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Although the black star vine needs to parasitize on the bodies of other creatures, this thing also has metacrystals in its body. Jiang Feng and the others found some, but others didn't. In this case, there can only be one possibility, that is, the disappearance of the metacrystal, which is related to the previous person.

Although Jiang Feng didn't see that person take away the Yuan Crystal, he saw that person make a move on the Black Star Vine and suck something away. This made Jiang Feng feel that that person must have something to do with the disappearance of the Yuan Crystal.

In any case, some of the metacrystals have disappeared, and it is useless to be angry. After working hard to kill hundreds of monsters, but only getting less than eighty yuan crystals, Jiang Feng's depression is naturally conceivable.

Aside from the metacrystals, no magic cards were found. Jiang Feng was not surprised by this. Because he knew that something like the Black Star Vine, unless it was a high-level storage zài, otherwise, there would be no magic cards.

There are a total of seventy-six Yuan crystals, of which there are eleven black iron first-order and six black iron second-order. When he saw the six black iron second-order yuan crystals, Jiang Feng's mood was finally better.

For people with the strength of the first order of black iron, the yuan crystals of the second order of black iron are equivalent to ten yuan crystals of the first order of black iron. However, for Jiang Feng, whose strength was already a second-order black iron, the second-order Yuan Crystal of black iron, in the best case, could only strengthen his body by a factor of 0.6. Six black iron second-order yuan crystals were not enough for Jiang Feng's strength to be raised to the third order of black iron.

"It's better to slash him with a knife just now, so that not only can I get hundreds of Yuan Crystals, but I can also get a Black Iron Third-Order Yuan Crystal, which is enough for me to strengthen to the Black Iron Third Order." Jiang Feng thought in his heart.

"Strange, why don't you have a card? Doesn't this monster drop cards? Zhang Haitao said with some doubts.

Looking at Zhang Haitao, who really regarded this as a monster and lost equipment, Jiang Feng said: "Okay, don't think about it so much." Let's quickly divide the metacrystals and then go to other things. I'm not welcome to these second-order Yuan Crystals of Black Iron, and the rest of us will be divided equally among the three of us. ”

No one has an opinion, after all, the monster Jiang Feng killed the most, without Jiang Feng, Huang Xiaoyue and Zhang Haitao would not have survived, so they naturally would not have any opinions.

After dividing the Yuan Crystal, Jiang Feng looked at the clinic on the second floor. After a few seconds, he said, "The Yuan Crystal in the hands of the two of you should be able to raise the strength of the two of you by one level." But now I'm not busy with the promotion, let me go upstairs first and see why so many monsters are gathered on the second floor. ”

The three of them walked together towards the stairs leading to the second floor, each careful. Especially after going up to the second floor, everyone is even more cautious.

Since the monster jumped out of the window, the windows on the second floor were all shattered, and it was possible to see inside the room. Every time they walked through a room, Jiang Feng and the three of them looked carefully. After making sure that there were no monsters in it, and nothing special, I moved on.

Soon came to the window of the clinic, and when I looked inside, I didn't see anything alive except for the mess inside the clinic.

Jiang Feng didn't immediately go into the room, but continued to walk forward, and only after making sure that there were no monsters in the other houses, did he return to the door of the clinic.

It is a dental clinic and is very small. There are only three rooms inside and out. When Jiang Feng entered the room on the far left, he noticed that this room was different.

"How is there a hole here? Could it be that the house has been collapsed by a monster? Zhang Haitao, who came in, said.

In the floor of this room, which was clearly used for resting, there was a hole. Inside this cave you can see a stone staircase that goes diagonally downward, but you can't see the way to it.

"There are stairs in the cave, could it be a shelter built for himself by the owner here?" Huang Xiaoyue said analytically.

"It's impossible, this is the second floor, and if you want to build a shelter, you can't make a staircase on the second floor. Isn't it more convenient to get it on the first floor? Zhang Haitao said.

Jiang Feng had already squatted down and was touching the stone steps inside the cave. Judging from the material of the stone steps, it is completely different from the material used in the building. And the stone steps are all dusty, indicating that it has not been used for a long time.

"Let's go down and have a look." Jiang Feng said, and walked down first. Flames also appeared on his hands, which were used for lighting.

The stone steps were obliquely downward, and Jiang Feng walked down step by step, walking more than fifty steps before he reached the end of the stone steps. At this time, Jiang Feng and the three of them came to a small room of only a dozen square meters. The walls and floors of this room are all made of stone. And looking at the appearance of the stone, it should be the same as the stone of the stone steps.

Directly opposite Jiang Feng and them, there was a closed stone door. The moment he saw this stone gate, Jiang Feng knew what kind of place this was.

"Ruins, there's a ruin here." Jiang Feng said in his heart. His mood began to get excited.

Since the moment the monster appeared, there have been many ruins on Earth that had not been discovered before. These relics are not left by people for thousands of years, but by more ancient civilizations. Among these ruins, there are also a large number of treasures. Every time a relic is discovered, it will bring a lot of benefits to mankind.

The appearance of these ruins is also strange. Where there is nothing at all, a ruin may pop up. It's as if the ruins suddenly rose from the ground, or fell straight from the sky.

Now Jiang Feng somewhat understood why the stone steps led to the second floor. Presumably, after the appearance of this ruin, because it was too close to the ground, the passage passed through the first floor and ran up to the second floor.

"Be careful, everyone, there's likely to be a monster behind the door." Jiang Feng said as he leaned towards the stone gate.

After approaching the door, Jiang Feng put his ear to the door and listened carefully. He didn't hear anything. Then he reached out and pushed the stone door, but the stone door did not move.

"Let me try." Zhang Haitao walked up.

He pushed, but he still couldn't push. Even Jiang Feng pushed it with him, but he couldn't open this stone door. And there is no decoration on the stone door, so it is impossible to tell whether it is sealed or not.

"Why don't I try and see if I can smash open this stone door?" Zhang Haitao asked.

Jiang Feng thought about it and felt that this might be a solution. He nodded, and stepped back. Zhang Haitao also took out his big hammer. After rounding the hammer, he threw it towards the stone door.

After a muffled bang, the stone gate still didn't move, Zhang Haitao's sledgehammer had been bounced out, and even he himself took two steps back. As soon as he was on his feet, he put away his hammer and took his trembling right hand with his left hand.

"Why is it so hard? My hands were about to break when I was shocked. Zhang Haitao said.

Jiang Feng looked at the stone gate, and he found that there was not even a single scar on the stone door. You must know that Zhang Haitao's hammer is not an ordinary hammer, with all his strength, the wall can be penetrated, but this stone gate is nothing at all.

After thinking about it, Jiang Feng took out his knife and slashed down. It's just that he didn't cut the stone gate, but the ground under his feet. After a knife, Jiang Feng walked to the stone steps and also gave the stone steps a knife.

Whether it was the ground or the stone steps, after Jiang Feng's sword, they were not damaged. Now Jiang Feng didn't have to try to cut the door, he knew that his knife couldn't break through the door.

"No wonder there's a passage." Jiang Feng said in a low voice.

The stone here is as hard as iron. According to Jiang Feng's analysis, it was impossible to enter from other places except for that passage. And now, they can't enter the stone gate at all.

"I can't get in, what happens to my equipment? Is it just like that? Jiang Feng muttered in his heart.

The stone door can't be opened, so I can only find another way. But no matter what Jiang Feng thought, he couldn't think of any way. At this time, Huang Xiaoyue approached the stone door, she stared at the stone door carefully, and after a while, she touched the edge of the stone door with her hands, and then went to blow the crack of the door, blowing off the dust there, and completely exposing the crack of the door two or three millimeters wide.

"Look here?" Huang Xiaoyue shouted.

Jiang Feng and Zhang Haitao hurried over. Following where Huang Xiaoyue pointed, Jiang Feng and Zhang Haitao saw that there seemed to be something inside the crack in the door.

"No wonder you can't push it open, you can't smash it open, it turns out that this door is locked." Zhang Haitao said very depressedly.

Jiang Feng could also see clearly, there was a black metal as thick as a thumb in the crack of the door, linking the stone door to the wall, and it looked like it had locked the door. It's just that there is so much metal that it covers a small half of the door frame.

"There's no keyhole on the door, could it be somewhere else?" Zhang Haitao said as he looked at the wall.

Huang Xiaoyue also looked towards the wall, looking for a keyhole or a mechanism. Jiang Feng stood in front of the door pondering, he thought that this stone door should not be able to be opened from the outside world. As for why he thought so, he didn't know the reason, just his intuition.

Click! Click! Click!

Suddenly there was a voice from the door, whether it was Jiang Feng, or Huang Xiaoyue and Zhang Haitao, who were looking for them on the wall, they all looked towards Shimen.

Jiang Feng, who was closest to the stone gate, stared at the crack in the door with wide eyes, and he saw a metal rod that locked the stone door shrink into the wall. The click just now was the same sound that the metal made when it retracted.

Jiang Feng hurriedly cleaned up more dust from the crack of the door, and soon Jiang Feng found that in fact, this door was originally covered with that kind of metal rod all around, but many of them had been retracted, just like the one that had just been retracted.

"I understand that this stone door cannot be opened by external force, only by waiting for it to open on its own." Jiang Feng said.

"So if we just wait, the door will open on its own?" Huang Xiaoyue said.

Jiang Feng nodded, and he also carefully observed the remaining metal rods. After he counted the number and analyzed it in his mind for a while, he roughly knew when the stone door would be opened.

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