"Hahaha! I really am a genius!"

Zhang Feng looked at his masterpiece with some pride.

A golden engine, powered by a suspended mysterious crystal, made a humming sound...

This looks very scientific!

The mysterious crystal could not be used directly as an energy source, but Zhang Feng had a special ability, which was to extract the mysterious power from the mysterious crystal, whether for his own use or for others.

Zhang Feng felt that his ability might be able to make good use of the mysterious crystal.

So, Zhang Feng conducted many experiments and finally found a feasible solution.

"…It's okay. I want to go to the East China Sea."

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Feeling the temperature around me suddenly increase by half a degree, I knew without thinking that the little red dragon was coming.

"you……"

Hill lowered her head and Zhang Feng couldn't see her expression.

Dad was scared to death! After everyone finished packing and made sure there was nothing missing, they left.

Shouldn't she be the one to make fun of the kittens? Windsor didn't dare to refute, but just snuggled into Zhang Feng's arms again.

"That's right."

Hill was stunned when he heard Zhang Feng's words.

“…Okay.”

"What's wrong?"

"Zhang Feng!"

But Zhang Feng still breathed a sigh of relief.

Hill looked at Zhang Feng in confusion.

Alas, not cute at all! The airship of Hongye City once again took off amid the envious gazes of countless people.

Zhang Feng asked.

"Yes, that's it—"

Coming to the wall, Zhang Feng casually knocked off a thumb-sized, irregularly shaped piece of transparent crystal, and an idea came to his mind.

The energy difference at each level is ten times.

Nothing else, just handsome.

The airship, which had switched to new energy, was very fast and it reached the Fire Wing Mountains in no time.

Hill turned around and said to Zhang Feng.

The Fire Wing Mountains at this time seemed to have not changed much compared to before, except that the temperature here was not as high as before. The reason for this, of course, was that the little red dragon had eaten up all the magma here.

“Start digging!”

After parking the airship, led by Hill, the group walked into Hill's former dragon's nest.

"Why?"

After hearing Zhang Feng's assurance, Hill snorted coldly.

While Zhang Feng was thinking, a red figure pushed the door open.

Seeing the fox-eared girl giving him crazy looks, Zhang Feng broke out in a cold sweat! "Ahem, it was the last time we came together to pick up the orcs. What I mean is, if we had found a crystal mine last time, we wouldn't have had to make this extra trip..."

The group returned to Hongye City smoothly.

“…Forget it, I don’t want to go again!”

Zhang Xiaotang looked at Hill strangely.

Zhang Feng subconsciously wanted to pinch Hill's dragon horn, but when his hand was halfway there, he suddenly felt a chill on his back, so Zhang Feng decisively gave up.

But Zhang Feng could clearly tell that she was in a much better mood.

"Then can you take me with you?"

Zhang Feng frowned. Unfortunately, the mysterious crystal was too rare and could only be used by witches. So far, Zhang Feng had only met Tina, a witch. Even if he wanted to buy it, he couldn't find a way.

Looking at Windsor snuggling in Zhang Feng's arms, Hill felt inexplicably unhappy.

The problem of the mysterious crystal has been solved, and what remains is where to use it.

Zhang Feng now likes Windsor more and more. She is obedient, sensible, has a good temper and is pretty. Apart from her weak ability, her only shortcoming may be that she carries an airport with her.

Hill nodded.

"Humph, you coward!"

Zhang Feng immediately devoted himself to the "scientific research undertaking". In fact, it was very simple. He just had to extract a trace of energy from these mysterious crystals.

As for the airships and large ships produced later, Zhang Feng also prepared a lot of mysterious crystals for them.

After level 5, there are crystal balls, which are also divided into five levels by Zhang Feng, from level 6 to level 10. Although Zhang Feng currently only has a level 6 crystal ball, it does not prevent him from making rules.

Hill had never encountered a creature larger than herself before, so this time, she was eager to take a look.

Zhang's face immediately showed joy.

"No, you can't go!"

"Well, don't worry. I, Zhang Feng, will always keep my word for what I promised. Let's go together later!"

"Why? I am only here to inform you, not to ask you for anything. You have no right to order me!"

"Well, going to the East China Sea? You don't want to look for that black shadow in the sea, do you?"

So there are ten levels in total.

Zhang Feng wiped the non-existent cold sweat from his forehead.

But people will grow up eventually, and there will still be room for development in the future.

"Oh~"

Hill turned his face away somewhat unnaturally.

For an ordinary car, a first-level broken crystal is enough. Zhang Feng made a simple estimate and found that according to the current situation, it would be no problem to use it for 20 to 30 years! As for the train, because it consumes more energy, Zhang Feng put a second-level broken crystal, which can also be used for 20 to 30 years!

However, she was unwilling to tell these things to others, so Zhang Feng naturally didn't know about it, so Zhang Feng decisively refused.

"Master, is it scary in there?"

In this way, although the mysterious crystal is still the same mysterious crystal, it is like it has been blessed. It no longer needs Zhang Feng's manipulation and can be used directly as energy! Later, Zhang Feng even found that it didn't even need to be so troublesome. He just drew out a little energy from the mysterious crystal and the mysterious crystal could be used!

Although these crystals have no shape and don’t look good, Zhang Feng doesn’t mind. As long as they can be used, it’s fine!

He regretted agreeing to Hill. Not to mention that this "chocolate cream lollipop" itself was difficult to make, just look at the size of the lollipop. How much raw materials would be needed for a castle-sized lollipop! "Huh~"

Zhang Feng was not sure what his behavior meant, but he knew that he had truly discovered a new energy source!

“This is it.”

Zhang Feng finally understood why the little red dragon was willing to follow him.

Zhang Feng’s transformation is also very simple, just reinforcement is enough.

Hill nodded and said nothing more.

With the presence of the two great Jinchūriki, Hill and Zhang Xiaotang, this crystal mine had no power to fight back at all. It didn't take long before it was dug up completely.

"It is indeed the mysterious crystal!"

Zhang Feng still disagreed.

Windsor is a bit timid.

No matter what, she is not a human, but a dragon. She wants to see her people and also wants to know her own life experience.

Hill whispered.

Open the eyes? Open the shackles?

After twists and turns, sporadic reflections suddenly appeared in front.

Hill recalled for a moment, then spoke again.

Zhang Feng explained with a somewhat unnatural look on his face.

Zhang Feng thought that he might be overthinking it.

This will make future use more convenient and minimize waste.

Hill could see the sincerity in Zhang Feng's eyes. He was not lying to her. These were Zhang Feng's true thoughts.

Swish! A trace of mysterious energy entered Zhang Feng's body.

However, he only has one mysterious crystal left in his hand, so he cannot experiment for the time being. Two of the three mysterious crystals Nora gave him have been consumed.

Zhang Feng breathed a sigh of relief.

When Zhang Feng went to the Fire Wing Mountains before, he originally wanted to look for crystal mines, but he accidentally discovered a lot of treasures, so he emptied out the treasures. In order to avoid any more trouble, he went back since he didn't find the crystal mines.

"Ahem, little aunt, the lollipop you want is too big. Even if we ask the workers to work overtime, it will take a long time to make it! I've already asked someone to make it. Just wait a little longer, and I'm sure you'll be satisfied!"

"morning."

The next step was to classify these crystals. Zhang Feng divided them into five levels according to the energy content of each broken crystal, with level one being the smallest and level five being the largest.

Hill was suddenly stunned and asked subconsciously: "Last time?"

But along the way, Zhang Feng kept feeling that Hill seemed to be staring at him, which made him feel very uncomfortable. When he turned around, Hill's expression seemed to be somewhat normal.

"Haha, I'll have to thank little Nina later. I knew there was a crystal mine here. It's a pity that I didn't explore it more last time and only took away the crystal balls. Otherwise, maybe I would have researched out a new energy source a long time ago!"

“…It seems that there is…”

Then Zhang Feng recalled some of the cars in Hongye City, modified them one by one, and even modified the trains.

Zhang Feng still shook his head when he saw this. He said seriously:

Without her saying anything, Zhang Feng had already seen that in the distance there were a lot of glass-like things growing on the wall.

"Good morning, Hill!"

Although a lot of gold coins were spent this time, Zhang Feng felt it was worth it.

"Now we need to get some mysterious crystals!"

Zhang Feng was shocked.

Hill's face looked increasingly worse, as if he would go berserk at any moment.

"good!"

Zhang Feng turned around and greeted him.

That is, he used his own ability to extract the mysterious power from the mysterious crystal, and then injected it into the mysterious crystal again.

"It's too dangerous. Although size does not necessarily represent strength, the opponent is so big that he can't be that weak. When you don't know the opponent's strength, it's very dangerous even if you are a dragon. Not to mention, you won't know how to attack and you will use up your strength at any time. If a conflict really happens, it will be very dangerous!"

It has been confirmed that this is the crystal mine. As for whether it is the mysterious crystal mine, Zhang Feng will know after a try.

"Humph, you haven't given me the 'chocolate cream lollipop' you promised me!"

Hill looked reluctant, but agreed.

Later, when he took Hill to the Fire Wing Mountains to pick up the orcs, he forgot about this matter. Now when he needed the mysterious crystal, Zhang Feng remembered it.

Looking at Hill's hesitant look, Zhang Feng became a little curious. This didn't look like the little red dragon he knew!

“Humph, I am no longer the same person I used to be. Because I have consumed a lot of gunpowder, I am now very strong. Moreover, even if a conflict really occurs and I am not the opponent, I can escape calmly!”

"Thank you, Hill!"

Hill glanced at Zhang Feng calmly and found that he looked tired and even had some dark circles under his eyes. He instinctively wanted to say something, but Hill, who had never cared about anyone, didn't know what to say for a moment.

Zhang Feng took two steps forward, squatted down, grabbed Xi'er's thin shoulders, looked at her bewildered eyes and said, "Xi'er, I'm not ordering you, I'm worried about you! When I become stronger, I will definitely go to the East China Sea. Not only are you curious about the black shadow, I am also curious! When the time comes, we can go together. Even if we encounter danger, we can help each other, don't you think so?"

Zhang Feng suddenly thought, since the mysterious power is so strong, wouldn't it be too simple to use it only as an engine energy source? It can be developed for other uses!

"Ahem, well, Xiao Xier, I seem to have forgotten to ask you before. I heard that there is a crystal vein in the Fire Wing Mountains. Is it true?"

Zhang Feng was a little excited. If Hill hadn't led him to this place, he might not have been able to find it.

According to some inherited memories in her mind, although she is a baby dragon and the smallest dragon, no matter how small it is, it is still larger than most creatures. If the other creature is larger than her, it is very likely that the other creature is also a dragon, or a close relative of a dragon.

He originally thought that there was too much mysterious power in his body and he couldn't feel the changes. Now he understood that this was only one reason. The most important reason was that the mysterious power contained too much energy!

"We are good friends, and I don't want you to be in danger!"

The first thing Zhang Feng did was to modify his own golden car, and sure enough, there was no problem.

After testing, Zhang Feng also found that the mysterious power in this mysterious crystal was too strong! The engine ran for several hours, but only lost a little energy, which was completely negligible.

In the airship, in addition to Zhang Feng and Hill, there are also Zhang Xiaotang and Windsor.

The dragon's nest is very large, with many holes inside. Zhang Feng is holding a high-intensity flashlight, but there is nothing he can do because he is the only one among the four who cannot have night vision.

"That won't work either!"

Zhang Feng looked serious.

Hill looked up with some dissatisfaction.

Therefore, Zhang Feng took the opportunity to say:

That is to say, if the mysterious power of a level one crystal is one unit, then the level two is ten units, the level three is one hundred units, and so on.

Looking back, when he was on the airship yesterday, Zhang Feng infused mysterious power into the engine and flew from the East China Sea all the way to Hongye City without feeling any fatigue.

The crystal mine was a little smaller than Zhang Feng expected, and it was mined out in one go, but Zhang Feng was already very satisfied. These fragmented crystals would be enough for him to use for a long time! Looking at the several large bags of crystals, Zhang Feng said with some pride:

Haha, I didn’t realize that the little red dragon is also a face control!

After hearing Windsor tell everything about the crisis yesterday, Hill became interested in the huge black shadow in the sea.

After solving the power problem, Zhang Feng felt that these mysterious crystals could have other uses. Soon, after he and Tina's research, a giant hammer inlaid with a transparent crystal appeared!

Bang! Amy took a giant hammer that was bigger than her and smashed it down without much force. The ground within a kilometer radius around her was cracked, and a big deep pit appeared under her feet!

“What power!”

Zhang Feng was a little surprised. He felt that the weapon should be given a name.

"From now on, this type of weapon will be called - Crystal Energy Weapon!"