Gu Qingfeng turned and left the Eye Demon's cell.
However, he didn't immediately proceed to the next cell. Instead, he first began to study the Pupil Technique: Illusion Vision.
He had only used it hastily earlier, without understanding the specific details.
So he carefully examined the information about Illusion Vision in his mind.
After about 15 minutes, a glimmer of excitement flashed in Gu Qingfeng's eyes.
This Pupil Technique: Illusion Vision was truly a powerful skill!
It actually possessed two functions: control and creating illusions.
Control meant that the caster could manipulate the target's personal actions. Just like how Gu Qingfeng had made the Eye Demon kneel down earlier - the demon's body had obeyed without any resistance.
Creating illusions meant that the caster could, according to their own will, make the target fall into any illusory realm. The nature of the illusion depended entirely on how the caster constructed it.
However, the drawback of Illusion Vision was that it required direct eye contact to activate.
Moreover, the target's soul power couldn't be higher than the caster's, otherwise the effect would be greatly reduced or even fail completely.
In other words, the strength of Illusion Vision depended on how much greater the caster's soul power was compared to the target's. The larger the gap, the stronger the effect of Illusion Vision.
Although it had obvious flaws, Gu Qingfeng was still quite satisfied.
After all, this was a skill with growth potential. It was different from Bronze Skin Iron Bones, which didn't have any growth potential. The defense power of Bronze Skin Iron Bones was fixed and wouldn't increase as one's overall strength improved.
But Illusion Vision was a skill that would enhance along with the user's increasing soul power!
Gu Qingfeng made a rough estimate. With his current soul power, using Illusion Vision against martial artists in the Qi Gathering Realm shouldn't be a problem. But against those in the Internal Qi Realm, the outcome was uncertain.
After all, Gu Qingfeng was currently only at the third level of the Qi Gathering Realm. He was still far from advancing to the Internal Qi Realm, so naturally, he couldn't gauge how powerful martial artists in the Internal Qi Realm were.
As far as Gu Qingfeng knew, the martial arts world was divided into five major realms: Qi Gathering Realm, Internal Qi Realm, True Qi Realm, Tough Qi Realm, and Innate Realm (Master).
These five major realms corresponded to the five ranks of Demon Eliminators in the Demon Suppression Bureau: Apprentice Demon Eliminator, Yellow-rank Demon Eliminator, Dark-rank Demon Eliminator, Earth-rank Demon Eliminator, and Heaven-rank Demon Eliminator.
Each major martial realm was further divided into nine minor levels.
That is, from the first to the ninth level, with nine being the peak. Only after reaching the ninth level of the current realm could one break through and advance to the next realm.
And Gu Qingfeng, now at the third level of the Qi Gathering Realm, was still far from the Internal Qi Realm, with four, five, six, seven, eight, and nine levels to go.
The Qi Gathering Realm, as the name suggests, involves gathering the elemental energy of heaven and earth into one's body. If we compare the human body to a sponge, then the elemental energy would be like the moisture in the air. The sponge absorbs moisture and gradually becomes wet. When the sponge is completely saturated, it means the physical body is full of elemental energy, signifying the peak of the Qi Gathering Realm.
Although Gu Qingfeng's realm was low, in terms of combat power, he dared say that even a martial artist at the ninth level of the Qi Gathering Realm would be no match for him.
First of all, with Bronze Skin Iron Bones plus the mastered Iron Cloth Shirt, it wasn't something that could be broken by someone in the Qi Gathering Realm. At this stage, there were no supernatural abilities, only the continuous accumulation of elemental energy, passively strengthening the body and increasing strength, endurance, and so on.
But no matter how strong or robust the body became, it was still within the realm of mortals. Could a punch shatter steel?
Obviously not.
Therefore, with just this point alone, Gu Qingfeng was already in an invincible position.
Secondly, there was the trump card of Illusion Vision, which needed no further explanation.
Of course, these were all secondary. The most important factor was the system!
In just two short days, it had elevated Gu Qingfeng from a weakling at the third level of the Qi Gathering Realm to being invincible among his peers. What about a few more days?
What if Gu Qingfeng cleared the entire third floor of the Demon Suppression Prison?
At that time, even facing a Heaven-rank Demon Eliminator, the outcome might be unpredictable.
The future was indeed promising!
With aspirations for the future, Gu Qingfeng walked towards the next cell.
He stopped in front of it, about to politely knock on the door.
However, before he could knock, an elderly voice suddenly came from within the cell.
"Young man, come here."
"Oh? So proactive?"
Gu Qingfeng grinned, then opened the small window. This time he was mentally prepared, in case something suddenly appeared at the window to startle him.
However, nothing frightening appeared.
Looking inside, Gu Qingfeng saw an elderly man with white hair and a kind face imprisoned in the cell.
Seeing Gu Qingfeng, the old man smiled benevolently.
"Young man, are you here to collect materials for talismans too?"
Materials for talismans!?
Gu Qingfeng was slightly taken aback, not understanding what this meant.
The old man continued slowly, "It seems that your Demon Suppression Bureau has been under pressure in recent battles. I remember the last time someone came to collect materials was half a month ago. I didn't expect you to use them up so quickly."
After speaking, the old man reached into his loose robe, seeming to pull at something with effort. A flash of pain crossed his kind face.
"Here you are, young man."
The old man took out a blackish object from his robe, about to toss it through the small window.
At this point, Gu Qingfeng was still confused. What was going on? Offering a gift right upon meeting?
However, being skilled and daring, he immediately reached his hand through the small window to receive the gift.
Seeing his rash action, the old man was stunned.
???
Is this person new? A greenhorn?
The old man, having lived for over a hundred years, prided himself on his vast experience, but he had never seen such a reckless Demon Eliminator.
Reaching a hand into a cell holding demons and monsters?
This feeling was akin to reaching into a tiger's cage at the zoo to feed it, instead of simply throwing the food in. It was as if one feared the tiger wouldn't get enough to eat!