It didn't take ten minutes. When seven minutes later, with Freya's shout, Catherine dispersed the struggling Phantom Legion. If the controlled sea tribes could retain their consciousness, they must have felt very surprised at this time, because a silver metal fortress appeared in front of them.

This is a hemispherical fortress with a radius of about seven meters. The fortress is like a soup bowl buckle on the ground. But when you look closely, it is actually not a smooth spherical surface, but composed of countless regular hexagonal metal blocks. Around the fortress, there are a total of twenty shooting holes on the metal wall. The shooting holes face in all directions, including directly above the fortress. Each shooting hole is equipped with a crystal energy gun. The muzzle and the shooting hole are tightly slit and slightly sunken into the fortress wall. It is difficult to directly attack the barrel. At one-third of the top of the fortress, there is a grid-shaped grid surrounding the entire fortress. Through this small and dense mesh, people inside can observe the situation outside, but the outside cannot directly attack it.

About five centimeters outside the metal fortress, a magic barrier flashed with faint purple light. There were crackling energy flows on the barrier from time to time, but it only wandered on the arc of the barrier and would never interfere with the metal fortress below the barrier. The magic barrier is also hemispherical, with the bottom overlapping with the bottom of the fortress, and other parts are slightly wider than the surface of the fortress. Apart from the energy flow wandering on the arc of the barrier, there is no magic fluctuation emitted by the barrier at all, making it difficult to guess the role of the barrier.

In the eyes of the controlled sea tribes, this defensive position seems to appear out of thin air, but in fact it is the strongest defensive position set up by the three girls.

As early as Catherine unfolded the circular defensive formation, Lina quickly searched the range. After confirming that there was no mission target, she first cast the magic technique to open up a solid and flat ground. After the ground was leveled, Vivian glanced at her eyes and shouted in a low voice: "The radius is seven meters, the circular range."

"Understand." Freya raised her thumb and threw the big backpack behind her back to the ground. Freya's giant backpack was the same as Vivian's style. However, it was larger than Vivian's backpack. This was a gift from Vivian after she returned to the adventure group. It was also eight times the space. The weight reduction array was also nested, but even so, when the backpack fell to the ground, it still made a heavy impact sound. Throwing the backpack down. Freya even felt that she had become much lighter and couldn't help but move her shoulders and adapt.

"Well, the only benefit of getting fat." Lina swung her casually, and a stone skin technique was put on Catherine, which strengthened her defense for a short time, covered her mouth and said with a 'silence' smile: "In the past, I'm afraid you can't carry such a heavy thing at all."

"Shut up." Freya rolled her eyes and cursed: "Don't be idle either. There are a few parts of me in your backpack. Take it out for me quickly."

"Those metal blocks that can crush people?" Lina said as she opened her backpack, "It's too heavy, I'll put it at home."

"Don't talk nonsense." Freya said angrily: "If you talk nonsense, don't cry when your elder sister beat you up later."

"I'll give it to you." Although Lina kept joking, her hands were not slow at all. She took out five or six irregular metal polyhedrons of different sizes and threw them on the ground under Freya's instructions. Freya was also doing the same thing, constantly taking out polyhedrons of various specifications from her backpack. In a blink of an eye, the metal blocks of large and small were spread all over the floor. All the metal blocks had a silver-white appearance, flashing with cold metal streamers.

"Are these goblin metals?" Vivian, who is also a scholar, was the most sensitive. He could see the amazing part of Freya's removal of these metals at a glance, and his eyes were almost bulging out: "You can actually use goblin metal?"

"You really don't know how to learn mechanics. I didn't expect that you are known as the most amazing genius in a thousand years, but you still have this side." Freya arranged the metal blocks on the ground with dazzling speed, while still teasing: "These are just assembled from the teacher's material library. As long as you have a good understanding of machinery, this assembly is not difficult. The difficulty lies in the collection and matching of parts. Sometimes even a millimeter is not enough. Are you done?"

"I'm waiting for you." Vivian held a mitril silver metal plate with a diameter of one meter in his hand, and controlled more than ten magic knives with magic silk threads from the puppet control technique around him. A rough circular area has been circled on the ground: "I can adjust according to your three-dimensional range. Don't worry, I'm sure faster than you, you're ready and start first."

"Then I'll start." Freya nodded, and her fingers began to jump in the air again like playing a piano. The metal blocks of different sizes on the ground began to change as the jump of her fingers began to change, and each piece of metal block was spreading layer by layer like a closed bud in full bloom. Under Freya's control, metal blocks kept floating into the air, flying back and forth around the circular space with a radius of seven meters. The flight trajectories were intertwined, but no collision occurred in the air.

Soon, some metal blocks spread out into thick metal plates, spliced ​​together with each other, surrounding the bottom of the circular area, forming a base against the ground. Below the metal plate, threaded metal drills penetrated deeply into the flat ground, firmly fixing the base on the surface. The base was completed, and Freya's fingers bounced faster and more frequently. The metal blocks in the sky kept changing their position and shape, which made people dazzled. There were constant clicking sounds, which were the locking sounds made when the metal parts were linked to each other. The base on the surface began to slowly extend upwards, and the metal walls began to gradually increase. Looking at these silver walls, you could even notice the rise of the walls.

"It is to build a hemispherical shape according to this arc?" Vivian looked for a while before asking, "There are no other special changes."

Freya just shook her head. Now was the most critical moment for her control and she had no time to distract herself.

"Okay, then it's my turn below." Vivian nodded, placed the metal plate in his hand in the center of the circular area, stood up, and whispered a long spell. A blurry purple circular phantom appeared at Vivian's feet, and the phantom continued to stretch outward until it expanded to a radius of seven meters. The spell seals of Vivian's hands changed again, and purple lines interlaced with each other began to appear inside the circular phantom. The number of lines became more and more. Looking closely, the length and position of all lines were completely enlarged on the mitral plate under Vivian's feet. There was no difference in the two except proportions. There was more and more lines, and the circular magic array became clearer and clearer. When the magic array formed by the purple light was infinitely close to the reality, Vivian suddenly raised his foot and stepped heavily. The illusory purple magic array suddenly printed on the flat ground, changing from illusory light to real patterns.

Vivian took back the Misilian plate, sat cross-legged in the center of the magic circle, opened a small leather bag and placed it in front of him, took out a piece of Sankiter crystal from it, grabbed it in his left hand, and slapped his right hand on the ground, shouting in a low voice: "Vivian mode, simulation, elemental barrier."

The magic circle that turned into real patterns shone again with Vivian's slap. The purple hemispherical shield suddenly appeared, covering the space around the girls. At the same time, Freya's project was approaching the end, and the open space above her head became smaller and smaller. When the last few clicks sounded, the last piece of metal was spliced ​​in place, blocking the remaining open space, allowing the girls to be in a completely enclosed space, and only the part of the grid-shaped grid was connected to the outside world.

Freya's face, which had been tense since work, reappeared her usual gentle and elegant smile. She waved her fingers that had already stopped again. After a few sounds, twenty shooting holes appeared on the fortress. The twenty crystal energy guns that had been prepared had automatically floated up and were inserted into the shooting holes under Freya's remote control.

"It's done." Freya clapped the soil that did not exist in her hand and said with a smile: "Absolutely strong defensive fortress."

"But, that, I have another question." Lina blinked, playing with the silver hair on her shoulder, and asked uncertainly: "Have you forgotten something?"

"Forgot?" Freya looked around and confirmed that there were no missing parts, and asked strangely: "Nothing was missing."

"Don't you think there are few people here?" Lina asked, "Are you planning to get your elder sister into the ground?"

"Ha, don't worry, this is my fortress. Everything inside and outside the fortress is under my control." Freya smiled and patted her hands gently. The metal splicing sounded again. A wall of the fortress suddenly contracted to the inside of the walls on both sides, opening a one-person entrance and exit. Freya shouted with the flow: "Sister, we've finished it. You're too much consumption. Come in and have a rest. Don't worry, we'll be very safe here and there is nothing to be afraid of."

Catherine, who was already panting and sweating outside, looked back and jumped into the entrance of the fortress, which then canceled the Legion skill. Freya clapped her hands again, and the walls around the entrance extended again, completely blocking the entrance.

It was not until the entrance was closed that Catherine let out a heavy breath and looked around with the sweat on her forehead. The inside of the fortress was also a smooth metal wall, and no complicated parts were seen. Obviously, the parts had been filled between the inner and outer layers. The inner metal wall was also silver-white, and it looked like it was also made of goblin metal, giving people a very reliable feeling.

"Welcome." Freya saluted to Catherine's elegant and ladylike kneeling, like a attentive master: "Welcome to Freya's mobile fortress."
Chapter completed!