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Behind the inn is an open space, which used to be an abandoned hut.

Lin Feng cleared out the clutter inside, moved an anvil in, and borrowed a practice hammer from Shen Wanchui.

The hammer is not heavy, weighing only about 100 pounds, much lighter than the one used for formal forging.

Shen Wanchui said to practice with this first, and not to go all out with anything big right away.

first day.

Lin Feng retrieved the parameters for the first stage from the blueprints, used his mental power to control his right arm, and brought the hammer down.

clang!

There is an extra dent on the iron billet.

Shen Wanchui stood to the side, holding a spirit pattern measuring device in his hand, and glanced at the data of the dent.

"The angle was off by 0.3 degrees, but the force increased by 2 pounds."

Lin Feng adjusted his stance and struck the second blow.

"The angle is right, and the force is reduced by a pound and a half."

The third strike.

"The force was right, but the frequency was 0.02 seconds slower."

All three parameters must be correct simultaneously; missing even one will not work.

Lin Feng played for two hours.

The iron billet transformed from a square strip into a twisted lump of scrap iron.

Shen Wanchui threw the scrap iron into the basket in the corner and took a second piece from the shelf.

"continue."

In the afternoon, the second iron billet was also ruined.

In the evening, the third piece.

When Lin Feng put the hammer down, the muscles in his right arm twitched slightly.

The continuous high-intensity output of mental energy consumed more than he had anticipated.

Shen Wanchui squatted in front of the stove, turning the embers with fire tongs, without even looking up.

Come again tomorrow.

"Um."

Lin Feng hung the hammer back on the wall and left the forge.

The earth dragon lay outside waiting, its tail sweeping across the ground twice.

The eagle glided down from the sky and landed on the dragon's back.

On the way back to the inn, Lin Feng closed his eyes and reviewed the situation.

The three iron billets were scrapped for different reasons.

The first issue is that the mental power's control over the arm muscle groups is not precise enough.

Fine-tuning the angle requires manipulating more than a dozen muscle fibers simultaneously, three of which have a slow response time.

The second issue is the control of force.

When the hammer falls from a height, the force at the moment of contact with the iron billet will be relatively large due to the acceleration. It is necessary to reduce the force just before the hammer hits the billet.

The third element is frequency.

The rhythm of two strikes per second sounds simple, but when the angle and force change simultaneously, the rhythm can be disrupted.

All three problems need to be solved.

He mentally reviewed the solution and stored it in his memory.

Back at the inn, I took a shower and sat cross-legged on the bed to practice my internal energy.

Lin Feng didn't think much of it and closed his eyes to conserve his energy.

the next day.

When Lin Feng arrived at the forging workshop, Shen Wanchui had already prepared the new iron billets.

Four pieces, arranged in a row.

"I wasted three yesterday, so I prepared one extra today."

Lin Feng didn't reply, and picked up the hammer.

The first hammer fell.

Shen Wanchui's measuring instrument scanned the area.

"...Passed."

The second blow.

"Passed."

The third hammer blow, the fourth hammer blow, the fifth hammer blow.

All passed.

Shen Wanchui raised his eyebrows slightly.

Yesterday, the probability of all three parameters meeting the standard simultaneously was less than 40%, but today it's 100%.

After sleeping through the night, is this the kind of progress a human should make?

Lin Feng didn't notice his expression and kept his head down, working on the iron.

I used my mental energy to number each muscle fiber in my right arm, and I specifically strengthened the three slower-responding groups during my exercises last night.

The point at which the force was released was advanced by 0.03 seconds.

Frequency uses mental energy to incorporate a metronome, with each strike occurring at an interval accurate to one-thousandth of a second.

An hour has passed.

The shape of the iron billet is starting to resemble something.

It was no longer a twisted piece of scrap metal, but a rough but well-formed cylinder.

Two hours.

The surface of the cylinder became smooth.

Shen Wanchui put down the measuring instrument, his hands no longer trembling.

By the afternoon, all the parameters for the first phase had been run once.

The iron billet was not wasted.

"Switch to the second phase."

Lin Feng changed his grip on the hammer.

Shen Wanchui took a new iron billet from the shelf and handed it over.

In the second stage, the force increases, the angle changes from 90 degrees to 87 degrees, and the frequency changes from two hammer blows per second to 2.3 hammer blows per second.

The difficulty level has increased significantly.

But Lin Feng's mental energy had already heated up.

The control precision is even higher than in the morning.

clang!clang!clang!

The frequency of the hammering sound was noticeably faster to the naked ear.

The intervals between each beat have shortened, but the rhythm is frighteningly steady.

Shen Wanchui stood to the side, holding the measuring device up for a while before putting it down.

Because there is no need to test anymore.

The data for each hammer blow were within the acceptable range.

By evening.

The second phase is over.

The iron billet was not wasted.

Shen Wanchui looked at the two intact practice pieces on the worktable and opened his mouth.

They didn't say anything.

He took the four spare iron billets back from the shelf.

"Come tomorrow and go straight to stages three through ten."

"OK."

Day three.

Raymond Lam arrived earlier than the previous two days.

Shen Wanchui had already heated the furnace, the iron billet was glowing red, and he was holding it with fire tongs and waiting to the side.

"You'll be playing continuously today, from the third to the tenth stage without stopping. Once you finish, you've passed."

Lin Feng took the hammer and stood in front of the anvil.

I took a deep breath.

His mental energy fully expanded, covering all muscle groups in his right arm from the shoulder joint to the fingertips.

The first strike.

clang!

The hammering never stopped once it started.

The third stage involves a force of 400 kilograms, an angle of 83 degrees, and a frequency of 2.5 hammer blows per second.

In the fourth stage, the force is 480 kilograms, the angle is 79 degrees, and the frequency is 2.7 hammer blows per second.

The parameters changed, but the rhythm of the hammering remained unchanged.

Shen Wanchui took the measuring device out of his pocket and then put it back in.

He simply moved a chair over and sat down to watch.

Phase 5, Phase 6, Phase 7.

The force exceeded 500 kilograms, the angle dropped to below 70 degrees, and the frequency was close to three hammer blows per second.

The shape of the iron billet changes continuously on the anvil.

It transformed from a cylinder into a long strip, and then gradually narrowed into a rod with a subtle curve.

Phase 8.

There is a challenge here.

The changes in force and angle are in opposite directions.

The force is increasing, the angle is decreasing, but the frequency needs to be adjusted back.

With the three parameters pulling in different directions, mental strength must simultaneously control the two muscle groups, one for contraction and the other for extension, to perform opposite movements.

The rhythm of the hammering sound had a very slight pause.

Shen Wanchui lifted his buttocks off the chair.

With the next strike, the rhythm was restored.

Shen Wanchui sat back down.

Phase Nine. Phase Ten.

The final hammer fell.

clang.

The lingering sound lingered in the forge for two hours before dissipating.

An iron billet lay on the anvil.

The surface is smooth, the curvature is smooth, and the texture of the cross-section is so uniform that the difference is almost imperceptible to the naked eye.

Zero errors.

Shen Wanchui stood up from his chair, walked to the anvil, and stared at the iron billet for a full half minute.

"Three days."

He raised his head.

"My son studied for ten years before reaching your current level of proficiency."

Lin Feng put down the hammer and stretched his wrists.

"Your son is not a spiritual practitioner."

"...That's true."

Shen Wanchui dusted off his hands and walked to the giant black furnace in the inner room.

My hand is on the valve of the furnace door.

"Start the furnace tomorrow."

When Lin Feng came out of the forging workshop, it was already completely dark.

The earth dragon and the fierce vulture waited outside. After the temperature dropped, the fierce vulture no longer flew so high.

On the way back to the inn, my communicator vibrated.

Mr. Zhou.

"Qian Weiguo's encrypted signal was intercepted a second time."

Lin Feng put the communicator away.

We arrived at the inn.

I pushed open the door, turned off the lights, took a shower, and sat on the bed to practice my internal energy.

The exercise lasted for about twenty minutes.

The mental energy detected the changes outside the inn.

Three auras.

They came from the west, moving slowly, deliberately keeping their speed low.

Martial Saint, Fourth Stage.

They were not the same group as the two "passersby" who had followed them before.

These three people have completely different blood and qi characteristics, and they have a sense of evenness that comes from systematic training.

He came from a regular military background.

The three of them did not enter the inn.

It stopped in the alley behind, its breathing almost completely stopped, and lay motionless.

Lin Feng did not open his eyes.

I waited for ten minutes.

One of them moved.

The footsteps circled the side of the inn and reached the main entrance.

There were two knocks on the door.

Lin Feng opened his eyes.

"Come in."

The door opened.

A woman. In her early thirties, quite tall, wearing a dark gray trench coat, her hair tied in a neat ponytail at the back of her head.

"Lieutenant Lin."

She bowed slightly.

"Su Wanqing, Vice Minister Qian sent me."

She took a sealed envelope from inside her trench coat, took a couple of steps, and placed it on the table.

"Vice Minister Qian said that the sincerity of the cooperation is evident in this."

Lin Feng did not reach out.

I scanned it with my mental energy first.

The envelope contained a thin piece of paper, with no trace of toxins.

Clean.

He opened it.

The paper contained a set of latitude and longitude coordinates, with a line of text below:

"Here you find the quenching medium, Xuanming Cold Iron Molten Iron, which you require. Respectfully submitted by Qian Weiguo."

Lin Feng's finger stopped on the five characters "Mysterious Nether Cold Iron Water".

This thing is indeed mentioned in the forging manual.

After the Star Dragon Bone Essence is forged at a high temperature of 36,000 degrees Celsius, the quenching process requires an extremely yin and cold medium to neutralize the residual violent spiritual energy inside.

The Xuanming Cold Iron Molten is the optimal solution.

Before he could even go looking for it, Qian Weiguo had already delivered it to his lips.

This person had a deeper understanding of the secret realm than he thought.

"Please thank Vice Minister Qian for me."

Lin Feng folded the note in half and put it into his storage ring.

Su Wanqing nodded and turned to walk towards the door.

I stopped at the door.

"By the way, Lieutenant Lin."

She turned halfway around.

"Vice Minister Qian asked me to pass on a message: the waters in the Northwest run deep, and there are some things that one person cannot swallow alone."

After saying that, the door closed.

The footsteps faded into the distance.

The three figures, one in front and two behind, left the alley and disappeared in the southeast direction.

Lin Feng sat on the bed and read the note again.

The coordinates point to the depths of the wasteland, approximately eighty kilometers from the entrance to the secret realm.

He took out his communicator and sent the coordinates and the contents of the note to Old Zhou.

The reply arrived in one minute.

"Coordinates confirmed. There is an underground cold spring there, recorded in the military geological archives, top secret, and it has never been developed."

"Qian Weiguo's ability to produce this indicates that he has access to a top-secret geological archive."

"Be careful when you go to get the molten cold iron; there might be an ambush."