Xiao Yuan deliberately left Han Yu for two days as if he knew that Han Yu was going to refine Huogang Thunder, and Han Yu naturally would not miss this opportunity, and after cultivating his spirit, he came to the underground cave under the Qingyi Peak again. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

"The rent of the mid-tier earth fire room is five lower-grade spirit stones a day, you are a qi refining period cultivator, are you sure you need it?" When Han Yu proposed to rent the mid-tier earth fire room, the white-haired old man showed a suspicious expression.

"Is there a problem? I just need to rent for a day. Han Yu replied calmly.

"If you insist on renting, there's no problem. Although the white-haired old man was curious, he still took out a key from the storage bag and handed it to Han Yu.

"No. 12 Medium-Tier Earth Fire Room, you just go all the way down, below all the low-level rooms, I would like to remind you that the temperature of the medium-tier Earth Fire is very high, and even the slightest carelessness during the foundation building period may cause injury, so you should pay attention yourself. ”

"Thank you. Han Yu nodded, took the key, and handed the five lower-grade spirit stones to the white-haired old man.

Soon, after walking through all the low-tier earth fire chambers, the No. 1 medium-tier earth fire chamber appeared in front of Han Yu, and after Han Yu continued to walk down a few steps along the inclined cave, he came to the door of the twelfth medium-tier earth fire chamber.

This place was already a few hundred meters underground, surrounded by earth fire magma near the rocks, and the temperature in the air was surprisingly high, Han Yu took a deep breath and walked into the middle ground fire room after blessing a protective talisman on his body.

The layout of the middle-level ground fire chamber was about the same as that of the low-level ground fire chamber, and after Han Yu sprinkled a handful of ignition sand at the mouth of the ground fire, a blazing earth fire suddenly jumped up.

Han Yu took out the brocade boxes one by one from the storage bag, placed them in front of him, and after simulating the entire process of refining Huogang Thunder in his heart, he opened the first brocade box in front of him.

What was placed in the brocade box was the fire attribute demon pill of the foundation building period that Han Yu had exchanged in the fang market, this demon pill was only the size of a pigeon's egg, and the whole body was fiery red, but in the underground where the fire aura was so abundant, the fire aura attached to the demon pill itself was almost incomprehensible.

Han Yu used his spiritual power to control the demon pill and transferred it to the earth fire.

"Zizi~"

The demon pill soon made a strange sound, and if it took a few more seconds, this demon pill would be directly refined by the earth fire.

Han Yu didn't dare to hesitate, quickly opened another brocade box, and threw a piece of dark green ore placed in it directly into the ground fire.

"Boom~"

As soon as the dark green ore entered the earth fire, it quickly melted and turned into a whole mass of liquid, enveloping the fire attribute demon pill in the middle.

At this time, because of the addition of dark green ore, the color of the earth fire changed from pure and dark red to a color mixed with red and green.

As a result, the temperature of the earth fire was faintly reduced by a few points compared to just now.

The Fire Gang Thunder that Han Yu was refining now was a simplified version of the Fire Refining Technique, and he didn't dare to refine the enhanced version recorded in the Nameless Exercise as soon as he came up.

With Han Yu's current refining level, refining a simplified version of Huogang Thunder is a very reluctant matter, and risking to refine a strengthened version of Huogang Thunder is no different from sending materials.

After about a minute, the original dark green color of the metal liquid gradually faded and turned into a light green, and the demon pill surrounded by the metal liquid actually dissolved like an ore, if it were not for the surface still wrapped in a thin film, it is estimated that it would collapse directly.

Han Yu carefully controlled the fiery red liquid demon pill in the middle, and under the subtle control of the spiritual power, a hole was slowly opened in the middle of the liquid demon pill.

"This is the time!"

Han Yu's eyes lit up suddenly, and he quickly picked up the third brocade box, controlled the fine transparent spar in it with spiritual power, and carefully transported it to the inside of the demon pill through the broken opening.

These finely fragmented transparent crystals, after entering the liquid demon pill, slowly condensed into a ball.

"......"

The surface of many transparent crystals, under the high temperature, slightly flashed a few small silver arcs.

Seeing this scene, Han Yu's expression became more and more serious, and his eyes were firmly fixed on the inside of the liquid demon pill, not daring to relax in the slightest.

Gradually, these fine fragments of transparent crystals fused into a circular sphere at high temperatures, and the silver arcs on the surface began to submerge into the transparent crystals.

"The last step......"

On Han Yu's forehead, many fine beads of sweat began to appear, obviously, refining Huogang Thunder had reached the most critical juncture.

Taking advantage of the moment when the transparent spar fused, Han Yu hurriedly took out the Yuan Armor Shield from the storage bag and protected it around him.

If the last step failed, the power generated by the unfinished Huogang Thunder explosion would be enough to smash Han Yu, who was unsuspected, to pieces.

Seeing that the last trace of silver arc had submerged into the transparent spar, Han Yu opened the last remaining brocade box in front of him.

In the brocade box, there is a vial made of white jade, and the contents of this vial, in terms of value alone, are not much lower than the demon pill in the foundation building period.

Han Yu took a deep breath, didn't bother to wipe the beads of sweat that fell from his forehead, and tore off the seal of the white jade vial.

As soon as the seal was opened, bursts of white mist floated out of the mouth of the bottle, and those few faint wisps of white mist faintly lowered the temperature of the air in this earth fire room by a few points.

"The cold marrow of the snow frog in the foundation building period is really extraordinary......

After a slight pause, Han Yu picked up the white jade vial, poured out a drop of snow-white cold pith from it, and separated a part of the metal liquid in the middle, which had turned pale green, wrapped the cold pith and sent it to the demon pill.

At this time, the wound on the surface of the liquid demon pill gradually began to heal, and just when there was only a thin slit left, Han Yu suddenly removed the metal liquid wrapped around the cold marrow, causing it to fall right on the thin slit on the surface of the liquid demon pill.

"Squeak ......"

In an instant, the white mist filled the air, enveloping the entire liquid demon pill, one ice and one fire, and the two attributes that were originally born with each other were slowly fused at this time.

"Don't make a mistake......

At this time, Han Yu's whole heart was lifted, lest there be a little mistake in the process of integration.

"呲呲~"

At the beginning, the fusion process was very smooth, but when most of that drop of cold marrow entered the liquid demon pill, the entire demon pill actually began to swell irregularly.

"Hold it down!"

Han Yu's eyes were cold, and the fire spiritual power in his body directly penetrated the pale green metal liquid, enveloping the liquid demon pill.

As long as you pass this level, then this Huogang Thunder can be regarded as a successful refining, on the contrary, if you fail to suppress the liquid demon pill, the power generated by the explosion is something that Han Yu can feel better.

Time passed slowly, and under the suppression of the fire spiritual power, the expansion of the liquid demon pill gradually decreased, but Han Yu did not dare to relax in the slightest, and still watched the changes on the surface of the demon pill closely.

Finally, when the last trace of cold marrow submerged into the liquid demon pill, Han Yu gasped heavily.

"Whew~"

"It finally didn't disappoint me......," Han Yu muttered, extinguishing the earth fire, and taking out the liquid demon pill from the pale green metallic liquid that was about to solidify.

At this time, the liquid demon pill, it may be more appropriate to call it Huogang Thunder, after there is no scorching of the earth fire, Huogang Thunder quickly cooled down, and the surface of the original fiery red demon pill has a few more snowflake-like patterns.

Looking at this Huogang Thunder that had just been successfully refined, Han Yu suppressed the excitement in his heart and carefully placed it in the brocade box.

The process of refining the Huogang Thunder this time can be said to be quite thrilling, the reason why it was able to be successfully refined was somewhat with some luck elements, or rather, it was the refining of the live broadcast system that increased the success rate and helped Han Yu refine this Huogang Thunder.

Opening the list of proficiency of intermediate refiners, as Han Yu expected, the successful refining of this Huogang Thunder, which is comparable to a high-level magic weapon, directly increased the proficiency to 10/100, which is equivalent to successfully refining ten intermediate magic weapons.

Han Yu had a faint look of joy on his face, with this Huogang Thunder, in the next assessment, he could be regarded as having a big killing weapon.