The difficulty of the experiment is how to measure the frequency of the excited sound waves, which are not available in the game.

Fortunately, Yang Hao didn't do research from scratch, there were books on principles and everything, he just needed to know that the frequency of sound waves was the most lethal.

After several experiments, Yang Hao realized another problem, that is, there is a slight difference in the resonance frequency of the internal organs of different organisms, which is still the result of the condition that he chooses samples with little difference, and it can be expected that this difference will expand with the expansion of biological differences.

In fact, it is not difficult to imagine that the resonance frequency of human internal organs and dragon internal organs must be different, because the structure and composition of internal organs are very different.

This discovery made Yang Hao very frustrated for a while, and the application range of sonic witchcraft was much smaller.

He told Yennefer his doubts, and he immediately replied:

"Wouldn't it be nice to use reconnaissance sound waves to detect the structure first, and then launch an attack."

Ye Naifa replied as a matter of course, and woke up Yang Hao in the "chessboard": he didn't need to find the sound wave frequency that was suitable for all living things, as long as he could emit sound waves of all frequencies.

For common creatures, such as humans, crabs, spiders, etc., as long as you get their internal organs, experiment with the applicable frequency, establish a database, and use them directly during battle.

The uncommon ones can emit ultrasonic waves to probe the structure and find the frequency of the desired infrasound wave, which is more troublesome, requires strong computing power and a lot of experience, and takes a long time.

Fortunately, Yang Hao completed two primary demon hunting tasks and accumulated some merit points.

In this way, he can entrust the alchemist of Kyle Mohan to make the voice organ of the queen ant into alchemy items, just to strengthen the structure of the organ and embalm, it will cost Yang Hao all his merit points.

But it's all worth it, the alchemized queen ant's vocal organ can emit sound waves of 0-30 hertz without hindrance, reducing the consumption of mana by 20%, saving Yang Hao a lot of trouble.

When looking for ultrasonic materials, it was not smooth, and the general metal materials could not withstand the high-frequency vibration and disintegrated, and finally Yang Hao spent a lot of money to buy a small piece of gold crystal, which was barely applicable.

However, the magic power consumption of the excited ultrasound wave has reached more than ten times that of the infrasound wave, and the practicality is a big difference.

After three days of hard work, the next game day begins.

Yang Hao asked for leave today, because of the strong wind, they will arrive in Craigie City this morning, he is ready to greet them, and let them also participate in the demon hunter test.

It is indispensable for old friends to have a frolic when they meet, especially the members of the group who are not with Yang Hao in reality, and they are even more happy.

Just when Yang Hao wanted to do a little bit of the landlord's etiquette, he suddenly found that he hadn't visited Craigie City yet, and he had to make up for it today.

Craigie City is the largest city in the south of the Stormwind Kingdom, enjoying the reputation of the city that never sleeps, and the trade economy is extremely developed.

Yang Hao and his group of more than 40 people walked on the street not abruptly at all, because there were teams like them on the street, but most of them were caravans.

Merchants from the north of the kingdom work day and night to deliver Craigie's Black Forest products, all kinds of magical potions, materials for magical beasts, and even slaves of the dark race.

Although Yang Hao and his entourage from modern times are well-informed, they are still shocked by the scene of the city.

In 2035, when the Internet and logistics are extremely developed, online shopping will become the mainstream way for people to shop.

"Let's let, let's let!"

A team of blood-covered and fierce mercenaries pulled a cart to "swagger through the city", and a monitor lizard with a body length of 3 meters in the car was lying motionless, its back was full of wounds, and there was a hideous big gap behind the side of the neck, surrounded by dried blood, obviously a fatal wound here.

"It's the Dramor dragon! Tucker: They're in luck! ”

"This is going to the Cat's Paw Tavern, the meat of the Dramor monitor lizard is notoriously strong!"

Passers-by talked a lot, and the foodie Cheng Fat Man couldn't wait to go to the tavern with him, and eat it now.

"Brother Hao, the competition among the mercenary groups here seems to be fierce!"

Lin Tian was the most responsible of the several deputy commanders, and he was always worried about the affairs of the mercenary group.

Along the way, there have been no less than 10 mercenary groups coming and going, and they are all professional mercenaries with a level of 10 or above, not comparable to those crooked melons and cracked dates in Baishi Town.

"God, don't worry, I've thought about this for a long time, and I'll talk about it at the dinner table." Yang Hao said with a smile.

"Yes, yes, eat first, and then talk about things after eating." Cheng Fat Man raised his hands in favor of Yang Hao's decision and immediately supported it.

Lunch was at the Cat's Paw Bar, and since I met it, I couldn't say anything about not trying the Deramore monitor lizard.

The Deramore monitor lizard, also known as the Deramore Disaurus, is the most inferior type of the Earth Dragon, with thin dragon blood, but it is also a level 16 magical beast, with a strong body and amazing defense.

The number of Deramore monitor lizards is scarce, and they are magical beasts that act alone, so hunting is not only based on strength, but also has a certain amount of luck.

The signature dish of Cat's Paw Bar is the Deramore Steak, which has been purchased with the task of buying Dlamore monitor lizards all year round, and the bounty is very rich, so these monitor lizards are nicknamed "good luck lizards" by the mercenaries of Craigie City.

The signature dish also means that the price is expensive, even the wolf warriors with a thick net worth can't help but feel pain, and Yang Hao can't afford to invite it, so this dinner is the account of the mercenary group.

The flavor of the Dramo steak is indeed worth the price, especially the constant warmth after swallowing, which makes people sweat incessantly and very pleasant.

"Brothers, we're not going to be human anymore!!"

After a full meal, Yang Hao said a sentence that will be famous in the history of games in the box of the cat's paw bar.

Everyone in the wolf warriors looked at each other, not knowing what their boss was crazy about.

"Brother Hao, you make it clear, we don't understand." Dafeng knew that Yang Hao was not a person without a purpose, and he easily did not express his opinion, once he exited, it was well thought out.

"I mean we're not going to be mercenaries anymore and let's move on to a more promising profession."

"What! Is the mercenary group going to be disbanded? "The sixth son is the youngest, and he has the least concentration.

"Haha, of course not, I decided to set up a demon hunter group, demon hunters are much more promising than mercenaries."

"Brother Hao, the demon hunter is very good, but the demon hunter group? I don't think there's such a thing. Lin Tian was the most realistic and immediately considered the deep problem.

"It's not difficult to form a demon hunter group, it's just a matter of form, the key is to become a demon hunter apprentice first. I believe that the various attribute tests are difficult for you elites, but in the final grass trial, you may really die. ”