Duke did not inform Vivian about the earrings, as the matter involves plane coordinates, and he had to exercise caution.

He was somewhat distrustful of the magic of the Wizard's Mark, always feeling that some very important information couldn't be communicated through it.

The Wizard's Mark itself is a simple minor spell, and its ability to achieve long-distance communication relies on something else.

Duke was not unfamiliar with this, having experienced things like communication towers in his previous life and possessing some understanding of the principles of communication.

In his view, the Wizard's Mark likely adopted a similar structure, thereby achieving communication anywhere within the Wizard Plane.

This means that the information transmitted by the Wizard's Mark probably passes through some communication tower-like places, and such information is likely to be intercepted by certain people.

Everyday messages naturally wouldn't draw attention, but if plane coordinates were mentioned, then it would be a different matter.

Considering this point, Duke was being so cautious.

He was still too weak, unable to be noticed by certain individuals, lacking any real ability to protect himself as of now.

"Nightmare Plane..."

Duke deeply felt that his knowledge regarding planes was too limited, so he enrolled in a course titled "The Wizard Plane and the Endless Plane," taught by Selene.

Back then, he also learned the Deep Blue Tide Meditation Technique in Selene's class, and among the official wizards, Selene was known for having a comparatively good temper, being easygoing and more patient.

Duke spent ten pieces of Level 1 Magic Stone to enroll in this course, which was not a big deal to him since he had nearly two hundred pieces of Level 1 Magic Stone in his pocket, mostly contributed by Uli.

Regarding Uli, Duke recently heard about some things concerning the Jokic Clan and Master Land.

Merrick was still too impetuous; under the premise of being wanted, he boldly left Black Sail and went to Dusk City to indulge in revelry.

Such behavior was blatantly provocative toward the Jokic Clan, equating to slapping them in the face, showing no respect whatsoever.

As a city under the jurisdiction of the Silver Hand, Dusk City was strictly managed, so naturally, no one dared to assassinate Merrick there.

However, once Merrick left Dusk City, he encountered assassination attempts, and not just from one hitman.

He wasn't a fool, as someone was secretly guarding him, and the guardian resolved both assassins.

After this incident, Master Land seized the opportunity to publicly denounce the Jokic Clan in various publications for sending hitmen to commit murder.

This was followed by a war of words...

Duke merely kept an eye on the development of the situation, preferring it to spiral into chaos. The worse it got for both sides, the better his chances of survival in the turmoil.

For him, the later their negotiations, the better, as it would wash away traces of the island more thoroughly, making it harder to find any connection to himself.

It was said that the Jokic Clan had tried locating Uli's body, but discovered that the sensed body had dispersed into hundreds or thousands of parts throughout the sea, making it impossible to find.

Clearly, this indicated that the body had been consumed by sea creatures and had undergone multiple cycles in the ecosystem by now.

Even if they found it, it would just be a pile of excrement.

...

Two days later.

Duke arrived at a lecture hall, found a seat near the front, and waited for the course to begin.

There weren't many people in this expansive lecture hall, scattered about were only forty or fifty individuals.

Duke observed, noticing that these were all quite powerful, with many being first-class wizard apprentices, and only a few were second-class apprentices.

As for third-class wizard apprentices, not a single one was present.

He, as a second-class wizard apprentice, felt somewhat conspicuous sitting there.

After some thought, Duke understood; the knowledge about planes was still far too advanced for wizard apprentices and impractical in the short term.

The enrollment fee for this course was also not cheap for ordinary wizard apprentices, costing ten pieces of Level 1 Magic Stone.

Ordinary wizard apprentices already live tight on resources for cultivation, so they wouldn't have spare money for such courses.

After a while, Selene appeared, still sporting a Mediterranean-style sparse hair, with only a few locks hanging.

Duke couldn't help but wonder, could even official wizards not solve hair loss issues?

He thought it seemed unlikely, probably just that Selene didn't care about such matters.

During this time, Duke noticed that many wizards were like this; they seemed somewhat unkempt and didn't care about their outward appearance in daily life.

To them, spending time and energy on their appearance was less appealing than dedicating more to their research.

The classroom gradually filled with people, yet ultimately only about sixty attendees, most of them being first-class wizard apprentices.

Duke figured why mostly first-class apprentices attended; typically, exploring other planes required at least the strength of a first-level official wizard.

These first-class wizard apprentices were preparing ahead, gaining some relevant knowledge.

Seeing everyone settled, Selene began the course content in earnest.

This course had no accompanying textbooks; the material relied entirely on what was in Selene's mind.

However, after the course, he would recommend some books for the wizard apprentices to purchase and read at their discretion.

"Firstly, what is a plane," Selene began his lecture.

He pointed to the ceiling and said, "Every night, when you look up, you can see a sky full of stars. These stars are generally divided into two categories: planets and planes..."

He drew a circle on the blackboard, with a shell-like structure surrounding it, and then started his explanation.

Duke listened attentively, realizing that this was essentially a lesson on cosmic knowledge, aligning with a lot of what he knew from his previous life.

This world was similar to his previous life, possessing a boundless universe filled with countless planets.

The difference was that planes existed in this universe.

Planets were like those in the previous life, rather fragile, typically only having a protective atmosphere.

These were the most common in the vast universe.

Planes were different; they had an external plane barrier, a structure composed of rules, exceedingly sturdy.

Generally, ordinary forces could hardly inflict even the slightest damage on a plane barrier.

Plane barriers provided a secure protection for the beings within, allowing them to proliferate, nurture, and grow peacefully.

Any world referred to as a plane had the presence of a plane barrier, though the differences between plane barriers in different planes were significant.

This brought up another concept related to planes: the classification of plane levels.

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