Since Sun Xiaofei got a few pieces of black gold iron from the black bull that day, he has been actively bent on refining these pieces of black gold iron and then refining them into his own flying sword magic weapon. Who knew that he had just started refining, only to find that his current cultivation had only reached the late stage of foundation building, and the real dantian fire in his body had not yet been formed, and he could not refine the refining material of black iron stone at all, unless he advanced to the next level to condense the golden pill and possess the danhuo. Sun Xiaofei knew that it would take a long time for him to advance to the next level.

If you can't advance to the next level, won't there be any other way to refine it? Sun Xiaofei pondered for a long time, and he remembered what he had seen in the classics before: Although it was said that there was a fire of cultivation in the body of a cultivator, there were still some naturally formed fires in heaven and earth. This kind of flame is full of violent energy, and the power is also very powerful, if it can be subdued and used, it can also be a great help for cultivation.

Sun Xiaofei suddenly had an idea, and thought that in a mountain range dozens of kilometers away from Glasty, there was an active volcano, which the locals called Estro Volcano. Every few years, Mount Ettori erupts, spewing out a large amount of goblin fire from the bottom of the volcano, and the goblin fire and magma cool down to form a kind of igneous crystal, which is rich in fire attribute energy. Locals often go there to collect these fire crystals, which are added to the casting process to make it easier to forge weapons.

If you can collect a large amount of fire crystal, you may not be able to use it to refine Ugin Iron. Now that the Eptroit volcano is latent, it is safer to search for fire crystals at this time. As soon as Sun Xiaofei thought of this, his heart was hot, and he couldn't sit still anymore. After hastily preparing some necessary items, we set off on our way to Mount Etour.

"Master Ryan, where are you going?" a gentle voice came from the hallway behind him.

When Sun Xiaofei heard this shout, he paused, slowly turned around, and a middle-aged woman with a slightly bloated figure and a blue and white dress appeared in front of him. Seeing this woman, Sun Xiaofei shouted, "Aunt Ruth!" and then casually made an excuse, ready to fool the past.

"Young master, you still don't want to go. Ruth listened, obviously a little worried about his safety, she was the maid who served Sun Xiaofei's mother Fanta, emotionally the two were like sisters, and Sun Xiaofei's brothers were brought up by her. Therefore, Sun Xiaofei still respects her very much. However, respect is respect, and some things must be done, so Sun Xiaofei had to think about it, hide the truth, and make up some words to deal with her at will.

"It's okay, I'll be careful, Aunt Ruth, you don't have to worry about me. I'm leaving, bye-bye. Sun Xiaofei was afraid that she would entangle her more, so he hurriedly slipped away, so as not to delay the time to collect fire crystals. From Glasdy City to and from Mount Estori, Sun Xiaofei, who did not have a flying sword, also took half a day. Therefore, Sun Xiaofei did not dare to delay.

"Young Master, be careful! Remember to come back early. Ruth shouted in the back, and Sun Xiaofei's figure was nowhere to be seen. "What a naughty and active little guy, quite like the old man when he was a child. Ruth whispered, as if she remembered something from the past, and couldn't help but smile on her face.

Sun Xiaofei was afraid that his family would be worried, so after leaving the city gate, he looked for a place where no one was around, and used his skills to quickly run towards Mount Estroba. With his current foundation cultivation to use his body to advance, he was much faster than the great Dou Master Magician of this continent, turning into a faint black shadow all the way and flashing forward, even if some people met him, they couldn't see his whereabouts clearly, and they couldn't even detect the traces he passed.

The body technique that Sun Xiaofei is using now is one of the Rainbow Sword Tricks, and the body technique that specializes in matching the Sword Technique is called Feng Xingbu. Originally, with Sun Xiaofei's cultivation during the foundation building period, as long as there was a psychic magic weapon, he could achieve the flying of the sword. However, he didn't have a single magic weapon now, and he hadn't found a single weapon in this world that could be used for him to fly with his sword. If you reluctantly use an ordinary weapon as a flying sword, the weapon will not be able to withstand the infusion of spiritual power, and the result will only be burst and damaged.

Half an hour later, Sun Xiaofei, who was speeding all the way, came to the foot of Mount Estrob. Sun Xiaofei stood at the foot of the mountain, observed the mountain carefully, and saw some figures on the mountain mixed with sparse low trees, a scorching smell full of sulfur came to the wind, the ground of the whole mountain was dry, and there were many burnt yellow, black, brown rocks everywhere, these are the scenes formed under the hot magma of the volcanic eruption.

Sun Xiaofei could spot that there were some people collecting fire crystals near the Estroba volcano, he hesitated for a moment, and then climbed up the mountain vigorously, and stopped in a huge crater in less than a moment with his swift speed. The crater is hundreds of square meters in diameter, and is surrounded by brown magma solids, and pungent ash mists that obscure most of the terrain.

Sun Xiaofei inspected the crater environment, chose a small gap to climb down, and fell to the bottom of the crater, which was already dry. The scorching smell came to my nose, and the smell of sulfur filled my nose everywhere, making me feel dizzy. Beneath the crater there are already some people mining fire crystal, which is a very strange substance, containing a huge amount of fire elemental energy, buried in a thick mound of rocky soil.

This requires digging through the layers of earth and rock formed by the solidification of magma to find the igneous crystals buried in the depths. Sun Xiaofei first cast a simple illusion to cover his figure, and then looked for a suitable place to mine fire crystal. The thick volcanic ash mist covered his figure well, and through Sun Xiaofei's divine sense, he quickly detected the location of the fire crystals stored around him, and the next thing was much simpler.

Sun Xiaofei took out the square shovel he had brought over, aimed at the place where there was a fire crystal, and began to excavate. Fire crystals of different sizes were excavated by Sun Xiaofei and put into a cloth bag. After about a few cups of tea, a bag has already been filled, Sun Xiaofei carried it by hand, it is estimated that it is about more than 100 catties, this weight is very easy for Sun Xiaofei now, and it should be almost enough. Sun Xiaofei nodded with satisfaction, then quickly tied the mouth of the bag and walked towards the top of the crater.

Sun Xiaofei carried a bag of fire crystal, flashed out to the top of the crater, and after coming out, he carefully avoided those who collected fire crystals on the mountain, and quickly ran down the slope, there are many trails on the mountain peak that can go down the mountain, however, Sun Xiaofei didn't want to attract attention, so he walked to the sparsely populated place in the back mountain. There is a waterhole on the back hill, and there are many smaller currents that flow down the mountain from here, and when the volcano erupts, the water here dries up. But now there are still a few years before the eruption, and the waterhole is still a little waterlogged, Sun Xiaofei quickly flew down the mountain and headed towards Gransdy City after cleaning it happily.

When Sun Xiaofei returned home, it was already the first night of the lanterns, so he casually found an excuse to deal with his family's inquiries, ate indiscriminately, and returned to his room. After entering the room, Sun Xiaofei couldn't wait to take out the fire crystal that was secretly placed in the room, Sun Xiaofei stared quietly for a while, calming down some fluctuations, refining the Wujin stone, you need to adjust the current state before you can start refining.

Sun Xiaofei exhaled slowly, his face became magical, and he pulled the smallest piece of black gold stone suspended in front of him, and with a move with his other hand, under the action of the true yuan force, a piece of fire crystal the size of an egg flew out of the bag, approaching the black gold stone. Where the true yuan power in the dantian gathered, a faint cultivation fire erupted, and as soon as the light blue flame touched the fire crystal, "poof!", the fire crystal immediately burned violently.

Although Sun Xiaofei couldn't use the fire of cultivation to refine the black gold stone, it was still possible to use it to ignite the fire crystal. The color of the fire crystal burned turned into a purple-red flame, the temperature in the room was obviously gradually rising, and with the barbecue of the flame, the surface of the black stone gradually underwent some changes, and some impurities broke out under the flame, revealing the dark substance inside.

Sun Xiaofei paid attention to the changes in the Wujin Stone and controlled the temperature of the flame, this kind of thing was easy for him to do. After continuing to burn for a few minutes, a piece of fire crystal turned into ashes after releasing the fire energy, Sun Xiaofei's face remained unchanged, and he quickly replaced it with another fire crystal to continue refining the black gold iron. I don't know how many pieces of fire crystal were used, and finally a piece of black gold stone was refined. This piece of black gold stone is the smallest piece, but it took Sun Xiaofei more than two hours, and now this refined black gold stone has shrunk to a small half of the original.

Sun Xiaofei sighed, it seems that it is really not easy to refine the black gold stone, the refining speed is too slow according to this method, and he has to find a way to solve this problem. Sun Xiaofei took a look at the refined black gold stone, which was small in size, a little rough in shape, and shiny in black on the surface, mixed with a little golden luster.

Sun Xiaofei had an idea and thought of a solution to the current problem. Sun Xiaofei cast a spell to levitate all the fire crystals in front of him, sending out a flame to refine these fire crystals. Suddenly, the temperature soared, and a pile of ashes piled up on the ground in a short time under his control. Sun Xiaofei opened his mouth and absorbed these flames into Danyou, the blazing temperature made his face flushed, his body was drenched in sweat, and the flames in the dantian were raging everywhere, but they were wrapped in True Yuan Force, unable to cause any harm to his body.

Sun Xiaofei worked hard to operate the true yuan power in his body, surrounded the flames that entered the body, and then devoured the fire energy into the true yuan power, Sun Xiaofei absorbed all the fire energy and fused it into the true yuan power in his body, making the fire of cultivation more refined.

Sun Xiaofei rested for a while, and then refined the Wujin Stone after recovering to his normal state. This time, it was quite smooth, and it took less time than the first time to refine, and the refining speed was much faster. Sun Xiaofei breathed a sigh of relief, and finally received a little effect. Hurry up and buy time to refine the black gold stone before dawn. It's a pity that Sun Xiaofei tossed all night, and finally refined four small pieces of black gold iron.

In the early morning of the next day, Sun Xiaofei suddenly woke up, and as soon as his divine sense looked at his body, the innate true yuan was more condensed and improved, and there were faint signs of a breakthrough. The volume of the cyclone in the dantian became larger, and as long as enough true yuan power was accumulated, it was only a matter of time before it condensed into a dan. This is also the reason why when he was born, he had a complete consciousness and was able to absorb the innate true essence brought by his birth, which made his cultivation speed extremely fast. After all, this situation like his is rare in the world, and almost no one can know how to absorb the cultivation path at the time of birth, and in vain these innate true elements are lost.

In the time that followed, Sun Xiaofei took time out again and quietly went to the Estrob volcano a few times, retrieved enough fire crystals, and finally refined all the other pieces of black gold stones. Now, just wait for him to get the first knot of Jindan, and then refine his first flying sword magic weapon.