Everyone's eyes focused on Haoren, and Haoren nodded slightly: "There is no need to worry about the energy crystal. Since I have said it, it can naturally be provided."

After that, Wang Han distributed the list of materials to others one by one. Everyone glanced at them from beginning to end, and they all secretly breathed a sigh of relief. One of the tailor girls patted their chests and smiled and said, "They are all very simple things. I thought magic technology needed so much advanced materials!"

The items on the material list are very common, such as high-temperature resistant canvas, which are essential for making tents. Almost every tailor can sew. As for those steel pipes and metals, the forgeators can also easily solve them.

Wang Han smiled and said, "Although magic technology is good, it is not a very advanced product. At least it is much easier to understand than electromagnetics."

"A rope that is resistant to high pressure and has a certain amount of tolerance. Do we have this thing?" a girl asked timidly.

Wang Han was slightly stunned and replied: "The hot air balloon I designed can carry 100 people at a time, otherwise it would be impossible to transport all people away within a week, so the requirements for connecting ropes are relatively high."

Several tailors looked at each other and looked embarrassed.

"I'll do it!" Haoren said slowly: "I think I can provide the rope that can carry the weight of a hundred people!"

In the curious eyes of everyone, Haoren stroked the ink-colored spider silk ring and fired a white spider silk as thick as a thumb. Then he handed the spider silk to Wang Han and asked: "This kind of spider silk can withstand a weight of 100 kilograms and is tied together with dozens of them. The bearing capacity should be enough."

Wang Han pulled the spider silk hard, showing surprise: "What a great elasticity! It only takes forty such spider silk to tie together and use it together!"

After solving this problem, others had no doubts.

The major stood up and finally made a decision: "Very good! Then everyone should go back and divide the work and cooperate immediately. Remember, you must move quickly! We don't have much time left!"

The others left the office one after another with excitement. Haoren stayed at the last one, and waited for everyone else to leave. Then he quietly stared at the major and asked in a low voice: "Tell me, how long can the fortress last?"

Youxie couldn't say it just now. But in front of Haoren, the major didn't seem to intend to hide it. There was solemnity between his eyebrows: "Five to seven days! This is already the limit. The damage to the city wall is much more serious than imagined. The spider monster's attack in the past two days has been strengthened!"

As he spoke, the harsh alarm ringtone rang again, and Haoren's expression changed slightly. It was less than an hour since the last attack!

"I'll go and help!"

Haoren rushed out of the house, opened the wings of the Fire God and rushed into the blue sky. The weather is very good today, but the dark spider wave seems to be more dark than before, making people feel uncomfortable.

"Vacuum slash!"

Haoren squandered more than 20 flame sword energy in one breath, each sword energy could cause about six or seven hundred flame damage. For those ordinary people with only a few hundred combat power, it was enough to kill them in seconds.

After one round of attack, Haoren immediately returned to the city wall, put away the wings of the Fire God, and waited for the reply of the sword energy value. At the same time, he was treated by the priests. Although there were afterimage techniques to avoid the attack, there were too many spiders under his feet, and he would always suffer at least several hundred points of damage every time he went out.

This was repeated several times, and with the help of the advantage of high altitude, the little spiders who attacked the fortress suffered great casualties. Although it was nothing to the entire spider sea, it somewhat alleviated the defensive pressure of archers and mages on the fortress.

With the addition of gasoline and diesel, the mage's firewall technique turned the entire city wall into a sea of ​​fire. The flames frantically swallowed and licked every spider that dared to rush in, but the effect of fire damage on fire spiders was very limited. Ice mages used hail technique to continuously shoot on fire spiders.

The archers' arrow rain range is even longer. Their targets are small spiders who only have a few hundred combat power but account for at least half of the number. These guys are not big, with extremely low health and defense, but they are like they are rushing towards the black iron metal layer outside the fortress like they are playing hard, and they are constantly consuming the defense durability of the fortress with their lives!

The battle became even more intense. Every minute and every second, people fell in a pool of blood and were lifted down from the head of the city. Someone quickly replaced them. The battle lasted for an entire hour, and the spider monster's offensive gradually subsided.

Everyone did not dare to be careless at all. They stared at the city with weapons until the spider monster retreated a hundred meters away, then they collapsed on the ground, gasping for breath, their temples and forehead were already covered with sweat, and their faces were full of fatigue.

On the ground in the castle, hundreds of corpses were placed side by side, some with broken limbs and arms, while others had their entire bodies penetrated through huge holes, and their deaths were extremely miserable.

"Please carry it down and cremate!" The major waved his hand weakly.

The initial dead people were buried on the spot, but with the surge in the number of deaths, they had to adopt the Ruihua method. After all, corpses cannot be discarded anywhere, otherwise they will become nutrients for the evolution of mutant monsters.

The battles over the past few days have gradually grown into elites. They have already been quite high in both their own level and skill level. With their proficient cooperation tactics, it is almost no problem to kill ordinary spider monsters in seconds.

But there are too many spider monsters. Whether it is firewall technique or arrow rain, you can clear a large area of ​​spider monsters every time you attack, but in less than a second, more spiders will surge up.

This number advantage makes people desperate. God knows when such a huge spider tide appeared in Jinling City, and the number is still increasing day by day.

After seeing the cruelty of this stranglehold, Haoren came to Wang Han’s location and ordered: “The magic hot air balloon must be created as soon as possible!”

"I understand without you saying it!"

News about creating hot air balloons to escape quickly spread throughout the fortress. Anyone who could not defend the city came to help. Although they did not have a suitable secondary profession, most of them could not help much.

After the battle, Jiang Junqing rushed over to be a helper. His deputy profession was also a forge, and some metal tools needed for hot air balloons needed to be created.

"This is the drawing of the thermal magic weapon!" Wang Han opened the notebook, drew a crooked picture on it, and handed it to Haoren. While wiping the sweat beads on his forehead, he said: "This is the most critical part. I need some of the lava crystals for experiments so that the final success can be guaranteed."

Wang Han’s paintings were really not good-looking. Haoren could not recognize them for a long time, so he returned the notebook to him and nodded and said, “Yes, I will provide you with how many lava crystals you want, but what’s going on with your experiment?”

During the experiment, Wang Hanping retreated everyone else. According to what he said, there may be certain dangers in the experiment of this thing?

"You didn't seem to have said you wanted to experiment before, let alone there was danger!" Haoren rubbed his head with a headache. Before leaving, the others looked at them with suspicious eyes.

Everyone treated the magic weapon of the second civilization with a curious but unbelievable attitude.

Wang Han laughed dryly: "Don't worry, it's just a routine experiment. It will be completed soon, and there will be no danger."

"Then why do you let everyone else avoid it!" Haoren muttered a few words in disappointment. The so-called danger is actually a slight explosion that may occur. Haoren's flame resistance is very high and he is immune to fire damage, so he chose to stay and watch the entire experiment.

In front of him was a painted black rectangular metal iron box, which was forged by black iron metal with very few reserves. A high-end lava crystal was placed in the metal iron box, and an iron pipe as thick as an arm was inserted at the tail of the iron box, which was also made of black iron.

Wang Han pressed the button outside the iron box a few times, and the fire attribute energy inside the lava crystal began to fluctuate violently. Circles of light red ripples visible to the naked eye rippled near the crystal. The entire metal box was slightly chaired and continued to intensify.

"Are you really sure it's just a slight explosion?" Haoren frowned. Since he merged with the Heart of Fire, his perception of the energy of the fire element in the air seemed to be more sensitive. He clearly felt that the fire energy around him became extremely active.

"Don't worry, I'm an intermediate magician and I'm very familiar with this thing. In fact, the principle of this magic device is very simple. The fire energy in the lava crystal is extracted through the magic theory to serve as the power of the hot air balloon." Wang Han seemed confident and suddenly shouted: "Look, the lava crystal has reacted!"

A dazzling light flashed on the surface of the lava crystal, as if it were sunny, and the activity level of fire elements around it reached its peak.

"Run!" Haoren quickly activated the Wings of the Fire God, pulled Wang Han and flew into the air. A few seconds later, accompanied by the dull explosion, thick black smoke rose from the ground.

"Error! Mistake!" Wang Han rubbed the black smoke on his face and quickly explained: "Because the conversion ratio requires continuous debugging, failure is inevitable. Give me time and I will definitely succeed!"

Haoren sighed: "Whatever you want, you can do it as soon as possible. Forget it, I'll just stay here, otherwise I'm really worried that you will be blown away by yourself."

His concerns are reasonable. According to what Wang Han said, adjusting the magic conversion amplitude, in more than an hour, similar explosions sounded twenty or thirty times, and the most powerful one even left a large deep pit on the ground.

No matter what, after wasting a whole piece of advanced lava crystal, Wang Han finally determined the final conversion amplitude ratio. After activating the magic weapon again, there was no explosion. Haoren felt that although the fire energy in the air was active, it was very gentle.

The fire energy was extracted from the inside of the lava crystal and released through the metal conduit. A strong hot wind blew towards him. Haoren, who was dozens of meters away, could feel the powerful impact of the hot wind.

Wang Han happily raised his hands and smiled: "It's successful! The magic test was successful!" (To be continued.,,,
Chapter completed!