After a small half a day of natural cooling, the giant flying sword in the mold has solidified and formed. Like a giant crystal, it sparkles. When the fire shines on it, it can reflect the figure of a person, which is very clear.

Bending down, Zhou Nan slammed his muscles, and slowly lifted the giant flying sword, which was one person tall, with a swelling muscle. The flying sword weighed four or five hundred pounds, and it was extremely heavy to start. Fortunately, he practiced martial arts since he was a child, tempered his body, and after becoming an immortal cultivator, he washed his marrow and cut his hair many times, and his strength was great. Otherwise, it's really hard to hold.

However, just relying on the strength of the flesh and physical strength, Zhou Nan was still a little unbearable to use this flying sword. The muscles on his arms bulged, Zhou Nan carried the flying sword, made a few strokes, and then pushed open the casting furnace that had already been burned and melted, and put the giant flying sword on the fire, and heated it up with the high temperature of the magma fire.

Because the flying sword is extremely resistant to high temperatures and has a huge size, it took a long time for the giant flying sword to be burned red. Without hesitation, Zhou Nan lifted the red-hot flying sword and put it on the casting table. His face turned pale, and he threw off his arms, picked up the casting hammer, and struck it vigorously on the giant flying sword.

With the sound of clanging hammers, the giant flying sword, which was originally as smooth as a mirror, was suddenly smashed into dozens of ugly pits of different sizes. After the flying sword was cold, Zhou Nan heated it up again and beat it again...

Time is like water, half a year flies by in a flash. But no matter how time passed, the sound of hammering in the cave never stopped. Zhou Nan was like a tireless machine, beating the red giant flying sword over and over again.

After half a year of hard work, Zhou Nan's size has also increased. The muscles of the whole body become stronger and stronger, and the lines become more defined. The hard work, even with his eyes, is more calm and sharp.

And the red giant flying sword, under his continuous tempering, has already changed greatly. The height has changed from one person to half a person tall. The surface, which was originally smooth as a mirror, is now covered with strange patterns. The greatsword no longer glowed as red as before, and even turned a little black.

Throwing away the casting hammer that had become half-cut, Zhou Nan lifted the red flying sword, put it in front of his eyes, squinted his eyes slightly, took a deep breath, and looked at it carefully.

After looking at it for a while, a smile lifted on the corner of Zhou Nan's mouth. Just casually waved the flying sword in his hand, and there was a sonic boom. After half a year of casting, Zhou Nan has adapted to the weight of the red flying sword.

Red flint stone is the best material for creating middle and lower grade magic weapons.

But Zhou Nan's flying sword is different. Not only does it use a lot of flint, but it is full of materials. Moreover, it has been tempered for thousands of years, and its hardness has been raised to the extent that it can be compared with high-grade flying swords.

At least, Zhou Nan wanted to use the silver flying sword to carve the formation on it, but he couldn't do it. However, the use of this flying sword is still a headache for Zhou Nan. The weight of that horror is still very heavy, very heavy.

The flying sword takes the light route. The lighter it is, the easier it is for the mind to manipulate. But Zhou Nan is good, when his head was hot, he actually added all the Xuanflint stones to this flying sword, and only then did he form such a freak flying sword.

In terms of value, the materials used for this flying sword, the light Xuanflint stone, are worth four or five thousand lower-grade spirit stones, which is several times more than the silver flying sword. I didn't think about this at the time, and it wasn't until the flying sword was cast that Zhou Nan came back to his senses. In desperation, I had to smile wryly.

"Forget it, there will always be a solution. Stroking the red flying sword, Zhou Nan said slowly.

Now, his great foundry business is coming to an end. He'd been working on it for almost a whole year to forge the sword. The three-year mission time is almost over, no matter what, it is impossible for Zhou Nan to continue to stay here, and he has to go out and explain. Even if it is for the sake of showmanship, it is necessary to complete the task of the sect.

In the following time, Zhou Nan carved a new casting furnace and refined all the obsidian, copper concentrate, black iron ore and so on.

After a year of casting, Zhou Nan has become more proficient in the technique of purifying raw ore. And there is also a new method, combining the casting of the mortal world with the things of immortal cultivators. It not only improves the casting speed, but also increases the quality of the utensils. This is the biggest harvest of Zhou Nan in the past year.

After purifying the ore, for the time being, Zhou Nan has no other ideas for casting. I had to purify the ores, put them in a storage bag, and put them away again. When you use it in the future, you can use it directly.

As for the remaining small pile of purple flint stones, Zhou Nan was helpless when he saw it, so he had to put them in the storage bag as they were. This purple Xuanflin Stone is the ore for refining spiritual weapons, and its high temperature resistance is several times that of the red Xuanfu. With his current means, he can't even melt it, and there is no way to refine it at all.

Magma Earth Fire, although the temperature is very high, is still in the category of mortal fire, and it is okay to dissolve the materials of the refining magic weapon, but the more advanced materials are out of the way. If you want to melt the purple flint, you need a higher level of flame.

For example, the spiritual fire in the foundation building period, the Dan fire in the knot period, and the infant fire in the Yuan infant stage. Spiritual fire can be used to refine spiritual weapons. Danhuo can be used to refine magic weapons. Infant fire can be used to refine spiritual treasures. These flames are very good, but unfortunately they need to be supported by advanced cultivation. Now that his cultivation is still shallow, he can only think about it, and there is no way at all for the time being.

After packing up his things, Zhou Nan collected the formation. Looking at the ground full of broken casting hammers, casting tables, casting furnaces, and those stone slabs carved with formations, he shook his head and sighed with emotion on his face.

Immediately, feeling the heat rushing into the cave, Zhou Nan restrained his thoughts. With just a wave of his hand, he didn't stop there, stepped on a flying sword, and flew out.

But at the moment when Zhou Nan just left the cave, under the magma, a pair of fiery red eyes stared at his departing figure, but in one eye, it was full of tyranny.

Standing on top of the flying sword, Zhou Nan identified the hole in the sky dozens of zhang above, and was about to turn into a blue light and leave. But suddenly, his heart tightened, and he screamed that it was not good, and then flashed to the side.

As soon as Zhou Nan left his place, a thick torrent of magma rushed over and hit the stone wall, leaving a huge pit. The hard stone was smashed into small boulders and fell into the magma, splashing a few ripples.

Suspended in the air, Zhou Nan's divine thoughts spread out, enveloping a space hundreds of zhang in size. Then, without hesitation, he took out the disc magic weapon, turned it into the size of a zhangxu, levitated it at his side, and cautiously flew towards the entrance of the cave.

However, it didn't take long for Zhou Nangang to finish all this. With a loud 'bang', the magma below tumbled violently. Soon, a whirlpool about ten feet in size emerged.

Looking at all this, Zhou Nan scolded his mother in his heart and sighed. Why did he encounter such a strange thing just after leaving the cave? However, he did not stop, seized the time, and flew towards the entrance of the cave at a high speed.

When he saw that the entrance of the cave was imminent, he was about to go out. But a strong wind behind him had already caught up, and after seeing the magma torrent, Zhou Nan didn't dare to solve it, so he had to sigh and flash to the side again.

Without paying too much attention to the explosion sound of the strong wind hitting the stone wall, Zhou Nan suspended at the highest place, staring at the huge whirlpool on the magma, his face became extremely serious.

Next, with a few temptations. Zhou Nan found that as long as he didn't move, the whirlpool didn't move either. If he wants to leave, the Vortex won't fire a magma torrent attack. For a while, he passively fell into a stalemate.

"What is this, why is it so strange, could it be that there is some demon beast hidden in this magma?" Staring at the whirlpool below, Zhou Nan frowned, puzzled in his heart.

His mind could only shroud in the air, and he couldn't detect what was going on beneath the lava, and he couldn't see what was going on. But he couldn't keep dragging on with this thing, so as soon as his eyes rolled, Zhou Nan had a plan.

Taking out the silver flying sword, Zhou Nan dodged again and shot towards the entrance of the cave. Sure enough, it was the same as the result of his temptation. As soon as he moved, the magma torrent arrived as scheduled. But suddenly, Zhou Nan sneered, quickly retreated, and fell down more than ten zhang suddenly, the silver flying sword turned into a blue light, shook out a few afterimages, and shot into the whirlpool.

The silver flying sword was very sharp, and it easily brought a terrible scream. With a successful blow, Zhou Nan did not rush forward, quickly withdrew the silver flying sword, and quickly rose more than ten zhang before stopping.

His series of movements are very skillful and short-lived. After the scream, a small mountain-sized protrusion rose from the magma whirlpool. The magma brought up slowly flowed down, and Zhou Nan looked at it attentively, only to feel a weakness in his back. After a while, it was covered with cold sweat.

The magma dispersed, revealing its true protrusion. I saw a hideous head of four or five zhang in size, a fiery red giant eye of one zhang in size, and a serpentine monster covered in thick scale armor, staring at him deadly. Within the eyes, there is a lot of tyranny written, and it is terrible just to look at.

"What kind of monster is this, this head is too big!" Zhou Nan clenched his fists and exclaimed.