.

Just when Hao Yun was about to take it down, he unexpectedly discovered that a ray of light appeared on the stone door, and many mysterious patterns emerged.

Finally, it slowly rose, revealing the passage behind.

"Success!"

Nannan, who looked a little pale, was also full of surprise after seeing this scene, and turned her head to look at Hao Yun and shouted hurriedly.

It must be said that Hao Yun did not expect that she, an underage girl with such low strength, could successfully open this stone door, which was a pleasant surprise.

Fortunately, she was lucky, unlike Lin Dongguo Xiaohu and others, who died as soon as they entered the secret realm.

Otherwise, Hao Yun really had no way to open this stone door.

However, Hao Yun did not move forward immediately, but asked Nannan to take a pill brought from the front hall, and wait for her to recover a little strength before continuing to move forward.

After all, Nan Nan was so weak because she was trying to open the stone door. If she continued to move immediately, she would inevitably be overwhelmed.

Besides, no one knew if there would be any other places that needed Nan Nan's help later.