Being at Hogwarts, something's not right with this system.

Friday's classes only include one potion class in the morning, and then there's nothing else to do.

Of course, Hogwarts also has homework, which needs to be handed in to the professors when classes start the following week.

We had some free time in the morning, and then had lunch.

Harry and Ron found Lin Yu and asked him, "We're going to visit Hagrid later, Lin Yu, do you want to come along?"

Lin Yu refused without hesitation, saying, "No, I just went there a few days ago. You guys go ahead."

Ron asked with a mischievous grin, "You want to play with Hermione, right?"

Lin Yu gave Ron a meaningful look, thought for a moment and then said, "Of course not. Hermione is planning to spend the afternoon at the library. I have other things to do."

Hermione does enjoy reading and learning; for her, reading is a form of leisure, and she likes it.

Lin Yu did indeed have something to do. He hadn't yet integrated and digested the vast memories he had just acquired. Besides, he now had ten thousand low-grade spirit stones, which might allow him to raise his cultivation level by one or even two realms.

And so, the group of people who had been inseparable recently split up temporarily.

Lin Yu returned to the eighth floor alone, but instead of going to the lounge, he opened the small door of the Room of Requirement again and went inside alone.

Taking advantage of the security of the Room of Requirement, Lin Yu began to absorb those memories.

Although I haven't obtained the Felix Felicis yet, it doesn't matter; I'll absorb the memories first.

Once I get the Felix Felicis, I can always come back and reflect on those insights from my memories.

In an instant, a flood of memories that did not belong to him began to surge into Lin Yu's mind.

Countless pieces of information about medicinal herbs that he had never seen before and did not recognize flooded his mind. Some were plant-based, some were flowers and grasses, and some were animal-based, such as the gallbladder of a snake, the inner core of a monster, and even the skin, bones, blood and flesh of animals.

What the system implanted in him was practically a complete pharmacology encyclopedia of a fantasy world.

That's not just a setting from Battle Through the Heavens; it even includes medicines from many other worlds.

It's as if the system already knows that this is a magical world, so even if it gives all this information to Lin Yu, it doesn't really mean much to him.

Or perhaps this could be considered a form of additional compensation?

Is this reward only possible because this isn't some fantasy world?

Or is this the system's own selfish motive?

Besides information about medicinal herbs, what's even more difficult and complex is the experience in alchemy, especially the experience of a master alchemist.

This is something that Lin Yu is not yet able to fully comprehend or understand at this stage, so a large portion of the obscure and difficult-to-understand memories remain locked away, with only a small portion of the memories being integrated by him.

Even this small part was enough for Lin Yu to successfully reach the Mahayana stage.

This shows how valuable the insights of a master alchemist are.

Perhaps it is a summary of the insights of countless alchemists.

This also gave Lin Yu a preliminary understanding of the pile of medicinal herbs in his system space.

Don't forget that he still has many medicinal herbs that he hasn't had a chance to use. He used them as materials when he was refining the Marrow Cleansing Pill.

After absorbing the memories about alchemy, Lin Yu rested for a while.

He felt dizzy and lightheaded, but fortunately, he wasn't an ordinary child. He had memories of his previous life as an adult, so he was still quite determined.

Otherwise, such a sudden surge of memories would be absolutely unbearable.

Lin Yu couldn't help but press his forehead with his hand and said with a wry smile, "This is really unexpected, it almost turned into a bad thing. Fortunately, I am now a cultivator, and although I don't have a technique to cultivate divine sense, the divine sense that comes with the second level of Qi Refining is enough."

It turns out that when Lin Yu reached the first level of the Qi Refining stage, he already had the ability to control his divine sense. However, he could not release it outside his body for the time being. He could only look inward at his own condition, such as looking inward at his dantian and meridians.

Lin Yu couldn't help but wonder if his initial decision was correct, or if he should have chosen the Divine Sense Technique.

But when he thought about the potential power of the Nine Forms of Cloud Abyss, Lin Yu shook his head.

He was originally a wizard, and as his cultivation level increased, his divine sense would also grow further.

What he lacks is a strong means of self-protection.

Moreover, as one's cultivation level increases, the power of the Nine Forms of Cloud Abyss will also increase.

Sooner or later, even without magic, no one will dare to look down on him anymore.

Lin Yu believed that day would not be far off.

Lin Yu then continued to receive the relevant memories of the array master.

In an instant, a flood of memories about formations and insights from formation masters came rushing back.

Lin Yu felt dizzy again, but luckily he had sat down on the ground beforehand; otherwise, he probably would have fallen.

A moment later, Lin Yu shook his aching head vigorously.

He had a strange feeling right now. At the same time, he had a splitting headache, but also a sense of excitement, as if he hadn't slept for days and had drunk several cans of Red Bull and a few cups of coffee.

Even though his mind was a jumbled mess of thoughts and memories, new and exciting ideas kept popping up.

In particular, he was extremely interested in the memory of the complete guide to formations, especially the several formations within it.

First is the Spirit Gathering Array, a formation made of spirit stones. It can not only stimulate the spiritual energy within the spirit stones, but also strengthen the spiritual energy within the array, and gather all the spiritual energy of the surrounding heaven and earth.

It is said that many man-made blessed lands were formed by spirit-gathering arrays.

The effects vary depending on the formation's level and the spirit stones used to set it up.

Besides the Spirit Gathering Array, there are also several defensive and offensive arrays. Lin Yu felt that if he could set up the arrays in advance, he would be invincible and wouldn't be afraid even if Voldemort came.

Unfortunately, controlling the formation also requires the support of cultivation level, and his current cultivation level is still too low.

"However, this spirit-gathering array is of vital importance to me," Lin Yu muttered to himself, enduring his headache. "Although this is a magical world with magic power rather than spiritual energy, the array can amplify the spiritual energy within the spirit stones."

At this point, Lin Yu had already grasped the basic principles of the formation.

For example, the Spirit Gathering Array has its own world within it, and once the array is successfully set up, it will produce special effects.

Just like spiritual energy circulating in the body's meridians, the formation will cause the spiritual energy within the spirit stone to intertwine and operate, and through some means, make the original spiritual energy more abundant and purer.

It seems to have broken the law of conservation of energy, but this is, after all, a formation from a fantasy world. It originated from a fantasy world, so what's wrong with it being a little fantastical?

Now that Lin Yu has become a qualified wizard, he naturally doesn't consider whether something is scientific or not.

"With my current cultivation level and the number of spirit stones I have, I can only set up a first-grade spirit gathering array," Lin Yu secretly calculated.

Both formations and elixirs are graded, with grade one being the lowest and grade nine being the highest.

However, these are all just ordinary items. Above the ninth grade, there are even higher levels, such as the fourth grade of Heaven, Earth, Black and Yellow, but Heaven, Earth, Black and Yellow is only divided into upper, middle and lower grades.

In addition to these, there are also top-grade, immortal-grade, and divine-grade.

Even legendary sacred items, or even innate treasures.

And all of this, at least for now, has nothing to do with Lin Yu.