Qi Yang hesitated for a moment before frowning and replied, "It takes a lot of blood to pass the later level. The word "Blood Cave" comes from this."

Ling'er was shocked when she heard this.

However, Qi Yang did not explain much, but looked at the murals.

Ling'er guessed that it would also be mentioned in the mural, so she continued to look down seriously.

It turned out that the people in the painting took some blood with a stone bowl and drank some of it, and poured all the remaining blood into a bucket-shaped container. The blood flowed down the pipe and then a door on the side opened.

Compared with the murders and drinking blood to quench thirst, it is not so terrifying to open the door if you let blood be used to open the stone door. Ling'er was even more curious at this time how blood was used to open the stone door.

"Why did the door open as soon as the blood flowed down?" Ling'er turned around and asked Qi Yang.

"The girl comes down and see, and you will know." As she said that, Qi Yang took Ling'er to a flat stone wall.

"So the door is here!" Ling'er then realized that there was actually a stone gate hidden here.

Qi Yang walked to the left side of the stone gate and signaled Ling'er to take the torch.

Ling'er approached and looked at it with a torch, and saw a roller, exactly the same as the one that opened the gate of the "Blood Cave".

"Can you open this stone gate just by turning it?" Ling'er asked Qi Yang.

"Not bad! However, no matter how strong you use, you can't turn it, because the turning mechanism inside is stuck." Qi Yang explained.

Ling'er looked towards Qi Yang's finger and saw a stone protruding out inside, blocking the rotation of the roller.

Qi Yang continued: "To turn the roller to open the stone door, you must first move the protruding stone away."

Ling'er found that the protruding stone was located on the inside, and the gap outside was very small, so she could not reach into the hand or other things to remove the stone. She had to ask Qi Yang: "How can I move it away?"

Qi Yang took out a small stone and drew it on the stone wall. While drawing it, he explained to Ling'er: "There is a pry stick inside, and the protruding stone is pressed on one end of the pry stick. As long as there is a heavy object falling on the other end of the pry stick, the obstacle will be lifted."

"Where is that heavy object?" Ling'er asked again.

Qi Yang drew a large spoon above the spoon, and then added a rolling stone to the large spoon.

"How did you learn about these mechanisms?" Ling'er asked in surprise. Could it be that Brother Yang had been here before?

"I just saw it from the mural." Qi Yang replied.

Ling'er couldn't help but sigh at Qi Yang's extraordinary wit. She just looked at the layout of the mechanism on the stone wall. It was so dense that she couldn't understand it at all. Unexpectedly, Qi Yang understood the mystery of the mechanism in such a short time!

"This spoon can be tilted." Qi Yang explained.

"If you want the rolling stone inside to roll on the pry stick, just let the spoon tilt?" Ling'er guessed, "and to tilt the spoon, you need to add weight to the spoon, such as filling water?"

Qi Yang nodded.

"Do you have to use blood?" Ling'er asked frowned, because she immediately thought of the poisonous water in the ditch.

"It seems that's true. I couldn't figure out why I had to use blood, but when I saw this, I realized that all this was in the calculations of the agency designer." Qi Yang said, pointing to a gap in the upper left of the roller.

Ling'er stood on tiptoe and saw that the gap in front of her was the bucket-shaped container painted on the mural?

"Miss, please see what material the pipe inside is." Qi Yang reminded.

"It's woody, which means that the water in the ditch cannot be used instead of blood?" Ling'er frowned.

"Yes." Qi Yang nodded, "Once the water containing 'soul-eroding' is poured in, these pipes will no longer exist, and this stone gate will never be opened."

"The agency designer is so cunning!" Ling'er sighed.

Qi Yang sighed, and there seemed to be no other way at the moment.

Ling'er suddenly thought of something and said, "We can use the water we bring!"

"No!" Qi Yang opposed, "We will die of thirst without water, and we will shed some blood but nothing."

"Then use my blood?" Ling'er said timidly. She felt weak when she thought of bleeding, but even so, she could not let Qi Yang lose blood again.

Qi Yang shook his head and said, "I have said that the girl will not be injured!"

It turns out that Brother Yang has always said that "injured" is this! Ling'er was moved.

Ling'er looked at Qi Yang's pale face and said with pain: "You have lost too much blood and can't bleed anymore! You'd better use water! Just bear with it if you are thirsty."

"Miss I thought I could go out after opening this stone gate?" Qi Yang asked with a raised eyebrows.

"What else is behind this stone gate?" Ling'er looked worried.

"There are rumors in the 'Blood Cave' in the rivers and lakes that there are seven stone gates in total, and as long as you pass the six paths in the front, you can pass the test smoothly." Qi Yang replied.

"Six Paths? So many?" Ling'er said in surprise.

"Fortunately, we have seven people, and there are many people and great power." Qi Yang comforted.

Ling'er remembered that Ji Cangyu and Qi Yang both mentioned that they needed everyone to work together to pass the subsequent levels. It turned out that this was true.

"Where does the seventh gate lead to?" Ling'er asked.

"No one has ever mentioned the seventh gate of the 'Blood Cave' in the world. Even if it is the secret inside the underworld, right?" Qi Yang said.

Ling'er looked back at the murals. Because they were far away and the light was dim, they could only see a rough outline.

Ling'er approached and counted. Those who passed the level did go through six fights, and only one living person was left after the last fight. There was no description of the seventh gate afterwards.

"And these six doors cannot be opened continuously, and each door has a time interval to open." Qi Yang also followed Ling'er.

"Why is this? Can't you open the stone gate just by pouring blood?" Ling'er was puzzled.

"I don't know this. I only know that it will take one or two days to break through the Six Sects at the fastest, so the water we bring can only be kept for drinking." Qi Yang said.

"I understand." Ling'er replied softly.

"We have no way out, no matter how difficult it is, we have to go on." Qi Yang said in a deep voice, "Stay good rest! When the owner of Ji and the others come out, we will discuss countermeasures."

Ling'er nodded. She looked at the murals again and asked, "Are these murals teaching the passers-by how to break the formation? How do I think..."

Ling'er didn't say anything more, but Qi Yang understood what she meant and replied: "Yes. The designer of the agency wants to guide the passers-by to kill each other. Looking at these murals will make people feel murderous and motivated."

"But not everyone wants to kill someone when they see it, right?" Ling'er frowned.

"Not bad. However, as long as one of the seven people has a killing idea, it will be fine. Others will have to participate in it in order to protect themselves. When they are jealous of killing, how can they care about anything else?" Qi Yang said.

-----
Chapter completed!