It was a metal ball the size of an adult's thumb, Yun Fei looked at it, the shell of the metal ball was completely made of cold iron, very crystal clear, according to Yun Fei's memory,

It is extremely difficult for cold iron to form a round shape, and unlike ordinary metals, cold iron can only be found in extremely cold and extremely cold places.

In such a cold iron, the melting point itself is also extremely high, Yunfei believes that even if he is blessed by the fourth-level forging furnace, he can only forge the cold iron through thermal deformation, and cannot achieve the free shaping of molten iron.

This is also why when Yunfei was in the Forge Association, he found that the workbench made of cold iron was very smooth as a whole, and even the edges and corners of the ordinary workbench had never been formed.

It seems a bit of a fantasy to want to make Han Tie shape a complex form, but of course, it is not impossible for someone like Master Qin Tian who has extremely high attainments in forging techniques.

But because of this, this metal cannot really reach mass production, everything is in the experimental stage, so Yun Fei has no bottom in his heart, but for the four of them, this is also the last resort.

Besides, the three of them have already run out of ammunition, not to mention that Chen Feng desperately used the earth guard to defend, and even Huahua, who began to consume relatively little, has entered a semi-comatose state because of the use of spirit snakes, but when the three of them left, they still held on strongly, not letting Rufeng find the slightest flaw.

For Rufeng, the biggest threat at present is no longer the Tianbao duo of Chen Feng and the others, but Huahua, who has always had many means.

However, not long after the three of them retreated, Huahua fell into a coma, but Rufeng hurriedly solved the spirit snake in her body, and did not find anything abnormal.

Of course, all of this is also in Yunfei's plan, but what Yunfei didn't expect was that Huahua's sudden display of methods was beyond Yunfei's expectations, but it also increased Yunfei's chances of success a lot.

When Yun Fei approached Rufeng fifty meters and stopped, Yun Fei carefully took the metal ball in front of him, and used his soul power to prepare to explore the inside of the metal ball.

However, what is surprising is that this time Yun Fei did not go deep into the metal, but felt the cold, which was as piercing as if it had penetrated deep into the soul.

Immediately, Yunfei gave up his plan to continue exploring, which was also good news for him, at least the inside of the metal ball was very well sealed.

If you look closely, some metals will have dense holes that are connected to each other, but the characteristics of cold iron are strong sealing and very pressure resistant, which is one of the reasons why forgers favor cold iron

Although Yun Fei felt a little sorry because he couldn't explore the inside, he never forgot the purpose of coming at this time, and immediately began to operate according to the words left in the music box left by Lin.

That is to gather the spirit inside the metal ball, in fact, this method is very simple for any spirit master, even when Yun Fei first awakened the spiritual power, it only took a day to master it.

But is it really that simple?

If you want to activate the metal ball, you don't just need to gather spiritual power to trigger, but you need Yunfei to use the perfect coordination of soul power and spiritual power to do it, otherwise it can't be triggered.

This is also Qin Tian's consideration of the possibility of accidental touch, and at the same time, he is also increasing the threshold for using metal balls, after all, only a forger can achieve the spiritual power that allows the metal to continue to absorb balance.

Of course, if there is a forger who does not know how to manipulate the forger and forcibly uses a huge spiritual power to dismantle it, the metal ball will choose to explode itself in the end, which is a means to prevent others from stealing.

This also made Yun Fei have some admiration for Qin Tian, it was really rare to be able to make such a fine cold iron metal ball, and it could even accommodate the burst of a blow at the peak of the spirit source, and the difficulty of its production could also be seen.

Even if Qin Tian is willing to share this technique, there are very few forging masters who can learn it, after all, forging masters are actually divided into many specialties, just like when Yun Fei first stepped into the association and saw a dazzling array of rooms.

"Dididi" finally succeeded in sounding the voice after Yunfei's many efforts, which also indicates that Yunfei has achieved half of the success.

The other half is naturally thinking about how to get close to the wind, the closer the distance is to the wind, the greater the effect, and the higher the hit rate.

However, it is very difficult to get close to Rufeng, even if Rufeng himself is trying his best to deal with the spirit snake, Yun Fei will still be found if he is close to him for more than ten meters, which can be said to be a perception of danger, known as spirit source perception, and only spirit masters who have reached the spirit source realm can barely enter the threshold.

It's just that the range is relatively small, and the longest for the Spirit Source Realm will not exceed more than thirty meters, but more than thirty meters is just fleeting for the Spirit Source Strong.

At the beginning, Zhao Zhen discovered that Askar's existence was somewhat because of the spiritual source perception, and he discovered the abnormality in the cave.

Eighteen meters, seventeen meters. Yun Fei approached at an extremely slow pace, and when Yun Fei got closer to fourteen meters, Rufeng finally noticed that something seemed to be wrong.

Then he looked back, but fortunately, the stealth technique that Huahua taught to Yunfei was still working, and it happened that there was a stone in front of Yunfei.

Rufeng only roughly searched with his soul power, and then continued to destroy the spirit snake, in fact, he didn't think in his heart that there would be any threat from his rear, even if there was a sneak attack by Yunfei who had not appeared, it would be impossible for him to cause any effective damage.

He was also sure that Yunfei could not have the same spirit-level exercises as Huahua, and even if he had spirit-level exercises, he would not be able to release the full power of the exercises for the spirit body.

"Damn the spirit snake, you actually want to absorb my spiritual power, but fortunately I have suppressed you" Rufeng smiled slightly, everything was according to his expectations, although the spirit snake is very strong, but Rufeng is stronger, plus the spirit snake has no follow-up spiritual power supplement, it is only a matter of time before the spirit snake is completely eliminated.

Soon the spirit snake has shown fatigue, and its body has become very transparent, in Rufeng's opinion, the spirit snake at this time is already a trapped beast, although it is still resisting, but it is getting weaker and weaker, Rufeng sneered.

Just when the spirit snake was about to dissipate, Rufeng suddenly felt a chill behind him, and a strong sense of crisis emerged, only to see a person appear behind him, and Rufeng took a closer look at Yunfei who he had been looking for.

Before he could rejoice, he saw a crossbow appear in Yun Fei's hand, and then a metal ball the size of a thumb was launched.

Rufeng was stunned for a moment, but then Rufeng felt that the inside of the sphere began to exude extremely terrifying spiritual power, and even surpassed the aura that he could emit as a late stage of spiritual source.