The general structure of this abyss hall is very much like a huge mine cave, with many large and small openings in it, so Li Yuan doesn't know where Nangong Yi is, so he can only go down first with his intuition.

However, not long after leaving, Li Yuan saw that outside some caves, there was a mark of snowflakes, which undoubtedly should be the mark left by Nangong Yi, which means that Nangong Yi had already checked the past of these caves, so Li Yuan did not enter the entrance of the cave with the mark of snowflakes.

Then, Li Yuan spotted a hole without snowflake marks and hurriedly ran in.

There were a lot of books in this cave, Li Yuan took one casually, and after flipping through a few pages, he found that these books recorded some information about the Abyss Palace, such as high-level personnel information and some transaction accounts.

Even under Li Yuan's inspection, he also found transaction records with the Luo family.

Not only that, in addition to the Luo family, there are actually many unknown small families, all of whom have traded with the Abyss Palace, and if they bring these books and materials back, the Evil Suppression Division will be busy.

But it's a pity that there don't seem to be any clues about spies in this, and there are no clues about the Dark Moon God Sect, at least Li Yuan looked through it for more than half an hour, and basically didn't find anything.

"Did you find anything?"

Just when Li Yuan was seriously checking these books, Nangong Yi also happened to enter here.

"Teacher, not yet, but there are also many key clues in these books, such as that in addition to the Luo family, there are many small families who are also involved in the Abyss Palace."

"But it's a pity that I haven't found anything about the spy and the Dark Moon God Sect."

After Li Yuan saw Nangong Yi come in, he hurriedly explained.

"What can be easily placed on this bookshelf should be some ordinary information, and there must not be any clues about important spies and the Dark Moon God Sect."

"But these books also have a certain value, you can all receive them in the storage ring, and hand them over to Ling Hao when you go back, and let him lead people to exterminate these small families one by one."

Nangong Yi also opened a copy casually, shook his head slightly, and said.

"Okay."

After Li Yuan heard this, he immediately nodded, and then received the books stored in this cave into the storage ring in one go.

Since this was to be given to Captain Ling Hao, Li Yuan stored all these books in a low-level storage ring, and when he went back, he directly handed them over to Captain Ling Hao along with the low-level storage ring, so he didn't have to take them out again.

Subsequently, Nangong Yi left a snowflake mark in this cave, and then walked towards the entrance of the rest of the cave that was searched.

After about another hour or so, almost all the large and small holes in the Abyss Hall were found, and every single one

It was imprinted with a snowflake mark, which means that there are really no clues about the evil suppression division and the dark moon abyss here.

"In that case, let's go back."

Nangong Yi also decided not to stay here anymore, and was ready to take Li Yuan out of this Abyss Palace.

Although there is no clue to find out the spy, the news of the destruction of the Abyss Hall will definitely be known by the spy in the end, so he will inevitably be nervous, and when the time comes, Nangong Yi will find out him.

"Well, it's a pity I didn't find anything."

Li Yuan sighed slightly after accompanying Nangong Yi to find all the holes.

Then he didn't choose to stay any longer, anyway, he had already got all the valuable things, so he immediately followed Nangong Yi towards the exit.

But at this time, Li Yuan suddenly stopped, feeling that his right foot stepped on something.

Click! ~

Immediately after, the entire Abyss Hall began to shake.

"What's going on, teacher, I seem to have touched the mechanism."

Li Yuan instinctively retracted his right foot, and found that he had stepped on a strange white skull, and immediately remembered that when he entered the Abyss Palace, it seemed that the brown-haired woman had also crushed a similar white skull.

Nangong Yi, out of his protective nature of Li Yuan, brought Li Yuan to his side, and the Blue Moon Ice Sword in his hand immediately appeared to prevent the cave from collapsing, and to prepare strongly

Break through here.

But at this moment, Nangong Yi and Li Yuan found that there was no sign of collapse, but a crack in the ground, and a staircase leading to the ground also appeared.

"Chamber of Secrets!"

"I've found it, teacher, let's go in and have a look."

Li Yuan said excitedly after seeing the stairs appear.

Nangong Yi naturally understood what this was, and without saying a word, he took Li Yuan and walked in along the stairs.

This staircase was not very long, about twenty steps, and soon, Li Yuan and Nangong Yi saw a closed stone door.

This stone door is not very large, but there is also a small instrument next to the stone door, and this small instrument seems to need to be put in something to touch the mechanism and open this stone door.

"This should be the secret room of the Abyss Palace, maybe there are really key clues."

Although Nangong Yi didn't know what was in it, there was no doubt that this must be a secret room.

"You stand back, I'll force this way open."

"Hmm."

Hearing this, Li Yuan nodded slightly, and immediately took a few steps back.

Subsequently, the Blue Moon Ice Sword in Nangong Yi's hand also sounded a dragon groan, and a blue ice dragon phantom appeared behind him, but this time this stone gate was much smaller than the gate of the Abyss Hall just now, so the speed of breaking through was very fast.

Nangong Yi exerted himself

A blue sword qi was slashed forward, and the entire stone gate was frozen into ice on the spot, and then exploded in an instant.

After the stone door was broken, I don't know if it touched some mechanism, and at this time the alarm sounded, but since the Abyss Hall had been destroyed, even if an alarm sounded, it was meaningless.

Therefore, Nangong Yi and Li Yuan walked directly into the stone gate, and found that the space in the stone gate was very small, and there was nothing there, and it was very dim, only a stone table.

On top of the stone table was a black jade box, and on the wall was a mirror with black and gold rimmed.

"There's something weird here, don't move where you are, I'll go and take a look."

In order to prevent Li Yuan from being in danger, Nangong Yi let him stand where he was obediently, while he held the Blue Moon Ice Sword tightly and walked towards the stone table.

Then Nangong Yi's eyes looked at the black jade box on the stone table, and without the slightest hesitation, he directly opened it.

In the black jade box, there was a hexagonal black-purple gem, and the moment it was opened again, the alarm sound that was constantly sounding in the original Abyss Hall stopped strangely.

At the same time, in the black and gold-rimmed mirror on the wall, for some reason, a faint black gas began to emit, and these black gases became more and more, and in the originally calm mirror, fluctuations also began to appear, and a black humanoid phantom faintly appeared.