The reason why Rebecca said "can't be used" is simple.

Ordinary people do not have the ability to charge the magic array, nor can they control the opening and stop of the magic array.

The magic circles of the masters are completely different from the simple symbols engraved on stones by ordinary people. The latter is like picking up a wooden stick from the roadside as a crutch, while the former uses various technical means to build a wheelchair. The gap is equivalent to original materials and industrial products. The symbols engraved on stones will continue to produce effectiveness without the participation of outsiders. Although they are weak, they do not require any skills. However, the magic circle... it is a complex thing to operate.

To run on two legs, you only need to raise your legs and walk, but if you want to reach a speed of 70 miles per hour, you have to buy a car and add fuel and take the driver's license. The same is true for magic circles. They require energy infusion and professionals with magic control skills are responsible for opening and closing - even the simpler magic circles.

Heti and Rebecca could run to the blacksmith shop without carving simple combustion arrays on each stove without carving them, but they could not stay here all day and charge the arrays every other furnace of ore, and were also responsible for controlling the energy flow of all arrays.

"If you want to carve the magic array on the stove, its size is destined to be limited. Even with Aunt Hetty's ability, you can only carve the auxiliary magic array of the second level or below," Rebecca explained seriously, and tried to make his expression appear more professional. "And it is impossible for such a small-scale magic array to be self-charged - a magic array that can absorb free magic power by itself must be as big as a tent, so someone must charge the magic array on the furnace. In addition, even the simplest magic array only needs to be switched, and ordinary people cannot control it..."

Through Gowan Cecil's memory, Gowan knew that the magic circles in this world had very complex classification and operating principles, and if they did not consider those professional knowledge that made people feel overwhelmed, they could also be roughly classified:

From the scale classification, it can be divided into small, medium, large and super large. The smallest magic array can be engraved on armored swords and swords. Currently, the two largest magic arrays in the world are located in the Thousand Towers City of Violet Kingdom in the north and the "Star Temple" built by the elves in the southern part of the continent. The two magic arrays are based on cities and outlined by urban roads, and can be described as terrifying scale.

From the classification of functional complexity, it can be divided into two categories: single functional type and compound type.

From the classification of charging methods, it can be divided into self-charge and external injection. Among them, the self-charge magic array has a complex "draw" structure, which can absorb the free magic power from the outside world by itself. However, because except for the magic focus, the free magic power in nature is very thin, and the absorption structure of the self-charge magic array will be quite huge. Therefore, all self-charge magic arrays cover a huge area, while all small magic arrays can only use external injection to replenish energy.

Moreover, in this world, self-charged magic arrays are actually something that is rarely used - because they are too inefficient.

A self-charged structure often occupies 80% of the entire magic array, but the energy it can provide is not as high as the component of a tributary of any magic focal point. However, several rune arrays with complex functions can be stuffed into the large drawing area. Therefore, from the perspective of efficiency, mages would rather choose to charge the magic array yourself than choose a slow and huge self-charge structure.

This is why all the large magic facilities in this world are located near the focal point of magic: it is because of the convenience of charging.

Gao Wen touched his chin and looked at the blacksmith furnace in front of him.

He then asked two questions:

"Do you have to draw the charging part on the stove?"

"Do you have to stuff all the functions into one magic circle?"

Rebecca was stunned and blinked in confusion: "What if?"

Gao Wen vaguely felt that he had grasped the key to the problem: people in this world seemed to only focus on turning magic into the most primitive and crude power, or simply pay attention to the individual's use of power, and never considered how to promote this "extraordinary power" in a broader and lower-basic way.

"Draw a large self-charge magic array, let it absorb the free magic power in the air, and then leave the 'output terminal' on this large magic array to output the magic power to the small magic array on the furnace. In this way, the charging problem will be solved, and the switching problem... can make the connection between the furnace and the self-charge magic array controllable. After the cut, the small magic array will naturally stop. The large self-charge magic array itself has the nature of over-enriching and dispersing, so there is no need to worry about being burst..."

Rebecca quickly understood Gao Wen's philosophy in his own way: "Disassembly the magic circles piece by piece? Can it still be like this?"

"This is somewhat of an idea," Gao Wen nodded, "I think I can discuss it with Herty-she should be more professional."

Rebecca deeply agreed with this - although Aunt Hetty's spellcasting accurate head can only reach the level of human strokes, in terms of theoretical knowledge, those intermediate mages may not be able to compare with her!

So Gao Wen led the people away from the place again, leaving the old blacksmith Hammer and a group of apprentices behind, and the handyman looked at each other.

"Master, are we still turning on the furnace next?" An apprentice asked carefully. When the Duke and Viscount were standing in front of him, he didn't dare to breathe. Only then did he finally dare to speak.

The old blacksmith glared at the apprentice: "Nonsense! Of course, turn on the furnace! Don't think about being lazy - whether you can eat meat at night depends on the results of this furnace!"

On the other side, Gowen had sent Amber to call Hetty to his tent, but after he finished speaking his thoughts, the elegant lady shook her head.

"The idea of ​​using one magic array to charge another magic array is very good, but it is too difficult to operate... The output of magic power is very accurate. Once there is a problem with the 'interface', both magic arrays will be scrapped. Moreover, the efficiency of the self-charged magic array is also a big problem. Even if a magic array as big as a compound in the blacksmith shop is drawn, the magic power it generates may not drive several magic furnaces..."

Gao Wen looked at Hetty. Of course he knew that the other party would raise these difficulties, but he actually had a solution.

So he smiled slightly. As he thought about this issue deepened, he felt that he had finally found the route he should take. So he pushed the large pile of drawings on the table aside and spread an extra large drawing full of symbols and lines on the table.

The thing on this piece of paper was drawn by him a few days ago, but until today he realized what it could be useful.

"Look at this," Gao Wen said.

Hedy looked at the large rune array on the table in surprise. Her first reaction was that his ancestor was so knowledgeable: "Ancestor... do you actually know how to draw magic arrays?!"

"I only know a little bit, and this magic circle was not created by me," Gao Wen deliberately kept it a secret. "You have any ideas when you look at it first?"

Hetty lowered his head, carefully studied the connection rules between each symbol and the symbols on it, and his brows slowly frowned: "They are all the most basic runes... The arrangement and combination methods are also the most basic, as if the highest energy level does not exceed the second level?"

Gao Wen nodded: "Because the person who left this magic array can only control the rune array with a level 2 energy intensity at most."

Hedy looked up at him in surprise, and when she looked down, she couldn't help but feel a little admiration on her face: "It's really all the designs that were completed with basic runes... using the most basic runes to create such a large-scale magic array. This... is really an incredible creation... This seems to be a structure that can draw free energy from the natural environment? But what are these extra complex structures..."

Gao Wen pointed to the repeated structures in the ring area of ​​the magic circle: "Zoom in."

"Enlarge?" Hetty widened his eyes, and then suddenly realized, "Yes! This can be enlarged... and the structure here can further purify the free energy... In this way, these basic runes can absorb free energy with higher efficiency. This is really... it is..."

Hetty "really" for a long time, but he didn't expect the right words to describe the feeling this magic circle brought to her, but Gao Wen knew what she wanted to say: "It's really hard work, right? It's like a lame man walking all over the world with a crutch, just like an unarmed man carved a poem on a stone with a wooden stick. This is an effort that goes beyond the limit, and uses the most basic second-level runes to draw a miracle that can make those great magicians dumbfounded."

"Those great magicians are probably not dumbfounded, they won't even look at it in front of it," Hetty smiled bitterly and shook his head, "because although this magic array is very creative, it is pieced together with second-level runes. No matter how efficient it is, the energy it absorbs cannot be comparable to the personal magic well owned by the great magicians..."

"But it is a prototype, a basic model that can be continuously improved. It only has second-order runes. But what if you change the second-order runes to third-order based on this idea? What if you also increase their combination complexity to third-order? How many times the efficiency is that of the existing self-charged magic array?" Gao Wen said, pointing to several special nodes in the magic array. "In addition to efficiency, you can take a look at these more critical parts."

"This... seems to be a magic channel?" Hetty frowned. "I saw them just now, but I didn't see the corresponding energy-consuming unit. Is it because the magic array is not complete?"

"No, from the beginning, this magic array did not contain energy-consuming units. Its only function was to supply magic to the outside world - to provide magic to a weak human. Because of this, it is different from the internal interface of ordinary magic arrays. The 'compatible' of these channels is so high that as long as it is an energy-consuming unit, it can be connected to it," Gao Wen said slowly, "Now, can this magic array provide energy to the blacksmith shop?"

"If all the symbols can be played smoothly... no, they will definitely work smoothly. It has almost reached the limit of calculation!" The expression on Herty's face gradually became excited. She finally jumped out of the traditional wizard's thinking and realized the greatness of this thing. "High-efficiency self-charging, and can also output energy to the outside with a very wide 'frequency'. It can completely provide energy to the blacksmith shop, and even... to... to power more things!"

Then she couldn't wait to ask, "Ancestor, what's the name of this genius magic array?"

Gao Wen took out a worn note from his body: "I don't need to name it - its creator has given it a name."

Open the notes and write a short line of notes on one of the pages:

"Anne, I finally completed the 'magic net' today, and I hope it can bless you with health."
Chapter completed!