This old man has white beard and hair, is as skinny as firewood, has extraordinary aura, and looks like a master from this world.
And his aura was as powerful as the sea, enough to frighten everyone present, including the deacon who was invigilating the exam.
There is no doubt that he is a third-level martial artist!
Seeing this old man, Liu Long immediately showed respect: "Master, you... why are you here?"
After hearing Liu Long's words, everyone's eyes widened in surprise.
It turns out that this old man with white beard and hair is Liu Long's master Lu Yi.
"Elder, are you here?" Seeing Lu Yi, even the invigilator and deacon greeted him respectfully.
However, Lu Yi turned a deaf ear to the greetings of the two men. He snatched the detonator from the deacon's hand, and his face was full of shock.
"How's it going, old guy, am I right?" Lin Yun asked Lu Yi calmly, with his calm tone and expression as if he had expected this scene.
In fact, Lin Yun had long discovered that Lu Yi was staying nearby. It was precisely for this reason that Lin Yun deliberately revealed the problem with these two talismans in order to lure Lu Yi to appear.
Everyone was completely shocked when they heard what Lin Yun called Lu Yi.
Lu Yi is an outer elder of the Yuzhou Wu Mansion!
Lin Yun actually calls him "old guy". Is he tired of living?
For a moment, everyone looked at Lin Yun as if they were watching a show, obviously looking forward to how Lu Yi would punish Lin Yun next.
However, what everyone never expected was that Lu Yi didn't mind Lin Yun's disrespect towards him. He didn't even have the slightest anger on his face. He just stared blankly at the talisman in his hand and muttered to himself.
"I really didn't expect, I really didn't expect that this talisman had a deviation of one thousandth of a millimeter, and I didn't notice it. I was too careless!"
While speaking, Lu Yi looked up at Lin Yun, his eyes full of admiration: "You can detect a deviation of one thousandth of a millimeter in an instant. How do you do this?"
As soon as these words came out, the whole audience was shocked!
Everyone, including the deacon, felt as if they were struck by lightning and looked at Lin Yun with a petrified expression.
The entire scene fell into silence at this moment, as if time had been frozen.
They all thought that Lin Yun was just making things up when he said that the two talismans were wrong. However, they never expected that he was actually right.
A young man who came from nowhere could instantly find a subtle deviation that even a master like Lu Yi had missed. This is simply incredible!
"How to do it? Is this kind of thing difficult?" Lin Yun replied calmly, as if he was talking about a small thing that is easy to do.
Lu Yi almost spit out a mouthful of old blood.
It is difficult for even him, an old man who has studied talismans for many years, to detect such microscopic deviations, and omissions often occur.
But in Lin Yun's mouth, this was said to be as easy as eating.
Everyone was also choked by Lin Yun's words and couldn't speak for a long time.
After a while, Lu Yi took a deep breath and asked Lin Yun excitedly: "Little brother, you just said that the drawing materials should not use explosive animal skins, so what kind of skin should be used?"
In fact, as Lin Yun said, all detonating symbols on the market will self-destruct.
There have been countless accidents caused by this, causing many accidental casualties.
Even Lu Yi himself was accidentally injured several times. If the detonating talisman was not powerful enough, he would have died long ago.
Although self-explosion occurs frequently, people have never been able to find the real cause and can only regard it as an uncontrollable natural phenomenon.
It wasn't until today when passing by this place that Lu Yi heard Lin Yun's words by chance that he changed his perspective and thought deeply about this issue.
Lin Yun said expressionlessly: "Among the third-level drawing materials, only crack-tooth animal skin is suitable for detonating talismans."
"When it comes to the power of the detonating talisman, the cracked tooth hide is not as good as the explosive hide. However, the properties of the cracked tooth hide are very stable and will not self-destruct due to external factors."
"Cleft-tooth animal skin? I have tried this before. But the power was too low and the cost was too high, so I gave up later and few people use it on the market." Lu Yi recalled.
Lin Yun looked at Lu Yi with disdain, as if he was looking at an apprentice with extremely poor talent: "I said earlier, that is the reason for your birth."
"Your drawing techniques are not mature enough, and the drawing tools are not correct, so the finished product is not powerful enough. You can only rely on unstable materials such as Explosive Beast Skin to increase its power."
Everyone couldn't help but take a breath of cold air.
When Lu Yi was not present, Lin Yun pointed out Lu Yi's shortcomings, which was enough to make everyone secretly stunned.
But at this moment, Lin Yun actually said in front of Lu Yi that Lu Yi's drawing techniques were not mature enough, which blinded everyone's eyes!
Is this kid really not afraid of offending this master?
"Boy, you have repeatedly belittled my master! I will teach you a lesson right now!" Liu Long finally couldn't bear it anymore and threatened to teach Lin Yun a lesson.
However.
Before he could take action, Lu Yi slapped him and flew him away.
"Get out of my way and don't interfere with my teacher's business!"
After Lu Yi slapped Liu Long away, he turned around and asked Lin Yun as if nothing had happened: "Little brother, since you said that the black gold pen should not be used as a drawing tool, what should be used?"
"Just use an ordinary volcanic rock pen." Lin Yun replied calmly.
Lu Yi frowned slightly and asked in confusion: "The volcanic rock pen? Isn't this a lower-level drawing tool than the black gold pen?"
In most people's minds, the more advanced drawing tools you use, the better the effect of drawing talismans.
Therefore, no matter what kind of talismans they draw, they habitually use black gold pens, but they never consider whether it is suitable or not.
After thinking about it carefully, Lu Yi said to Lin Yun: "And the structure of the volcanic rock pen is more unstable than the black gold pen, so it should be easier to leave material residues, right?"
Lin Yun still explained expressionlessly: "Whether it is a black gold pen or a volcanic rock pen. No matter what kind of pen, there will be a trace amount of residue left during the drawing process."
"Indeed, as you said, volcanic rock pens are more likely to leave material residues than black gold pens."
"But unlike the black gold pen, the material residue of the volcanic rock pen will not reduce the power of the detonation talisman, but can also play a certain enhancement role."
"This is because there is an ingredient called gunpowder in the volcanic rock pen, and it is this ingredient that increases the power of the detonator."
After listening to Lin Yun's words, Lu Yi slapped his forehead: "Why didn't I think of this problem before? My life has been in vain!"
Lu Yi also knew that gunpowder was extremely flammable and could explode in a confined space.
The volcanic rock pen contains a high concentration of gunpowder. This fact has been ignored by him.
It wasn't until Lin Yun mentioned it at this time that he suddenly realized how stupid he had been before!