Five fifteen or sixteen-year-old boys, shirtless and wearing leggings made of cowhide, held hammers in both hands, and slammed the red-hot steel ingots on the anvils.

The sledgehammer was heavy, and it smashed on the steel ingot, and countless sparks erupted, that is, the impurities in the steel ingot were blasted out with great force, and the steel ingot was gradually becoming pure.

A dozen or a dozen younger teenagers were helping the five teenagers, they were so hot that they were covered in sweat, but they did not dare to carelessly carry the heavy iron tongs and constantly turn the steel ingots on the anvil.

The young men who struck the iron were sweating like pulp, they gasped lowly, the hammer in their hands continued to smash down with a strange frequency, their breathing was heavy and long, and between breaths and breaths, their chests and abdomen were rising and falling rapidly.

Beside the teenagers, five roaring stoves emitted a formidable heat. In each furnace, Chu Tian buried a soybean-sized fire attribute spirit crystal, and under the stimulation of high temperatures, a trace but pure amount of heaven and earth spirit essence continued to seep out of the spirit crystal.

Chu Tian's soul thoughts enveloped the entire blacksmith shop, and these heaven and earth spirit essence was divided into more than twenty wisps, which slowly infiltrated into the bodies of these apprentices.

The apprentices operated the "Nine Heavenly Furnace Method" taught by Chu Tian on their own, and the high temperature emitted by the burning coals in the furnace, as well as the heaven and earth spirit essence emitted from the small spirit crystal, were continuously inhaled into their bodies.

Their skin was as red as coals.

The heat in their bodies was tumbling, the hot air exercised their internal organs and flesh meridians, and as they moved, there was a faint trace of gray impurities in their shiny sweat.

Slowly, but very firmly, the impurities in the bodies of these apprentices were tempered by the Nine Heavenly Furnace Method, and their flesh and bones became more pure and pure, and their strength increased little by little.

In the courtyard behind the blacksmith's shop, more than two dozen stoves were burning, and next to each stove was a pair of iron-striking tools, and more than two dozen young children, ranging from seven or eight years old to eleven or twelve, carried small hammers, gritted their teeth and smashed the small iron blocks on the anvils as well.

These children are young, they don't have much strength, they haven't cultivated before, and they haven't taken any pills to assist in cultivation. Compared to the five teenagers who served as a façade in the blacksmith's shop, these children had a much worse foundation.

If the foundation is poor, there is a teaching method with a poor foundation.

These teenagers outside can already forge steel ingots and refine better steel, and these children in the backyard can't do anything else if they want to, but according to the ratio given by Chu Tian, it is still quite competent to use small crucibles to refine some special alloys.

These children smashed a piece of iron, sitting on the doorway between the front shop and the backyard, Chu Tian, who was drinking with Erlang's legs crossed, looked up at the sky, and drank lightly: "The fire is coming, take the mold, be careful, inject the molten iron into the mold!"

A group of children dropped the hammer in their hands, gasped heavily, and without saying a word, picked up the iron tongs next to the anvil, and carefully took out the hot crucibles that emitted a piercing heat from the red-hot furnace.

The mold had been prepared next to the stove, and the children gritted their teeth, lifted out the crucible weighing dozens of catties and the alloy juice inside, and carefully poured the alloy juice into the mold.

Sparks splashed in all directions, more than two feet high.

The children were dressed in leggings made of animal skins, and the sparks splashed on their legs, which only made them sweat a little more, and did not hurt them in any way.

After a short while, all the alloy juice was injected into the mold, Chu Tian waved his hand and said in a deep voice: "Okay, sit on the ground immediately and practice the exercises taught by the master." Hey, it's about your future achievements, don't be lazy!"

Chu Tian stood up, carrying a leather whip with thin wire wrapped around the surface, and walked slowly to the children's side.

The children didn't dare to slack off, they hurriedly sat down next to the mold that constantly emitted terrible heat, pressed their left hand on their chest, pressed their right hand on their lower abdomen, and began to practice the Nine Heavenly Furnace Method according to the breathing method taught by Chu Tian.

Wisps of hot air continued to seep into the bodies of these children, and seeing the white gas rising from the top of their heads, the breath of many children became extremely heavy, and the breath from their mouths was extremely hot, if they put a thin piece of white paper in front of them, they were afraid that the white paper would burn out of thin air.

Chu Tian nodded with satisfaction.

The children introduced by several shopkeepers around are all dolls from simple and good families.

None of them were lazy and slippery, and none of them were scheming, and it had been seven or eight days since they were taken in, and no matter what Chu Tian told them to do, these children could do it well.

"Not bad!" Chu Tian nodded with satisfaction.

Looking at these children who were running the exercises wholeheartedly, Chu Tian flicked his fingers, and a piece of crimson top-grade spirit crystal appeared in his hand. With a force on the thumb and index finger of his right hand, the spirit crystal was crushed alive, and Chu Tian picked out more than two dozen of the tiniest fragments and threw them into those furnaces one by one.

A powerful voice came from inside the blacksmith shop: "Master Strong, Master Strong, we brought a few good brothers here, hey, can you build a strong bow? At least a strong bow that can withstand 300,000 catties of strength, if so, you can pay as much as you want!"

Chu Tian narrowed his eyes.

A strong bow with 300,000 catties of strength?

The heavenly court, weights and measures here are also in line with the heavenly and land worlds, and it seems that there is a mysterious force that unifies the weights and measures of the two worlds that are incomparably far apart. The strength of 300,000 catties is just the level of ordinary three dragon powers!

A bow that can withstand this bit of strength can also be considered a strong bow?

Smiling slightly, Chu Tian walked into the blacksmith shop in front of him unhurriedly, and smiled at the big man who came to build the Santing machete last time: "Yes, why can't it?" It's just that the strong bow that can withstand 300,000 catties of strength, my materials here are not good, if a few heroes can find some good materials......"

Several tall men with arms that were longer than ordinary people nodded hurriedly with a smile and untied several huge packages from behind.

After a while, Chu Tian had a few beast horns exuding a powerful aura, a few python main tendons, and a pile of black and heavy metal ores in front of him.

Chu Tian grabbed the horn and broke it, then picked up a main tendon and pulled it hard.

With a 'hum', the main tendon was beating violently, and Chu Tian used millions of catties of strength, but he couldn't pull the main tendon.

"Good materials, just used to forge a bow of 300,000 catties, it is a waste! If you make a move, I will forge a good bow of 600,000 catties for you, how about it?" Chu Tian smiled and looked at a few sturdy men.

Several men were ecstatic and hurriedly bowed deeply to Chu Tian.