Chen Yang gave Han Li and Gu Qianxun a look, then turned around and walked into the door.

Han Li and Gu Qianxun exchanged a glance and followed.

The space inside the secret vault was not small, comparable to a palace. Seven or eight tall cabinets, made of a dark black wood, were placed inside.

This wood did not seem to be ordinary, emitting a faint fragrance that filled the entire secret vault.

Each cabinet had three layers, and each layer was filled with many boxes and wooden containers, containing various precious materials, cultivation method books, beast cores, and so on.

Han Li ignored the cabinets and looked directly at the center of the secret vault.

There was an open space there, with a black stone pillar more than one person tall standing in the middle, engraved with earthworm-like patterns.

At the top of the stone pillar was a human head-sized black crystal.

This crystal was as smooth as a mirror, emitting a bright black light that rippled outwards like black water. Within the black light, a strange energy fluctuation could be felt.

As soon as Han Li entered the secret vault, the Black Tribulation Insects in his body touched this strange energy and immediately stopped moving completely, falling into an even deeper sleep.

"Black Tribulation Stone!"

Han Li's heart stirred, but he glanced at Chen Yang beside him and did not immediately reach out to take it.

Gu Qianxun also looked at the black crystal, and a hint of surprise flashed in her originally cold and beautiful eyes.

"Fellow Daoist Li also knows about the Black Tribulation Stone? However, this object can only suppress the Black Tribulation Insects and cannot remove them. Let's quickly look around to see if we can find a way to remove the Black Tribulation Insects. Also, please forgive the two fellow Daoists, but the situation outside is changing rapidly, and we cannot delay here for too long, at most half an hour." Chen Yang seemed to have seen what Han Li and Gu Qianxun were thinking and said.

Gu Qianxun nodded in agreement and walked to a cabinet to start searching.

Upon hearing this, Han Li also retracted his gaze and began to search around.

Magic energy and immortal spiritual power could not be used within the Jilin Void Realm. Although this place was a secret vault, there were basically no restrictions or the like.

The three searched quickly and soon searched the entire secret vault.

After an incense stick of time, Han Li put down a book, his face a little ugly, and looked at Gu Qianxun beside him.

Gu Qianxun also looked over at this time, her face somewhat solemn.

The two of them did not trust Chen Yang, so they tacitly took over the search work for all the books, asking Chen Yang to search for other items.

However, after the two of them had read all the books, they did not see the words "Black Tribulation Insect" even once.

"I have found some useful information here. The two fellow Daoists can come and take a look." At this moment, Chen Yang's voice came.

Han Li and Gu Qianxun heard this and quickly walked over.

Chen Yang was now standing in front of a cabinet in a corner. On the cabinet was a foot-sized black crystal box. Through the translucent box wall, one could clearly see black centipede-like insects lying inside, which were the Black Tribulation Insects.

In his hand he held a piece of black jade, the same texture as the crystal box, seemingly a part of the crystal box, on which were written lines of dense small characters.

Chen Yang handed the black jade tablet to the two of them, and Han Li and Gu Qianxun read it quickly.

Before long, both of their faces darkened.

The jade tablet described the method of cultivating the Black Tribulation Insects, from birth to what to feed them to grow up, and how to implant them into the human body, all recorded in great detail, but there was nothing written about how to remove them.

However, the jade tablet mentioned the Black Tribulation Stone. The Black Tribulation Insects were a group species, and each Black Tribulation Insect swarm had a queen that commanded the other Black Tribulation Insects.

The Black Tribulation Stone was a special crystalline substance formed by using secret techniques to condense the corpse of the Black Tribulation Insect Queen, so it had the effect of suppressing the Black Tribulation Insects.

To suppress a Black Tribulation Insect, it was enough to carry a fingernail-sized Black Tribulation Stone on one's body.

"The two Black Tribulation Stones, the two fellow Daoists should keep them well and wear them on your bodies first to suppress the Black Tribulation Insects." While the two were reading the contents of the jade tablet, Chen Yang walked to the Black Tribulation Stone and chopped off two egg-sized black crystals, handing them to Han Li and Gu Qianxun.

"According to what is said above, it seems that such a large piece is not needed," Han Li said.

"Although it says so above, it is always safer to have more," Chen Yang said with a laugh.

"In that case, thank you Fellow Daoist Chen Yang." Han Li was not polite, thanked him, and put the Black Tribulation Stone close to his body.

Gu Qianxun also kept the Black Tribulation Stone, but her gaze remained on the black crystal box.

"Fellow Daoist Gu wants to take some Black Tribulation Insects? Please take them as you please, but you must use special containers to hold these insects," Chen Yang said, seeing Gu Qianxun's gaze.

"Without a large Black Tribulation Stone, these Black Tribulation Insects are useless. Look here." Gu Qianxun shook her head and pointed to the side of the black crystal box.

That happened to be Han Li's blind spot. Han Li walked to Gu Qianxun's side and saw what she was pointing at.

There was a six-petal flower pattern engraved on the crystal box, which was quite exquisite and seemed to be some kind of mark.

This pattern was engraved very shallowly and was difficult to see without careful observation.

"Fellow Daoist Gu recognizes this pattern?" Han Li asked with a focused gaze.

This pattern was engraved on this black crystal box and should not be without reason.

"Before I came to Qingyang City, I once saw this pattern in Xuan City. It is the unique mark of a sword-casting master, Madam Liu Hua," Gu Qianxun said slowly.

"Madam Liu Hua? It sounds like a woman. Female sword-casting masters are rare," Han Li said, stroking his chin.

"I have also heard of Madam Liu Hua's name. She is not a woman. There is a clan in the Holy Region called Baiyi, which is skilled in sword-casting and weapon-refining. The person with the highest refining skill in each generation can receive the title of 'Madam'. Senior Liu Hua is the madam of the Baiyi clan in this generation. Millions of years ago, for some unknown reason, he was thrown into the Jilin Void Realm. These years, he has been living in the main city of Xuan City. The weapons he refines are all high-quality goods, difficult to obtain even with a lot of money. Du Qingyang wanted to ask him for a handy weapon back then, but he did not succeed," Chen Yang shook his head and said.

"So that's how it is. It's just that Madam Liu Hua's mark, how could it appear on this box?" Han Li said with some confusion upon hearing this.

"It seems that this box was made by Madam Liu Hua, or does she have something to do with these Black Tribulation Insects?" Gu Qianxun frowned and muttered.

"There is still a little bit of the secret vault that has not been searched. Let's finish searching first," Chen Yang suddenly interjected.

Han Li raised his head and looked forward. There was only one last cabinet left to explore, but this cabinet was filled with various materials and miscellaneous items.

Although the hope was slim, the three of them still worked together to carefully search this last cabinet.

Han Li picked up a fluorescent purple-black crystal stone, carefully probed it with his spiritual sense, and found nothing hidden inside, so he put it down and picked up another item next to it.

"Eh!" Han Li's expression changed slightly.

This item was a palm-sized black relief, carved with a three-headed, six-armed demon god, sitting there in a strange posture.

He had seen this thing before. There was also such a black relief in the storage magic weapon of Zhaogu True Man.

The two reliefs were exactly the same in size and materials used. The only difference was the posture of the two demon god statues.

"Could it be that these two statues have some connection?" Han Li secretly guessed, and looked at Chen Yang and Gu Qianxun. Both of them were exploring other things and did not notice the situation on his side.

A flash of crystal light shot out from between his eyebrows and entered the relief.

The black relief vibrated slightly, and then it came to life, dancing its hands and feet, making various poses, a total of twelve, and after each pose, many unrecognizable strange characters appeared behind the relief.

However, the twelve poses of this relief were completely different from the relief of Zhaogu True Man, and Han Li could see that these strange characters were also different from the previous ones, although he did not recognize them.

A hint of joy flashed in Han Li's eyes. This relief was indeed greatly related to the relief of Zhaogu True Man, and seemed to be a set of things.

He casually flipped through the black relief twice, and quickly put it back in place as if nothing had happened.

The three of them quickly searched all the items on this cabinet, and as expected, there were no seemingly valuable gains.

The only valuable information found in this secret vault was the black jade tablet. So the three gathered again at the black jade box.

"No matter what, this can be considered a clue." Han Li said thoughtfully, looking at the Liu Hua mark on the jade box.

Gu Qianxun did not speak, but just looked at Chen Yang.

"I'm really sorry that I couldn't find a way to remove the Black Tribulation Insects for you. But after I clear out Du Qingyang's remnants, I will definitely send more people to continue the investigation and give you two a satisfactory answer." Chen Yang showed a look of shame.

"A satisfactory answer? Does Fellow Daoist Chen Yang mean to guarantee that you will find a way to remove the Black Tribulation Insects? I don't know when that will be?" Han Li frowned slightly at this time, and then asked faintly.

"Only Du Qingyang knows the method to remove the Black Tribulation Insects. Now that he is dead, Chen will try his best to continue searching in the City Lord's Mansion and other places, and at the same time, he will try to inquire about news from Xuan City, and he should be able to find it," Chen Yang said quickly.

"Should be able to find it? Fellow Daoist Chen, please spare us this kind of perfunctory talk. Regarding the Black Tribulation Insect issue, please give us a definite explanation," Gu Qianxun said with a cold tone.

"It seems that the two of you have already joined forces and don't plan to continue cooperating with Chen?" Chen Yang looked at Han Li and Gu Qianxun, a cold light flashed in his eyes, and his tone became cold.

A flash of white light appeared on his left arm, and a layer of crystal clear white faintly appeared on his skin. An extremely huge and fierce aura suddenly erupted, pressing down on the two of them.

This aura was extremely huge, not inferior to the previous Du Qingyang, and it was extremely fierce. The nearby void seemed to be cut by countless extremely sharp forces, buzzing and vibrating.

Han Li and Gu Qianxun's bodies seemed to be pressed down by a ten-thousand-zhang giant peak, sinking for a moment, but the expressions on their faces did not change at all. They immediately released their own auras, joined together, and actually resisted Chen Yang's pressure.

The three huge auras intertwined, and faint flickering sparks appeared in the void. The entire secret vault shook gently.