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Is there really such a thing as a free lunch in this world?
To be honest, Rimuru could hardly believe it.
Ancient One's status was far too high. If she truly wanted to deceive him, there was no way he could resist anyway.
But he had to admit—the temptation of being allowed into the library was simply too great.
Strictly speaking, Rimuru was a born magician.
Especially with Great Sage's ability, [Chant Annulment], he could cast magic without any incantation at all.
In other words, as long as Rimuru learned a spell, mastering it would never be a problem.
For example, it took Mordo a long ritual to create a single magical whip, but in Rimuru's hands, with only a thought, dozens or even hundreds of them could appear instantly at terrifying speed.
Scary, right?
Right now, Rimuru was like someone born incredibly wealthy. As long as he learned a few "investment strategies," his strength would grow exponentially.
Opportunities like this didn't come often. Miss this chance, and there might never be another.
"Great Sage, can you analyze the books in the library?"
[Confirmed!]
Rimuru immediately decided to go all in.
Even if the Ancient One had set a trap for him, so what?
His power was growing every moment, and the world itself was entering an era of rapid change. If he failed to move forward, he would eventually be left behind and reduced to ashes.
"Thank you for your generosity, Supreme Sorcerer."
Rimuru bowed respectfully.
"If Earth ever faces a crisis in the future, I will definitely do everything in my power to help."
The Ancient One had spent her entire life protecting Earth. She had carried too many burdens and sacrificed too much. Earth's safety had long become her deepest obsession.
So Rimuru's words struck directly at her heart.
Hearing him say that, the Ancient One smiled happily.
Talking to smart people really was relaxing.
"At Kamar-Taj, all knowledge is shared," she said calmly. "However, some knowledge is forbidden to practice. Your talent is extraordinary, but your foundations are weak. When reading, don't focus only on powerful spells."
Was the Ancient One actually giving him guidance?
Rimuru immediately straightened his posture. His large eyes sparkled as he listened with utmost seriousness, practically begging her to continue.
The Ancient One smiled.
Though her body still appeared youthful, her mind had already grown old after living for so many years.
Seeing a lively and adorable child like Rimuru made her feel unexpectedly refreshed.
It had to be said—appearance mattered in this world. If some ugly fellow tried acting cute like this, she probably would have smacked him with her fan.
"If you wish to study," she continued, "I suggest starting with books like The Book of Cagliostro, A New Theory of the Universe, and Perspectives on the Multiverse. These books will teach you to see the world from an entirely new perspective. That is extremely important for the practice of magic."
"After that, you can build your foundation with books such as Introduction to Magic, Meditation, and The Mind and Magic. Then you may move on to more advanced works like The Key of Solomon, The Supreme Codex, Newton's Cryptography, and The Book of Galileo."
The Ancient One spoke very seriously, while Rimuru listened attentively.
But when he heard titles like Newton's Cryptography and The Book of Galileo, he still couldn't help complaining inwardly.
No wonder Newton could never rest peacefully in his grave.
As the Supreme Sorcerer explained everything, a study plan gradually formed in Rimuru's mind.
Several minutes later, the Ancient One finally stopped.
The books she had mentioned were already enough to keep Rimuru occupied for a very long time.
Rimuru thanked her once again, then immediately took advantage of the opportunity. Walking closer to her with an innocent smile, he said sweetly:
"Master, could you use Mirror Magic once more? Slowly this time. Earlier, Master Mordo moved too quickly, and I didn't even have time to eat properly."
The Ancient One nearly spilled her tea.
Since when did she have a disciple?
And what did "not enough time to eat" even mean?!
"Master~ please? Just one more time?"
Compared to learning Mirror Magic within seconds, Rimuru's shamelessness was even more astonishing.
"You can… eat it?"
The Ancient One looked genuinely confused.
Had the world changed too quickly?
Someone was actually tugging at her sleeve and asking her to make "dessert"?
What kind of nonsense was this?
"Master~ Master~ Master~"
A vein twitched on the Ancient One's forehead.
Especially when one of the female disciples happened to walk in, only to freeze in shock before desperately holding back laughter and running away.
At that moment, the Ancient One could no longer maintain her dignified expression.
With a wave of her hand—
Crack!
Space shattered like glass, splitting apart into countless mirror-like fractures.
"Yes!"
Rimuru instantly activated Predator, turning into blue slime and rushing directly into the dimensional crack.
In an instant, the entire Mirror Dimension was devoured.
The feeling of eating at full power was absolutely wonderful!
Rimuru casually waved his hand.
The entire room immediately flipped upside down. The ground and walls twisted, rotated, and transformed freely as though they had come alive.
Although the Ancient One had already witnessed similar things before, she was still deeply shocked by the sight.
What exactly was this devouring ability?
It was unbelievable.
The magical whips and shields from earlier were merely different applications of magical energy. Their essence was fundamentally the same.
But Mirror Magic was an extremely advanced and dangerous spell.
It demanded incredibly high levels of magical power, spiritual strength, and spatial understanding. In Kamar-Taj, fewer than a hundred people were even qualified to learn it, and those who truly mastered it were even rarer.
Yet Rimuru had completely mastered it after devouring it only once.
Even the Ancient One felt a trace of envy.
"Thank you, Master, for your generous gift!"
Rimuru was overflowing with gratitude.
Honestly, this spell would make things so much more convenient in the future.
The perfect magic for murder and robbery!
If he ever wanted to trick someone, he could simply drag them into the Mirror Dimension. Heh… even if they screamed, nobody would hear them.
Seeing the sweet smile on Rimuru's face, the Ancient One nodded with satisfaction.
It even reminded her of her own youth, when she had once trained tirelessly in magic. Back then, even the slightest improvement would make her happy for days.
Unfortunately, after becoming the Sorcerer Supreme, that kind of joy had gradually disappeared.
Perhaps that was simply the price of growing older.
Just then, Rimuru's voice interrupted her nostalgia.
His sparkling eyes were filled with excitement and curiosity, almost like Chitanda Eru whenever something caught her interest.
"Master, do you have any other secret magic techniques? Your disciple is willing to help you develop them!"
The Ancient One: "…"
Although her mastery over her emotions was extraordinary, Rimuru still managed to make her lose composure from time to time.
Maybe letting this greedy child into the library had been a mistake.
Rimuru might be clueless in many areas, but his instincts for reading people and emotions were terrifyingly sharp.
After bowing respectfully three times, he immediately ran off.
Watching his reckless retreating figure, the Ancient One couldn't help but laugh softly.
Her disciples had always treated her with utmost reverence. Rimuru's sudden appearance felt refreshing—and unexpectedly entertaining.
The Ancient One slowly picked up her tea once more.
Drinking tea beneath the evening sunset truly suited her best.
But just then—
A small head peeked in through the doorway.
"Master Ancient One… can I eat two books from the library?"
PUFF!
The Ancient One sprayed out a mouthful of tea and coughed violently.
She was furious.
Every sorcerer at Kamar-Taj studied tirelessly day and night, working desperately to improve themselves.
And this brat wanted to devour books and instantly master all her magic?!
Where in the world could such a cheap shortcut exist?!
The Ancient One shouted angrily:
"If you dare eat my books, I'll banish you into the wilderness!"
Rimuru jumped in fright.
Even an honest person became terrifying when angry!
The wind roared loudly through the hall.