Su Jinxi was somewhat prepared. The moment she opened the "Grand Medicine Compendium," she felt an intense repulsion. She immediately channeled her entire body's true energy, preventing herself from getting seriously injured.

Just slightly revealing the cover unleashed such a terrifying force. If she were to truly open the book, wouldn't even she be unable to withstand it?

Su Jinxi was filled with doubt and hesitation. She didn't dare to rashly attempt to turn the next page. As a great demon at the tenth level of the Tribulation Crossing stage, she barely withstood a single page. She definitely couldn't bear the pressure of the entire book. But Su Jinxi was certain of one thing.

This sacred book was real!

Su Jinxi looked at the "Grand Medicine Compendium," her cat tail trembling with excitement.

It's said that this book was written by a "Medicine Immortal" from the Great Void Era of this world. The pages are fragments left from the dawn of creation, and even the text contains the ultimate truths of heaven and earth and the rules of the great Dao. The book itself is already of a semi-"Immortal Grade." True Immortal Grade artifacts can transform into human form and possess high intelligence, unlike this book which remains in its original form.

However, it's said that the Grand Medicine Compendium actually possesses intelligence, it just cannot transform into a human.

Most importantly, it's about the content recorded in the "Grand Medicine Compendium"!

In the path of alchemy, whether it's the alchemist or the quality of the pills, they are divided into nine ranks. The further you go, the greater the difference. A Ninth Grade Alchemist is already the limit of the current era.

But in the ancient Great Void times, these so-called one to nine ranks were all classified as "Mortal Rank"!

Above the "Mortal Rank," there are rumors of King Grade, Emperor Grade, and Imperial Grade. However, masters of medicine at these levels have long been lost to history. Even those who can craft Ninth Grade pills are extremely rare.

The "Grand Medicine Compendium," as the life's work of a Medicine Immortal, contains the top-tier and long-lost prescriptions of this world. It's even rumored that it holds the true essence of breaking through the shackles of the "Mortal Rank"!

If one could fully comprehend this book...

Just the thought of it made Su Jinxi's fur stand on end.

But... this isn't something just anyone can read.

Although Senior Gu doesn't seem to care about this book now, Su Jinxi can't pretend to be so indifferent. The value of this Grand Medicine Compendium far surpasses all the treasures of heaven and earth in his large medicine cabinet.

"Little Xi, don't move around recklessly, or you might hurt yourself."

Gu Heng's voice came from the back room.

Upon hearing this, Su Jinxi immediately stopped fiddling around.

"I'd like to know how many more of these earth-shattering treasures you have..."

Her attempt to sneak a peek at the Grand Medicine Compendium was definitely noticed by Gu Heng, but the warning came a bit late. If he had said something earlier, Su Jinxi wouldn't have dared to open the book at all.

At the Tribulation Crossing stage, she wasn't qualified to touch such treasures related to "Immortals."

"Never mind, I'll cook something for her to drink."

He was sorting through a pile of "useless items" he had made while practicing system skills, categorizing them into the system backpack. Suddenly, he heard a loud noise from the outer hall. It must be that mischievous cat causing trouble again, probably bumping into the table corner.

Raising a cat is certainly full of joy, but sometimes they can be quite rebellious.

However, Gu Heng had been taking care of this little cat for a few days now. She didn't eat much, only drank the medicinal soup he cooked. Gu Heng knew that the soup he made had a filling effect, but the fact that the cat accepted it made her quite easy to care for.

With this thought, Gu Heng stopped what he was doing. The stove in the back room was still burning. He took the leftover herbs from the outer hall and casually tossed them into the pot to cook. It was ready in no time.

He added sugar on purpose.

"Little Xi, come back."

Gu Heng called out, and Su Jinxi came bounding over. Seeing the soup on the table, she didn't hesitate and buried her little cat head into the bowl.

Seeing her settle down, Gu Heng continued tidying up his things.

In the night, Meng Yirou and Bai Fei'er arrived above Greenwood City. Following Bai Fei'er's guidance, they landed on the street beside Gu Heng's Medicine Hall. They didn't land directly at the entrance because Bai Fei'er said that the senior disliked noise and preferred tranquility, so Meng Yirou was also very cautious.

"Miss Fei'er, you are a prodigy yourself. I am willing to believe you to some extent, but..."

Meng Yirou looked at Bai Fei'er, her expression quite conflicted.

She still had doubts in her heart because, on the way here, Bai Fei'er had told her that Senior Gu had refined the "Star-Moon Divine Water" in about the time it takes to drink a cup of tea!

Who would believe that!?

Meng Yirou, at only nineteen, was already a Sixth Grade Alchemist and a direct disciple of the Divine Medical Palace's master. Although she couldn't refine the divine pills and elixirs on the "Divine Medicine List," she had observed the true masters of medicine at the Five Regions Alchemy Tournament.

The Ninth Grade Alchemist known as the "Desert North Medicine Emperor" had taken nearly a hundred days, with the help of six Great Ascension stage experts, to dissolve three kinds of herbs at the Five Regions Alchemy Tournament. He then spent another thirty-seven days refining a small jade bottle of Star-Moon Divine Water, which caused a celestial phenomenon upon completion!

That small jade bottle of Star-Moon Divine Water was immediately auctioned off at a high price by numerous experts.

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Meng Yirou still couldn't forget the shock of that scene.

Initially, Meng Yirou thought that Senior Gu had taken out the "Star-Moon Divine Water" to treat her. But Bai Fei'er told her that Senior Gu had refined the divine medicine ranked 11th on the Divine Medicine List in a regular iron pot in the time it takes to drink a cup of tea?

And she had seen him crush a ten-thousand-year-old Eternal Life Ironwood with his bare hands?

Meng Yirou would never believe it.

"If the Saintess doesn't believe it, you can see for yourself. It's just that the senior has been living among mortals for a long time, and it's hard to tell he's a master. I was full of doubt at first, but seeing it with my own eyes, I had to believe."

Bai Fei'er smiled wryly. She had never deceived Meng Yirou, but this matter was truly extraordinary.

Moreover, she wouldn't dare to deceive about such a thing.

"Fine."

Meng Yirou shook her head. "Since you are so certain, I must see it for myself."

With that, she headed toward Gu Heng's Medicine Hall.

Bai Fei'er quickly followed.

At the entrance, the old-fashioned appearance of the outer hall made Meng Yirou feel that this didn't seem like the residence of a Hidden World Master. She walked in, glanced around, and couldn't discern anything unusual.

"Miss Fei'er, you mentioned that the senior has a Nine-Lives Demon Cat as a pet, but I don't see it."

Meng Yirou looked around but didn't see the "senior" or the Nine-Lives Demon Cat Bai Fei'er had mentioned.

"Perhaps the senior has gone out."

Bai Fei'er was also a bit hesitant, seeing the expression on Meng Yirou's face, which seemed to be growing dissatisfied.

"Well, I hope I didn't come here for nothing."

Meng Yirou squinted her eyes and looked at the medicine cabinet nearby.

She walked over, intending to see what kind of "treasures of heaven and earth" were stored inside.