After passing through a broken mechanism with human traces, Zhao Yuan and Liam walked for about ten minutes, and the two finally came to a huge stone door.

This stone gate was not very large, it was only a little larger than the entrance to the fortress of the elves, and the distance between the three adults with their arms stretched was only about three feet high, and the texture was rough, which was very different from the smooth ground that had been walking all the way just now.

Although this stone gate looked ordinary, Zhao Yuan did not dare to underestimate it at all, he had already learned the strangeness of this stone gate from Liam's mouth.

When Liam came alone, he had taken the elixir to stimulate his potential, and his strength had doubled, but he had only opened a small crack in the stone door, and there was nothing he could do. Now that Zhao Yuan and Liam are coming, they are not completely sure, they just try their best.

The two of them looked at each other, then stretched out their hands against the door, their bodies were 75 degrees to the ground, their legs pressed on the ground, and began to try to open the door.

As soon as Zhao Yuanchu exerted his strength, he was shocked by the weight of this stone gate. He used seventy percent of his strength, but he couldn't make this stone gate move, and if it weren't for the fact in front of him, he couldn't believe it.

The two of them pushed for a long time, tried various angles and positions, and at most only let the stone door open a small crack, and then there was no more entry.

Both of them were exhausted, and they stood there panting with their hands on their hips, sweating profusely, their faces flushed, and they had obviously done their best.

"Well, it still doesn't work! what can I do?" said Liam, somewhat frustrated.

Zhao Yuan frowned, he was quite interested in the Quenching Pill, and he didn't want to give up so easily.

"Have you tried to break this stone door before?" he asked.

Liam replied without thinking about it: "Of course I tried, and my first reaction when I encountered these mechanisms was to smash them! Hey, it's a pity I don't need storage space here, otherwise I could have tried it with my hammer. ”

Listening to Liam's words, Zhao Yuan's thoughts fell into a dead end again, he walked into the stone door, rubbed his fingertips on it for a moment, turned his head and said, "Then do you and Mason know the material of this stone door?"

Liam still shook his head: "I don't know." ”

Zhao Yuan raised his eyebrows, pondered for a moment, and said, "This kind of extremely heavy and hard material, have you really never heard of it?"

"Hey!" Liam slapped his thigh and said with some annoyance: "I can't find any record of this thing, Mason has searched so many classics before, but I haven't found it, if you want me to say, this door is made of ordinary stone, anyway, I can't see the difference between it and ordinary stone!"

Liam's words hit Zhao Yuan like a spiritual light, he suddenly patted his head and said loudly: "Yes! You're right, Liam, this is an ordinary stone!"

Without waiting for Liam, who looked confused, to ask, Zhao Yuan quickly walked to the edge of the stone gate, stared at the stone gate with his eyes, and said, "Since you can't destroy this door with brute force, let's try using acid!"

After speaking, Zhao Yuan directly took off a ring on his hand, and carefully twisted the jewelry on the ring, revealing the soybean-sized liquid contained inside. This liquid was brown, and as soon as it encountered the air, it began to emit an indescribable smell, Zhao Yuan did not dare to delay, and immediately dripped it onto the stone gate.

Hearing the sound of "Zi!", the invulnerable stone gate was immediately corroded out of a small pit, Liam, who was watching from the side, stared at the small pit in disbelief, and asked, "What did you drop up, so powerful!"

Zhao Yuan smiled slightly, they also considered various situations when they came this time, just like Liam and his hands were full of rings, and there were bracelets on their wrists, just to be able to store more props. After all, underwater they don't have time to carry packages, and they can't put much in their clothes, so they can only stuff a little bit of each ring into their rings and try more.

And the aqua regia contained in this ring was what he improvised at the time to add it, but he didn't expect it to really work.

"Now there's a way to open this door, and I'll go up and take Mason and them next. Zhao Yuan said, Liam nodded, his eyes shone with excitement, but his body was a little tired and leaned against the stone door, and said, "Then I'll rest down for a while, I finally didn't come in vain!"

Zhao Yuan knew that his physical strength was definitely inferior to his own now, so he didn't say much, and walked briskly back down the stairs.

When he returned to the bottom of the cold pool where the water barrier was located, Zhao Yuan looked around, and randomly chose an open ground to start arranging the formation.

He unscrewed another ring, and at the same time pinched off one of the bracelets on his wrist, straightened it raw, dipped it in the powder stored in the ring, and began to draw intricate lines on the ground.

The task of this formation was originally assigned to Liam, but he was really careless and always misremembered, so Mason was not at ease, so he asked Zhao Yuan to replace Liam to set up this "Boundary-Breaking Teleportation Array".

Cracking the teleportation array is a very old teleportation array, and by now, it has been almost lost, its arrangement is not difficult, but the materials required are extremely expensive, Mason finally managed to get three copies, just to prepare for the failure of Liam's arrangement. And the people on the ground use a teleportation scroll, just to be able to teleport down the moment the teleportation array below is activated, and this teleportation scroll is even more priceless, there is only one!

After about an hour, Zhao Yuan set up the teleportation array, he wiped the sweat stains on his forehead, and exhaled heavily—this teleportation array was really complicated, if he hadn't had the ninth-order spiritual power as support, he really wouldn't have been able to complete the arrangement so quickly.

Mason told him before that Liam practiced arranging the teleportation array, often for a day, at that time he was still sighing that Liam was very hard and diligent, at that time Mason's expression seemed to be smiling, very subtle, now that I think about it, I am afraid that it took Liam a day to barely arrange the entire teleportation array!

Although this water is a forbidden demon realm, this almost lost magic array was invented for this situation. After arranging the magic circle, Zhao Yuan crushed the purple-red magic crystal in the center of the teleportation array according to what Mason said, and in an instant, a violent magic fluctuation erupted from the broken magic crystal, but it was quickly annihilated under the forbidden demon realm.

But this short moment was enough, and I saw the light of the teleportation array flash, and five figures appeared in the teleportation array out of thin air!

These five people were dressed very differently from Zhao Yuan, they were all wearing thick armor, and they were all carrying huge packages on their backs, eager to transform into humanoid storage bags.

"So fast, Your Excellency Zhao Yuan!" Mason said in surprise.

Zhao Yuan smiled and nodded, and said, "I asked you to configure the royal water belt before, right?"

Mason was stunned for a moment, and then a determined smile appeared on his face: "Of course, I have brought thousands of times more than all the items in the ring! I really didn't expect that this time it was this Wang Shui who made a meritorious service, Your Excellency Zhao Yuan, we must have another thank you after the matter is completed!"

Zhao Yuanchuan smiled and said: "Haha, it's not a big deal, just go back and invite me to drink a few more jars and three knives!"

The group laughed and followed Zhao Yuan towards the stone gate below, due to a lot of luggage, it was inevitably a little difficult in the narrow aisle, and everyone's speed was inevitably slower, and it took more than twice as long to travel as it originally took half an hour.

When everyone gradually arrived at their destination, Zhao Yuan was keenly aware of the slightest inappropriateness, he suddenly shook off the people who were still talking and laughing, took the lead and stepped down the stairs in a few steps, and rushed to the stone gate.

"What's the matter, Your Excellency Zhao Yuan?" Mason reacted the fastest, he immediately followed Zhao Yuan to Shimen, but saw that Zhao Yuan's face was extremely ugly, and he pursed his lips and looked at Shimen.

After a while, I saw Zhao Yuan glance around again, and then said word by word: "Liam, he's gone." ”

As soon as the words fell, the faces of the group behind him also changed greatly, this way is one way, if Liam goes up, they can't not meet it, the stone door is also tightly closed, there is no other exit in these four times, how can a good person suddenly disappear?

Mason, who has always been calm, also showed a shocked look, this ruin Liam is not the first time to come, there has never been an accident, and now the stone door has not been opened, where is the danger?

"Your Excellency Zhao Yuan, do you remember what Liam was doing before leaving?" Mason took a deep breath and said in a deep voice.

A look of surprise flashed in Zhao Yuan's eyes, and he replied, "He said that he was tired and wanted to rest underneath." ”

"Rest......" Mason muttered, and after a while, he suddenly raised his head, glanced at Zhao Yuan, and the two of them walked to the edge of the stone gate, squatted down together, and carefully looked at the ground next to the stone gate and the gap between the stone gate.

"Liam has always been informal, if he is tired, he will definitely sit down and rest, and it is not impossible to collapse on the ground. Mason said.

Zhao Yuan glanced at him and continued, "Before I left, I saw him leaning against the stone gate. ”

A sharp cold light flashed in Mason's eyes, and he said: "That's right, there is no problem with this ground, the problem is the thing behind the stone door, no matter what, open this stone door, and we can find the answer!"

Zhao Yuan nodded, so the six of them did not hesitate, they each took out a few bottles of sealed aqua regia, and immediately splashed it on the stone door after opening the cork.

Just listening to the sound of "zizi" sounding continuously, the stone gate was corroded in an instant, and the corroded place was smoking, emitting an unpleasant smell.

Zhao Yuan knew that this smoke was poisonous, but everyone present was a martial artist, so naturally he would not be afraid of this small poison.

In less than ten minutes, the impregnable stone door had been corroded into a huge hole, revealing a swarthy space on the façade. Zhao Yuan reluctantly probed with his spiritual power, and found that it was just an empty space, so he waved his hand to everyone and took the lead in entering the cave.