This kind of common-sense question is naturally no secret to Marcus.

It was only after Marcus's answer that Roger first learned of the existence of this invisible barrier, which, according to Marcus, was not only encountered when a beginner wizard apprentice was promoted to a mid-level wizard apprentice. When Roger reaches the mid-level wizard apprentice and wants to advance again, he will also encounter obstacles.

In fact, this barrier is the biggest obstacle to every advancement on the wizard's path.

When facing this barrier, people with high wizard talent will take advantage, because the more talented people are, the easier their cross-level barrier will be, and vice versa, the more difficult the cross-level barrier will be.

Nowhere is this distinction between difficulty and ease more evident than in elemental wizards.

The way elemental wizards cross ranks is called ...... by other wizards. Feel the method of leapfrogging.

As we all know, when a wizard encounters a barrier, the previous way of slowly accumulating spiritual power to make it grow is no longer applicable, and in front of the barrier, no matter how you accumulate it, you will be stuck in the extreme spiritual power of the current rank. The way elemental wizards increase their spiritual power is usually to practice spells that are in line with their own rank to stimulate their spiritual power in reverse, so that it can continue to accumulate and grow.

For example, Roger is a beginner wizard apprentice, and he can continuously increase his total mental power by practicing different level 1 spells to stimulate his mental power.

However, when his mental power broke through to 5 units, due to the barrier, no matter how many level 1 spells he practiced, it would never be possible to accumulate spiritual power to 6 units.

To get past the barrier, the way to get past the elemental wizard is both simple and complicated.

Because elemental wizards only need to continuously improve the level of elemental perception of the line they are cultivating, they can naturally dissolve the cross-level barrier.

Roger had learned about it when he first came into contact with elemental spells, and the level of elemental perception was divided into five levels, and each ladder could be subdivided into two levels, Xiaocheng and Dacheng, and different levels of elemental perception also determined what level of spells a wizard could use.

Taking Roger himself as an example, his knowledge of the two elemental systems of earth and fire is currently at the first level of elemental comprehension - the Xiaocheng level of initial enlightenment, with his level of elemental comprehension, as long as the rune array outline is proficient enough, he can release any level 1 spell of these two elemental systems without hindrance.

If it is a level 2 spell, even if the mental power is enough to outline the rune array of a certain level 2 spell, whether it can really be released and mastered by that kind of spell still needs to be determined by constant trying.

But there's a big paradox here......

If you want to improve your elemental perception, you must cultivate spells that are close to the limit of your spiritual power in order to improve the level of elemental perception, in other words, you must practice spells beyond your own level in order to improve your level of perception of a certain elemental system.

Beginner wizard apprentices are generally at the small level of the first level of elemental perception, and can only master level 1 spells under normal circumstances, but when they want to improve their elemental perception level to dissolve the cross-level barrier, they must practice level 2 spells with a very low success rate.

The difficulty is self-evident.

It is worth mentioning that compared to the popular elemental system, those rarer elemental systems suffer much more when facing the cross-step barrier. Because, there are many elemental spells, and it is extremely difficult to even practice spells that are in line with one's own rank, and it is even more difficult to practice the spells of the next rank across levels.

Like Augustine's thunder spell, if you want to practice it across levels, the difficulty is many times more than that of ordinary fire and water, and it is even more exaggerated that Roger has no chance to practice the space system at present.

On the other hand, multi-elemental wizards are no better than rare elemental ones when facing cross-step barriers. For some reason, if a multi-elemental wizard wants to dissolve the cross-step barrier, he must improve the level of perception of all the elemental systems he is cultivating at the same time.

Raising the level of perception of a certain element alone cannot dissolve the cross-step barrier.

Therefore, under normal circumstances, a two-element wizard like Roger would not be much easier than a rare elemental when it comes to crossing levels.

However, this level of difficulty is much simpler than that of a person who has too little talent and has exhausted his potential. For those who are judged to have exhausted their potential, when their own wizard level reaches a certain limit, their cross-level barrier will be several times or even more than ten times more difficult than that of people of the same level, in other words, if they want to dissolve the cross-level barrier, they also need to increase their elemental perception level to several times or ten times that of a wizard of the same level.

This would have been almost impossible without adventure. This is also the reason why some people with low talent have obviously improved their spiritual power very quickly, but they have not been able to advance for a long time.

Moreover, the barrier that Roger encountered now was only the barrier when he crossed the small rank, and compared to the barrier of advancing from a wizard apprentice to a full-fledged wizard, the difficulty of the two was not at the same level at all.

Roger himself is a bloodline wizard, and at the same time cultivates the dual elements of earth and fire.

Bloodline wizards also have their own unique way of crossing levels, but Roger finally chose to use the elemental system to advance to a mid-level wizard apprentice, for the simple reason - it has the mirror world, and when it comes to practicing and mastering new spells, it is too cheap.

Even if it is many times more difficult to master a level 2 spell than it is to master a level 1 spell, the failure rate is countless times higher in the process of cultivation......

But don't forget, failure rates have never been an issue for Roger.

When he entered the mirror world with his thoughts, not only did he have five times the time equivalent to the outside world, but he also didn't have to worry about running out of mental power when practicing spells, and he also didn't need to worry about the danger that might arise when he failed to practice new spells.

In this case, it only took him about a month to raise the perception level of the two elemental systems he had mastered to the Dacheng level of the first level, and he also successfully dissolved the first cross-level barrier he encountered, and became a middle-level wizard apprentice.

"If there is no mirror world, with my second-class wizard talent, it should be no problem if I want to advance to a mid-level wizard apprentice...... But after all, I am a dual-element wizard, even if there is no problem in terms of talent, but if I want to improve the perception level of both elements at the same time, the time it will take must be extremely long, and it will never be as fast as now. Remembering that it only took him a month to successfully dissolve the barrier, Roger couldn't help but be glad that he had the world in the mirror.

Unlike Ram, Roger was over a hundred years old before he became a wizard's apprentice, and if he didn't succeed in embarking on the wizarding path, he probably wouldn't have a few years to live.

Now that he has become an apprentice wizard, the lifespan limit has certainly been raised to two hundred years, but the years that Roger has lived before cannot be changed. The rest of his lifespan was still equal to two hundred years minus the years he had spent before, which was much shorter than the time left for him to break through to a full-fledged wizard compared to many wizarding apprentices, so he wouldn't waste a single day of his life.