Ever since he encountered the mutated grassland otter in the Thorn Tribe, Ye Xi had been thinking about what weapons could effectively kill such a behemoth.

They are so large that bone knives and spears stab them like thorns in their bodies, they don't hurt or itch, and even the venom attacks very slowly.

Making gunpowder?

However, it is not enough to know the ratio of black powder to make a super cannon or a super bomb.

After thinking about it for a long time, Ye Xi finally chose the ballista - this masterpiece of the cold weapon era.

A ballista, more precisely a torsion spring ballista, is a lethal weapon that relies on a torsion spring to drive the crossbow arm to drive the bowstring. It has tremendous striking power and accuracy, and can accurately penetrate the body of an enemy through its armor, even from a distance of several hundred meters.

Of course, its structure is also more complicated, and Ye Xi only accidentally read it when he was reading history books, and did not study it in depth, so it is not easy to make it.

After drawing the general structure of the ballista, Ye Xi held the charcoal pen and lowered his head to repeatedly revise, revise, and revise on the parchment roll.

From day to night.

In the faint candlelight, the main beam, bracket, torsion spring group, long groove, ratchet, and winch of the ballista...... The dimensions of the structure were finalized one by one.

Ye Xi walked out of the house with the drawings, gathered more than 30 people from Pingyao, Boshan, and Piercing Armor, and formed a team specializing in making ballistas, and made all efforts to make ballistas.

Half a month later, the first giant ballista was born.

This giant ballista is five meters high, the main material is curved black wood, its power is amazing, it can shoot up to 50 pounds of stone projectiles, and accurately hit the elk running 300 meters away, smashing the elk's internal organs away from the body.

But that's not enough, this is a prehistoric wild world, and what they want to kill is not an elk, but a super monster as huge as a mountain, and the power of the ballista needs to be further strengthened.

Seven days later, a second improved version of the giant ballista was born.

The giant ballista was larger and required four people to operate, and instead of the torsion generated by the mane of the Great Hyena, it was replaced by the tendons of the more resilient brute bulls.

What's more, it is a ballista that specializes in projecting bronze giant spears, and the diameter of the torsion spring and the length of the spear body are carefully calculated to project the giant spear more accurately.

This time, the bronze giant spear was projected more than 500 meters away, successfully hitting the running elk, and piercing the five-centimeter-thick stone slab tied to the elk's body, killing it.

The crowd cheered.

They were amazed by the power and accuracy of this giant ballista.

Who would have thought that there would be such a powerful weapon before! Moreover, this ballista does not need to be operated by a warrior, and only a few ordinary people can drive this killing machine!

If another giant beast attacks Xicheng, maybe there will be no need to curse the witch!

However, in the thunderous cheers, Ye Xi's face was not much joy, and when everyone stroked the ballista in amazement and tried to shoot again, Ye Xi quietly left the test site.

The ballista test was carried out in secret, in the deep forest a few miles away from Xicheng.

Pingyao was the first to notice Ye Xi's departure, and immediately chased after him: "Lord Xiwu, is there something wrong with this ballista?"

Ye Xi stopped and said truthfully: "The speed of firing the bow is too slow, if the giant beast attacking Xicheng is fast, then before we attack with a ballista, it will rush in front of us!"

Pingyao was stunned.

Oh, yes...... How did they forget that.

Ye Xi rubbed his eyebrows and said, "I'll think about it again, you guys should think about it again, and report to me at any time if you have good suggestions for improvement." ”

Primitive people are not good at designing such complex instruments, so the design of the ballista basically depends on Ye Xi alone, and the work of the past few days has made him a little tired and irritable.

Return to Xicheng.

Ye Xi walked slowly along the stone path, and found that there was still restlessness in his heart, so he simply jumped into the star lake with a pop.

He stretched his limbs to swim in the lake, and the clear water slowly soothed his restlessness and exhaustion.

After his brain calmed down again, Ye Xi even had the leisure to catch a beautiful big fish and carry its tail to the shore of the lake.

"Lord Xiwu!"

On the way to the public fire kitchen with the big fish, Mink suddenly found Ye Xi.

Ye Xi: "What's wrong?"

Mink saluted, paused again, and then said slowly: "Lord Xiwu, I am here to bid you farewell, I want to leave Xicheng and go to another place." ”

Ye Xi was stunned: "Why do you suddenly want to leave?"

Mink: "I want to become stronger, I want to find the source stones, but the source stones around Xicheng have been found, so I can only go to distant places to search." ”

Is it?

Ye Xi stared at his face in silence.

The mink lowered his eyes slightly.

Ye Xi knew that Mink had always had a grudge against the Kurosawa tribesmen, and this hatred could not be soothed even with time, and he often targeted the Kurosawa tribesmen when hunting, provoking them, and even killed no less than five Kurosawa people with different means.

For the sake of the Wolf Tooth Tribe, these Ye Xi turned a blind eye.

Unexpectedly, Mink still couldn't calm the resentment in his heart, to the point where he didn't want to stay in Xicheng.

Ye Xi: "Do you really want to leave?"

Mink raised his head and said, "Yes, don't worry, I'll come back when I find the source stone, Xicheng has always been my home, there are my clansmen and my friends here, I will come back!"

Ye Xi was silent for a long time and sighed, "That's it, it's okay to leave, but wait a few more days." ”

Mink hung his head and replied, "Okay." ”

Because of the news that Mink was leaving the city, Ye Xi could only temporarily put down the research of the ballista.

Mink is now a fourth-level warrior, and his strength is not low, but it is still not enough to see in the wild land full of dangers, and it is possible that he will be met with accidents as soon as he walks a few hundred miles.

So he wanted to make the Stealdom.

Ye Xi had just started to make hidden dominoes, and Ze of the Tree People Clan suddenly came to the door and said that he wanted to leave Xicheng.

Ye Xi rubbed his temples and laughed angrily: "Why do you want to leave too?"

Ze keenly caught the word again: "Does anyone else want to go?"

Ye Xi was silent, just looked at him.

Ze hurriedly saluted and said, "Lord Xiwu, please forgive me, it's really because the patriarch of our Treant Clan is about to be unable to hold on! I must go outside to find another lost Treant Clan, get the Origin Crystal, and rescue the Patriarch." ”

Ye Xi: "Do you know about this?"

Ze: "The Great Witch knows, and he agreed." ”

What he didn't say was that the Treant Clan Great Witch originally disagreed, but seeing that the situation of the Treant Clan Patriarch was really bad, he reluctantly agreed, but he still didn't want Ze to go in person.

Ze struggled for a long time before the Treant Great Witch reluctantly nodded.

Ye Xi: "Since this is the case, I won't stop you, you can wait a few more days before leaving, and then set off with the mink of the Tushan tribe and be with each other." ”

"Yes!"

Ze didn't have much contact with the Tushan tribe, and he didn't know Mink, so he just responded when he heard the words, and there was not much surprise in his eyes.