The old man was very angry, and the old man was very angry.

Needless to say, Naraku was going to hand over the domineering seed directly to Mifune. Mifune could be said to be the first subordinate in the ninja world who was truly his own. He would definitely greatly strengthen his subordinates' combat power.

Naraku, who came to the forging room again, recalled the method of making the domineering seed. Then he found that the method of making this domineering seed was very simple.

Just draw the secret spell on the domineering cell, roast it over the fire and beat it hard. Then cool it down and take it orally.

This stunned Naraku, who had studied biology before. You should know that the size of cells on the earth used to vary depending on the species, from the smallest mycoplasma cell with a diameter of only 0.1-0.3um to the largest ostrich egg yolk with a diameter of up to 5 cm.

Naraku took out a domineering cell that was about the size of an adult male's head and fell into deep thought.

Moreover, the high temperature roasting and hammering in the manufacturing process were also very outrageous. For example, some normal cells and tissues in the human body can withstand a high temperature of 47°C.

Domineering cells can actually withstand such a terrifying high temperature of thousands of degrees. Naraku can only say that he, who is in the extraordinary world, doesn't understand biology.

Then Naraku sent out several high-level labor shadow clones to work together.

Naraku and the three clones first carved the secret spell on the domineering cells, and then the three clones were responsible for forging, and Naraku supported the high-temperature roasting.

Naraku looked at the still black domineering cells and knew that the roasting was not enough.

He could only perform fire escape next to him to heat up the domineering cells. Naraku thought that he needed to find a place similar to a volcano in the future, otherwise he would rely on ordinary coal to heat it every time, which would not meet the forging temperature requirements of some materials.

Three hours later, Naraku coughed twice.

The long period of fire escape made his throat look like he had just eaten the Death God pepper.

Naraku looked at the domineering cells in front of him that had become 10 cm in diameter. According to the inherited memory in his mind, the domineering cells were actually usable at this time.

Naraku thought: Why not let Mifune try? Just swallow the domineering seeds with a diameter of 10 cm.

Naraku finally didn't do the devil, because he was afraid that Mifune's larynx would be broken and he couldn't swallow this thing.

Another three hours later, Naraku's throat was almost numb at this time.

The domineering seeds had become smaller to a diameter of 5 cm. Naraku found that the more he forged this thing, the harder it was to forge it, especially when the temperature was not particularly high.

Although it still looks big now, Naraku believes that if Mifune tries hard, it should be enough. The average human on Earth can swallow objects of about 5.5 cm.

Now this thing is only 5 cm and this world is an extraordinary world after all, so it should be possible.

[The humble author issues a life-saving statement: Please do not try the dangerous behaviors that may exist in the above and below books. If something goes wrong, you will bear the consequences yourself! This is a supernatural world, ordinary humans should not imitate! ]

Naraku still thought that since Mifune had come, it would be unreasonable for him not to give him a good sword.

This time, Naraku took out the Ten Thousand Years Diamond Wood again. Before, Naraku had thought about adding some fancy materials to this Ten Thousand Years Diamond Wood, since Mifune's future domineering path has been determined.

Then he would not do those fancy things. This almost indestructible Ten Thousand Years Diamond Wood can become stronger step by step with Mifune's swordsman path, and eventually become his own supreme sword!

Naraku added a little decoration on the Ten Thousand Years Diamond Wood and marked it with the words Toyako.

Ding·····

[Congratulations to the blacksmith for forging the A-level weapon Toyako! 】

Naraku appraised the sword in his hand again:

【Toyako (A-): This sword was forged by the forger imitating Gintama's favorite sword Toyako. It uses the ten thousand year old diamond wood, and no effort was put into it. Just a little decoration and marking.

Although it is a wooden sword and has no blade, it can still pierce people. There is the word "Toyako" on the wooden sword.

This sword is 1.4 meters long and has the characteristic of "solidity". It can smoothly conduct chakra and other energy. 】

Naraku ignored some of the ironic words of the system. This system knows nothing. Not using other materials is to not disgrace this ten thousand year old diamond wood!

And only using this ten thousand year old diamond wood can also show the solidity of the materials! How can this wise system understand his deep meaning!

As for why it is not sharpened, Naraku said that the difficulty of sharpening this thing is no less than holding a screw

It is almost impossible to grind steel into a needle with a roadside stone.

In short, have you ever seen a forger who can forge an A-level weapon in 2.5 minutes?

What is the international ultimate invincible forger! Naraku's tactical retreat!

·······

The next day, in the reception room of the Uchiha clan, Mifune looked at Naraku respectfully.

Naraku pretended to put his hand into his trouser pocket, but actually took out the domineering seed in the system space, and then Naraku handed the domineering seed to Mifune.

At this time, Mifune's expression was a bit weird, because from his perspective, his boss took out a black iron egg from his crotch and handed it to him.

Naraku did not notice Mifune's micro-expression, but said calmly with a little smile: "Mifune! The answer you want to save the Iron Country is in this ball. Swallow it!"

Mifune was also entangled for two seconds, but thinking of being able to save the Iron Country, he still swallowed the 5-centimeter diameter ball despite the discomfort.

What surprised Mifune was that the iron ball he swallowed disappeared after entering his body. He didn't feel any discomfort, but he didn't feel any stronger.

Naraku looked at Mifune and saw that there seemed to be no change in Mifune. He knew that Mifune needed a little stimulation.

So Naraku pulled Mifune to eat barbecued sea kings.

Although Mifune didn't understand why Naraku did this, he felt that Naraku must have his deep meaning.

After the two of them finished eating barbecue, Naraku told Mifune: "I'm going to give you a powerful weapon! You will grow with this weapon in the future!"

This made Mifune feel hot in his heart. Which swordsman doesn't want to have a weapon that can grow with him?

When Naraku handed Lake Toya to Mifune, Mifune was a little numb.

This looked no different from the wooden swords that children like to play with, except that Lake Toya was engraved on it, which made Mifune wonder what it meant.

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