My chosen ones are all the fourth disaster

Seeing the shape of the wax seal on the envelope, David's eyes flashed.

The smile and silliness on his face disappeared.

He looked at the three people again seriously.

"This is not a place to talk, follow me."

He slapped the broken fence of the container on the left.

"Bang!"

The doors and windows closed with a sound, and the vision was instantly dark.

With the enhanced night vision ability after the upgrade.

The three players could see David walking quietly to the back.

Lin Xian put away the envelope.

"Let's go, let's follow!"

There was a narrow staircase leading directly to the underground under the back door.

David stood at the bottom with a torch.

Lin Xian picked up another torch hanging on the wall without hesitation and lit it, and followed behind.

The space below was huge.

The three of them followed behind and turned left and right.

If David hadn't stopped to wait for them occasionally, they would have lost him long ago.

At another turn, Luanma silently calculated the distance to the store above his head.

"788, 789... Did he open up the underground of the whole street?"

Jueliu opened his eyes wide: "So I'm not bragging, their chamber of commerce is really rich?"

Lin Xian looked at the dark passage when he came.

"They brought us down to such a place, it seems that the other party is one of their own."

"One of their own?"

Jueliu was extremely surprised, and frowned the next second.

"But didn't Old Ye say that there are not even 10 watchers outside?"

The plot of the game is that the other party has no hope of revival, so they come to find the players.

"They may not be watchers, but their leader can be." Luanma guessed.

"Otherwise, Old Ye would really be alone and seriously injured, and the grass on his grave would have grown long ago!"

Lin Xian: "Maybe even his ashes have been scattered."

David listened to the strange language behind him.

His guess about their identities became more and more certain.

But the test that should be done is still necessary.

He pushed open the door of a dark room.

"We're here. Follow me in."

The dark room is not big.

Except for the square stone table in the middle and a few feather pens, there is almost nothing.

The three players did not go in immediately.

Instead, they stood cautiously at the door.

"What do you want to do?" Lin Xian stared at David, whose face suddenly changed.

David crossed his fingers and leaned on the stone table.

"Is the person you are looking for a knight wearing silver-white armor, with brown hair and blue eyes?"

Edgar!

The two tasks are actually related to each other.

Lin Xian suppressed his excitement and asked, "Do you know where he is?"

"I can't tell you before I confirm your identity."

David's face was cold and sharp, and his eyes were sharp.

"With the code on the stone table, our conversation can naturally continue!"

"Code?" Jue Liu asked in a low voice, "Did Lao Ye tell us this when we left?"

"Don't doubt it, it's true." Luanma replied.

But as the saying goes, we are here now.

Even if the information content about the code in their minds is zero.

The three of them still chose to look at the first half of the code first.

They chose to let Lin Xian go in, and the other two stayed at the door.

In case this is a trap, the three of them will be wiped out.

They watched Lin Xian walk into the stone table with a serious face.

Then, his expression cracked.

"Are you sure, this is a code?"

"Of course!" David was sure, "Only those who can match the code are members of that organization."

He observed Lin Xian's expression obscurely and thought it was strange.

The other party did not look confused, nor did he look confident.

The emotions on his face were so complicated that he could not understand them at all.

"Don't you know?"

"Uh, I should know... right?"

Lin Xian's expression became more complicated.

It was written on the stone table:

[In the Kingdom of Naris, there is a mysterious crystal called "Time Crystal".

Assume that the relationship between its energy E(t) and time t is described by the following function: E(t)=t^3−6t^2+9t+1.

Derivative and analyze the monotonicity of the function.

1. Find the derivative E′(t) of the function.

2. Determine the increase and decrease interval of E(t).

…

】

"Hiss!"

The code is actually a high-level math problem!

What kind of code is this? !

Lin Xian took a breath.

No, after thinking about this problem, his brain is a little short of oxygen.

Three minutes later.

Lin Xian gave up completely and walked back with his head covered.

"No, let's change someone to check the code!"

David didn't understand, but respected.

"Okay."

After becoming a confidant and understanding the relationship between the Chamber of Commerce and the Watcher.

He also learned about the stone table.

Knowing that the code on the stone table changes every 10 days, it takes time to decode the code each time.

So we changed people, time-consuming, are all very normal things.

Outside the darkroom.

The two people who were waiting nervously at the door saw Lin Xian coming back and immediately leaned over.

Jueliu rubbed his clothes: "How is it? Is there any trick with the secret code?"

"It can be, or it can be not." Lin Xian was as wooden as a dead person.

Two people: "???"

"Anyway, you will know when you go over and see it."

Half an hour later.

The three players leaned against the stone table with vicissitudes, as if they had aged ten years in an instant.

"Help, help..."

"Why do you have to learn advanced mathematics to play games..."

"Alas..."

After half an hour of ineffective efforts.

The three people deeply understood what it meant: if you don't know mathematics, you don't know it.

Lin Xian took a breath and changed his sitting position tremblingly.

"I am a game blogger who has been away from school for many years. It is normal that I can't do it."

"Why can't you two do it?"

Jueliu looked at the ceiling blankly: "I studied liberal arts just to get rid of mathematics."

Who knew that he would escape by going to college.

Can't escape by playing games? !

Lin Xian turned his head and looked to the other side.

"What about Brother Luanma? Military academy doesn't teach cultural subjects?"

Luanma had a blank expression: "Since my dad couldn't beat me, cultural subjects were not within my consideration."

Lin Xian: "... I should have brought Boredom along."

"Bored won't work either." Jue Liusheng Wulian said, "He's a high school student."

The room fell into a deathly silence.

A college math problem successfully stumped everyone.

...

"A-choo!"

Boredom sneezed on the street.

He rubbed his nose.

"Who is scolding me behind my back?"

Cayman stopped and turned his head, with a question in his obsidian eyes.

Boredom waved his hand.

"It's okay, you continue."

He turned back obediently and continued to shuttle Boredom in the remote alley.

While explaining in a hoarse voice.

"Fire Tongs Street is close to the wealthy area, and the crowds on the street are the most complicated. The only mercenary tavern in the town is also there."

"If you want to find someone, or some secret information, it's the best place to go."

It's probably because it's close to the wealthy area.

The dirt road, which was originally full of potholes, began to have neatly paved cobblestones.

With Cayman, a kid who is familiar with the terrain, leading the way, Boring easily found the tavern called "Angel's Kiss".

It's unfortunate.

As soon as he arrived, he saw black smoke coming from the direction of the tavern.

There was already a circle of people around, pointing in the direction of the black smoke.