No wonder the original furnace could only reach 1,700 degrees. Its grade was not high enough.

Now, he had enough points, and his spirit power had been upgraded a few times, meeting the furnace’s upgrade requirements.

Once the furnace was upgraded, the temperature ceiling would be raised and the impurities in the molten iron would be successfully removed!

Furthermore, a Premium-grade Furnace could save spirit power. It was a well-spent 1,000 points!

Wu Mo was a little excited. He looked at the furnace surrounded by green light and was eager to try it.

Five minutes passed in the blink of an eye.

When the time was up, the green light on the surface of the furnace slowly disappeared.

Then, the appearance of the successful internal upgrade was revealed.

Wu Mo stood at the side and observed it carefully, discovering many different changes.

The size of the furnace had almost doubled, and there were eight more burners. Its interior was much more spacious, and its surface0 glowed with a metallic luster. It was much more exquisite than before.

Seeing that the furnace’s upgrade was complete, Wu Mo immediately began his unfinished work.

In the tungsten bowl at the center of the furnace, the molten iron, which had been refined previously, had already solidified. There was still a lot of gray matter on the surface. Clearly, his refining work from before had returned to its original point.

Wu Mo walked forward and placed his hands on the mouth where he could observe the flame. Then, he focused his gaze. Soon, the spirit power in his mind poured into the furnace.

Bang!

A red flame materialized in the furnace and directly swallowed the molten iron at the center.

As he poured his spirit power into it, the temperature in the furnace grew higher and higher.

Soon, it broke through the original 1,700 degrees.

At that moment, Wu Mo was pleasantly surprised to find that the spirit power used to break through the temperature ceiling was much smaller. It should be thanks to the Premium-grade Furnace’s additional effect.

A smile formed at the corner of Wu Mo’s mouth. He quickly calmed his mind and raised the temperature again.

Two thousand!

Two thousand and five hundred!

By the time Wu Mo felt a little exhausted, the flame’s temperature had already reached 2,500 degrees. The temperature probe outside had rotated nearly twice, and the flame inside had also slowly turned yellow. The air in the furnace had been steamed and distorted.

Meanwhile, the molten iron had already shrunk by more than half. The large iron ball’s original weight had been nearly 300 kilograms, yet after the first refining, it was only less than 60 kilograms.

Now that the remaining molten iron had been roasted at 2,500 degrees, the interior had already begun to boil intensely. Many impurities had been excluded, and only half of its weight remained.

However, producing such a high temperature consumed a lot of spirit energy. Wu Mo’s current spirit energy was still within the standard of a four-star blacksmith, so he could not hold on for long.

After ten minutes of roasting, Wu Mo realized that the molten iron still had not reached its purest state, so he had no choice but to give up.

As he poured the molten iron into the crucible, it bubbled and boiled continuously.

Right then, Wu Mo had no other choice but to pour the membrane over it first.

He poured the molten iron into the mold that had already been adjusted.

The boiling molten iron entered the mold, burning the mold, which was made of a special metal, until it was red. Wu Mo then grabbed the other half of the mold and assembled it completely. Then, he immediately threw it into a large bucket of cooling liquid.

With a loud sizzling sound, white smoke immediately rose and blocked his vision.

Wu Mo heaved a sigh of relief. Looking at the bubbling cooling pool, he shook his shoulders and prepared to warm up.

About ten minutes later, Wu Mo fished the mold out of the cooling liquid. First, he picked up the hammer used for forging and hammered around the mold. Next, he opened the sealed mold.

At this time, the molten iron inside had completely condensed into a black long rhombus with four corners.

The rhombus-shaped hammer was 45 centimeters long and 26 centimeters wide. It was about 15 centimeters thick and weighed 18 kilograms.

After he removed the mold, he laid the black rhombus on the workbench. It did not look like a Divine artifact at all.

“Finally, I’ve made some progress. I hope what I did was right.”

Wu Mo pursed his lips. After thinking for a few seconds, he immediately picked up the three-dimensional rhombus-shaped object and threw it into the furnace.

Clang!

The metal of the iron block and the furnace body collided with each other, creating a series of sounds.

Wu Mo did not hesitate and immediately began the process of tempering the hammer.

The hammer was only a rough iron block; it was a semi-finished product. If he wanted it to produce an effect, it had to be tempered at least three times!

The flame rose again, but this time, it only needed to be tempered. The temperature did not need to exceed 500 degrees for Wu Mo to easily complete the calcination. It took about ten minutes for it to return to the furnace.

At this time, the black iron block had already been burned until it was completely red. Wu Mo immediately removed the bottom plate and placed it on the iron felt. Then, he picked up the hammer and struck it.

The hammer was raised high, and then it fell heavily. The two collided, causing countless sparks to fly.

Only a series of tinkling sounds could be heard.

Wu Mo held the hammer tightly, and with great effort in his heart, he knocked on the iron block five hundred times in one go.

The size of the iron block was further compressed, and the irregular bumps on the surface became smooth.

After doing all this, Wu Mo threw the iron block into the furnace again, quenched it, and then forged it again. This process lasted three times.

The entire iron suddenly became smooth, and it looked more like a hammer. However, if he didn’t press on the handle of the hammer, he still couldn’t tell what it was.

At this time, Wu Mo was already drenched in sweat. His right hand, which was holding the hammer, unwittingly trembled slightly.

He had already undergone more than a week of physical training, but his endurance was still too poor. He could not forge more times!

Hiss…

Wu Mo took a deep breath and looked at the iron piece that had shrunk by one circle. He was ready to rest for a while before proceeding to the next step.

The prototype had been made, but it was still far from the real Mjolnir.

After fusing the Legendary Essence, drawing the magic array, and embedding the ore, he would need to strengthen his attributes and bind it with the highest level of blood.

After going through the steps in his mind, Wu Mo turned around and focused on the golden light on the workbench.

Legendary Essence!

This was a very important material.

Wu Mo walked forward and held the Legendary Essence in his hand. The golden light sparkled. Wu Mo narrowed his eyes slightly. He first placed the Legendary Essence beside the iron block. Then, he immediately took out the advanced forging pen and paper that the tenth elder had given him.

The ten-centimeter-long forging pen was engraved with circles of purple patterns. The light turned into faint ripples and spread out. With just a casual glance, Wu Mo knew that this thing was definitely not an ordinary object, it seemed to be even better than the high-quality ones he had seen in the materials shop before.

However, Wu Mo was not in the mood to study the grade of the forging pen and paper. He immediately unfolded the forging paper and began to draw a Spirit Transformation Array on it.