Next, Jiang Feng began to select the materials needed for the needle-type thunderbolt egg, the needle tip and the first half of the needle-shaped thunderbolt egg will have high requirements for the material, because it must have strong penetration, and the toughness must be very strong, and then there is another point, that is, in the part of the installation of the thunderbolt egg, it must be conducive to the explosion of the thunderbolt egg, and it is best to explode when it explodes, the peripheral materials can be completely exploded, and the material itself can also form effective damage.

As for the tail of the needle-type thunderbolt egg, it only plays a role in stabilizing the flight trajectory, and there are no requirements for the material.

Soon, Jiang Feng designed a hollow needle tip with a small cap according to the requirements, which was just suitable for installing a thunderbolt egg on the back, and the part connecting the needle tip was a spring wire, which would bounce up disorderly and blow up into various shapes once it exploded. Its biggest feature is basically the effect of a spring.

Before causing the explosion of the lightning egg, all the spring wires are tightly compressed, so the area occupied will be very small, and when the explosion occurs, the explosion wires will bounce up quickly, and the area will skyrocket dozens of times in an instant.

The effect is like throwing a stone into the calm water, stirring up a large wave.

Another half an hour had passed, and Jiang Feng had already shown fatigue.

However, in front of him, a made needle-shaped thunderbolt egg was already presented.

The shape of this needle-shaped lightning egg is very similar to that of an ordinary iron needle, but the needle shaft is slightly thicker, which is mainly due to the installation of a lightning egg. If the composition of the thunder source stone is too small, the explosion will not have the desired effect.

In addition, the tip of the needle-shaped thunderbolt egg is extremely sharp, emitting a terrifying cold glow, not to mention using a short-range attacker, even if it is shot out casually, it is no problem to pour it directly into the stone.

The whole needle-shaped thunderbolt egg is less than three inches long, short and concise, and a few shallow grooves are added to the tail fin, which has a stable flight trajectory.

"I don't know what its power will be, I'm curious to know. ”

Jiang Feng looked at the needle-shaped thunderbolt egg, and a happy smile appeared on his face. It took him most of the night to finally achieve something, and he was naturally very happy.

Holding the needle-shaped thunderbolt egg, Jiang Feng walked out of the refining room and came to the courtyard.

That light rain had already stopped, and the clones, the big head and the big spider were still cultivating, and when they saw Jiang Feng coming out, they all immediately stopped cultivating and surrounded them.

"Master, has that thing you researched yielded any results? The big head asked first.

"Yes, I'm trying to test it out right now. Jiang Feng said with a smile.

"Then how do you test the law?"

Jiang Feng swept around the courtyard, and finally fixed his eyes on the boulder that the big head used to exercise his strength. This one-meter-square stone is exactly the touchstone of the needle-shaped lightning egg, but it is not known what kind of effect the needle-shaped lightning egg will have when shot into the boulder.

"Big head, how about you see me shoot it with this?" Jiang Feng said to the boulder with a needle-shaped thunderbolt egg in his hand.

"Iron needle?" the big head blinked, "Master, you want to test the sharpness of this iron needle to see if it can shoot into the stone?"

"Yes, I'll see if the needle is sharp enough. Jiang Feng said with a smile.

Datou nodded, "Master, I think it's about the same, with the master's strength and explosiveness, if you can't shoot the iron needle into the stone, wouldn't it be too childish." ”

Jiang Feng smiled slightly and said, "Big head, it's not me who fights, I want you to try it." ”

"Let me?" Datou was stunned, he didn't understand what the master meant, but since the master had an order, he could only do it.

The big head was attached to the flesh of Zhu Qian, and the huge hand came to grasp the embroidery needle, which added a lot of difficulty to the big head.

He pinched the needle-shaped thunderbolt egg, aimed at the boulder not far away, turned around and said unconfidently: "Master, don't laugh at me, I haven't completely controlled this body, and some movements are not coordinated enough." ”

"It's okay, just hit the right stone, it doesn't take much effort. Jiang Feng comforted.

The big head pinched the needle-shaped thunderbolt egg, aimed at it a few more times, flicked his wrist, and threw out the needle-shaped thunderbolt egg.

I thought that a small iron needle could do anything, but this "iron needle" drew a cold light, and a straight shot penetrated into the boulder.

It's so sharp!

However, several onlookers were still amazed by the sharpness of the needle-shaped lightning egg, and the boulder suddenly caused a dull explosion.

"Boom"

Gravel flies and dust flies.

Not to mention how powerful the sensory effect was, even the ground where they were located was shaken, as if it had been earthquaked.

Is this still the effect of that "iron needle"?

The big head, the big spider, and the clone, all of them were gray-faced, and they looked at the boulder in surprise. Jiang Feng waved his hand, and a strong spiritual power turned into a strong wind that blew all the dust away.

In front of them, there was no longer the boulder, but a pile of stones that had been completely broken down into fist-sized pieces. The stones are almost the same size and size, and they are scattered there.

"Lord, master......" The big head was so shocked that he couldn't speak.

Jiang Feng smiled: "This is a bit beyond my expectations, but the effect of the lightning strike is so good, it actually disintegrates the stones in an instant!"

"Lightning strike, master, what exactly did you give me just now?" The big head no longer thinks that Jiang Feng gave him an ordinary iron needle.

"What's it called?" Jiang Fenggang wanted to say that it was a needle-type thunderbolt egg, but this egg word was not appropriate, to be precise, it should be called a needle-type thunderbolt, "Big head, I call it a needle-type thunderbolt!"

The needle-type thunderbolt is the first new type of hidden weapon renamed by Jiang Feng and innovated on the basis of Mu Yingxue's thunder and lightning egg. Of course, if you simply sort by model, it can also be called a type of thunderbolt.

According to this calculation, Jiang Feng will also study the second-type thunderbolt bomb, the third-type thunderbolt bomb and so on.

But with a near-perfect start, will it be hard later?

Jiang Feng rested in the courtyard for a while, which can be regarded as relieving the tense nerves. If you spend too much time on your mind, you will get tired. The combination of work and rest can have better efficiency.

After a quarter of an hour, Jiang Feng returned to the refining room, and with the successful development of the needle-shaped thunderbolt, it was time for him to focus on the short-range attacker.

However, the template of the short-range attack weapon has been imprinted in the head, and the main thing is to refine the channel suitable for the needle-type lightning bomb, so that the research of the needle-type lightning bomb is put in the first place.

The difficulty here is how to easily install the needle-type thunderbolt, because there is the Shouyang Wanhua furnace, and a large number of needle-type thunderbolts are not a problem at all. With the scale of the Shouyang Wanhua Furnace, each refining needle-type thunderbolt can reach hundreds, or even thousands.