After passing through those few crystal pillars with amazing aura, Chu Yun saw a passage that could accommodate four or five people walking side by side.

There are about two dozen stone doors densely packed on both sides of the passage, and this is the refining room rented out by the Fire Society.

Glancing at the token in his hand, Chu Yun chose one of the stone doors, fastened the token to the recessed part of the stone door, and opened the stone door with a gentle push.

Suddenly, a scorching wave of qi rushed to his face, feeling the temperature emitted by this wave of qi, Chu Yun nodded secretly, it seems that the earth fire veins here are not bad, and they can be called middle and upper level.

This stone chamber is not very large, only about a few zhang in size, and the whole body is made of an unknown black rock, and in the center of the stone chamber there is a small furnace connected to the earth fire veins.

The furnace was milky white and had a simple shape, surrounded by dense inscriptions, and a dark purple flame emerged from the furnace, and the terrifying temperature distorted the air around the furnace.

There was nothing but the furnace and the casting table in the stone chamber.

After closing the door of the stone room, Chu Yun took out the high-grade refined iron that Ouyang had given him from the storage bag, and then Chu Yun's eyes fell on the furnace, only to see that the dense runes on the furnace exuded a faint fluctuation of spiritual power.

"It's actually a fire gathering array, it seems that there are still masters in this fire club. A hint of surprise flashed in Chu Yun's eyes, and he nodded with satisfaction, with the help of this formation, he could better exert the effectiveness of the earth fire.

After observing for a moment, Chu Yun no longer hesitated, took out two fiery red spirit stones from the storage bag, and inlaid them on the two formation eyes of the formation on the furnace.

Bang!

Suddenly, the formation runes on the furnace suddenly brightened, emitting bursts of scorching light, and at the same time, the power of the flames in the furnace also shook suddenly, shrinking a few points, but the flames became more pure, and the temperature emitted suddenly increased by a few times.

Chu Yun, who was standing next to the stove, felt that the temperature around him had suddenly risen a lot, and beads of sweat the size of beans rolled down from his forehead and cheeks from time to time, but he seemed to be unconscious, his eyes were firmly fixed on the flame in the furnace.

Suddenly, Chu Yun's eyes lit up, and he suddenly threw a few pieces of refined iron in his hand into the furnace, and the flame temperature at this moment had stabilized, which was just right for starting to forge refined iron.

Time passed little by little, and after half an hour, the refined iron in the flame had been quenched by the earth's fire, and the tiny impurities continued to fall off from the surface, making bursts of crackling sounds.

At the same time, Chu Yun's face also began to become a little solemn, his eyes stared at the changes in the fine iron, and after a while, finally there were no more impurities falling off, Chu Yun's eyes suddenly widened, and he grabbed the tongs, clamped the fine iron away from the furnace, and put it on the casting table on the side.

Immediately after that, his hands kept pinching like wheels, and one after another light blue true elements began to frantically rush into the fine iron, they seemed to be chaotic and chaotic towards the fine iron, but when they fell on the fine iron, they formed a sophisticated formation.

"Drink!" After hitting the last rune, Chu Yun let out a low sigh, stretched out his hand to pick up the hammer on the side, one hand firmly clamped the fine iron with fire tongs, and the other hand quickly rotated the iron hammer, constantly beating and beating the fine iron.

For a while, there was an incessant percussion sound in the stone room, and if someone listened carefully, they would find that this seemingly noisy sound, whether it was the frequency or the size, was exactly the same!

This is a great test of the forger's control of power, and it is necessary to make sure that the power of each hammer is the same, one point heavier, and one point less light.

In this way, Chu Yun had been forging these pieces of refined iron all afternoon, in fact, they had already been completely fused together, but Chu Yun deliberately tempered for a while in order to pursue perfection.

At this moment, there was no trace of the fine iron in the stone room, only a red war knife, lying quietly on the casting platform, while Chu Yun was already exhausted and sitting cross-legged on the ground meditating and breathing.

After about an hour, Chu Yun's breathing gradually became smoother, and his sweat-soaked clothes were also dried in the hot environment in the stone room.

Chu Yun stood up, held the forged war knife in his hand, felt it, and nodded with satisfaction, after thousands of tempered war knives, the blade was completely natural, and there was no trace of man-made man-made, and several pieces of fine iron were also perfectly fused together.

It's just a pity that this war knife is just an ordinary weapon, and its power is far less than that of a magic weapon.

However, Chu Yun did not have the slightest expression of loss on his face, but threw the forged war knife into the furnace again, and then stared intently at the change of the battle knife.

Under the terrifying temperature of the earth fire, after a while, the war knife became extremely red, and Chu Yun, who had been standing by the stove, saw this scene, wiped the sweat on his face, and a trace of joy flashed in his eyes.

When the war knife was cast, several inscription formations had been laid out, and the effect of these formations could make the war knife more tenacious and not easy to deform, as long as the deformation would not occur during the second tempering, it would be considered half the success.

A moment later, Chu Yun used fire tongs to take out the extremely red war knife that had been quenched from the furnace and put it on the casting table, and then Chu Yun took a deep breath and silently ran the exercises, gathering all the true elements between his two fingers.

Suddenly, the two fingers of Chu Yun's right hand emitted bursts of red light, and then he wrote with his hand, pointing at the crimson battle knife, which had been tempered by the earth fire for a long time, and under the blessing of the true yuan in Chu Yun's body, it immediately sunken into it like a lake.

An incredible scene appeared, only to see Chu Yun's wrist rotate heavily and flexibly, at this moment, his eyes had already turned fiery red, staring closely at the runes on the battle knife.

As time passed, one rune after another slowly appeared on the blade, and after a full hour had passed, Chu Yun finally stopped, and there were nine runes, forming a complete set of attack formation runes.

When Chu Yun finished his last stroke, a faint layer of red light suddenly appeared on the entire knife body, emitting a scorching fire attribute fluctuation.

Chu Yun showed a look of joy on his face, gasped for breath, held the battle knife engraved with runes in his hand, and said to himself: "Although it is only a low-grade magic weapon, under the full power of the nine runes, combined with the power of the flame chain slash, I believe it is enough to shake the existence of the early stage of the Xuan Rank, and it is even possible to kill it with a direct blow!"