Four days later.

Laboratory, main laboratory.

Richard stood in front of the long experimental table, in the light of the candlelight, preparing to go to the underground market again.

His eyes fell on his hands, and Richard examined the ring he was wearing.

On each of the left and right hands, there are two rings.

On the left hand, the one worn on the index finger is the space iron ring, which has three functions - the absolute defense of space transfer, the absolute cutting of space scissors, and the absolute processing of space accuracy

Worn on the middle finger is a quaint ring from the elder Mullen, which can only play a role close to the fever of some books. Although it has few roles, it is the key to deciphering the secrets of the White Stone Tower and the Black Spirit King.

On the right hand, worn on the index finger is a ring number, on which are engraved the magic patterns of the four solidified spells - Wind Brute Force, Wind Lightness, Pierce's Nerve Sensitivity and Accelerated Recovery, which play a strong role.

As soon as Richard's mind moved, the free energy elements poured out from the magic source in his body, injected into the No. 1 ring to activate, and the four spells were released at the same time, blessing his body.

Richard felt that his body was first slightly heavy, and the battle armor formed by air condensation covered the surface of his body, and then his feet were light, and the wind shoes of air condensation appeared on his feet, and then the hair stood up, the perception was amplified, and the cell metabolism was strengthened and the recovery speed was accelerated.

"Whew-"

Inspector Richard exhaled, canceled the effects of the four spells, and looked at the number two ring on his right hand's middle finger.

Not long after the second ring was newly made, it was not weak to depict the magic patterns of the three solidified spells - paralyzing lightning, frost freezing, and corrosive toxins.

Richard tried to activate the second ring, and saw three inconspicuous flashes of light on it. If these three rays of light fall on the enemy, it will definitely make the enemy feel good!

The role of the No. 2 ring is completely different from the role of the No. 1 ring, and it can even be said to be opposite. Ring 1 is mainly used to amplify one's own abilities, while Ring 2 is used to weaken the enemy's status, and one increase and one decrease can establish a huge advantage in battle.

Now Richard has a rough plan for the production of the rest of the rings in the future, and has decided to share four to six magic rings to strengthen his abilities in different aspects, assist him in the battle at the wizard apprentice level, and ensure that he has the ability to confront the real wizard head-on.

After examining the ring, Richard flipped through his hand and took out a variety of potions from the spatial iron ring, such as "Trial Crafting Acuity Elixir", "Spartan Heroic Elixir", "Spartan Warrior Elixir", etc.

These potions do not have a permanent effect compared to the ring, but they can significantly enhance the abilities of a certain aspect of the body for a certain period of time, thus breaking the stalemate in battle.

In Richard's opinion, these drugs are generally not used, especially this time to go to the underground market. However, there is absolutely no mistake in being prepared.

Putting away the potion, Richard flipped his hand, and there was another bead the size of a blood-red eyeball in his hand. This is the Destruction Bead from Old Mullen, according to Old Mullen's description, the power is enough to kill the real wizard in seconds, which is one of his current hole cards. Of course, just like the potion, he didn't think that he would use it in the big market this time, at most he was prepared.

In fact, in his opinion, if there is no accident when he goes to the big market this time, he only needs to show part of his strength, and he will enter the interior of the Forbidden Book House smoothly, and ensure that his identity will not be exposed.

Before that, of course, needs to ...... Disguise it.

Richard put away the Doom Orb and began to disguise himself, allowing him to disguise himself as a person with a new appearance and a new identity.

Richard recited the incantation in his mouth, so that the trick of "water droplet condensation" came into play, and a part of the special gas in the air was separated, slowly gathered together, and after most of the sound, it turned into a transparent bubble, slowly sticking to the surface of the body.

It didn't look any different from normal, but Richard thought of it, and let the transparent bubble slowly open a slit, and some of the gas in it entered his mouth. Richard tried to speak, but his voice was very different from the original, and it seemed sharp.

This is so because the gas inhaled is helium.

Generally speaking, the human body can make sound because the air in the lungs passes through the vocal cords, causing the vocal cords to vibrate and produce sound waves. Sound waves change through the vocal tract and come out of the lips to become sounds.

Whereas, the speed at which sound travels within different media is different. Under normal circumstances, the vocal channels in the human mouth and nose are filled with 1.293kg/cubic meter of air, and the speed of sound propagation in them is 340m/s.

After inhaling the inert gas helium in the vocal tract, because the helium is 0.1786kg/cubic meter, which is much lighter than air, the speed of sound propagation will be nearly three times higher, and the sound will sound sharp.

And if you fill the channel with some other gas heavier than air, making the sound travel slower, it will sound muffled.

One of the great advantages of using this method to change your voice and disguise your identity is convenience. Because the nature of the gas and the speed of sound propagation are fixed, as long as the gas is inhaled reasonably, it can ensure that a person does not need to make any changes to change the sound into another. It is much simpler than deliberately going out of tune and deliberately disguising itself to another voice, and it will not damage the fragile vocal cords.

Of course, it should be noted that this method cannot be used consistently. In other words, you can't inhale inert gas continuously to make sounds. Because the inert gas does not contain oxygen, trying to inhale the inert gas to make a sound can cause suffocation.

The solution is also simple, that is, inhale an inert gas to say a word, then pause for a while, inhale normal air to replenish the body's metabolic oxygen consumption, and then continue to inhale the inert gas to make a sound.

When using this method, pauses can be disguised as silence or reflection, and there is little suspicion.

With this in mind, Richard used the "condensed water droplets" to constantly adjust the type of gas, and the subject's voice was different. In the end, he chose a gas he liked, making his voice hoarse, and it sounded like he was not young.

After camouflaging his voice, Richard began to disguise his face, using various cosmetics to modify the details of his face, making his eyebrows thicker, his eyes bigger, and his complexion darker......

After putting on his makeup, Richard glanced in the mirror and nodded in satisfaction, then began to put on new decorations: a thick black robe that obscured most of his face, black leather gloves with half fingers, and high-heeled boots......

Eventually, Richard looked in the mirror and saw that he had completely changed his appearance, and could not find any of the original features.

"Good. Richard said in a hoarse voice, nodded his head, and walked out of the laboratory and into the underground market.