The master, being compassionate, could not bear to see the volcanic rock toad become extinct.

After searching all over Shenyu Mountain, a suitable location was finally found here, and lava was channeled into the cave, creating a suitable living environment for the volcanic rock toads.

The book does not explain how the master managed to draw lava into the cave.

Su Ruojin guessed that Shenyu Mountain should be a dormant volcano. The master used some method to divert the magma from underground to this place and created a magma circulation system to ensure that the volcanic rock toads could reproduce and thrive here.

Volcanic rock toads have an exceptionally difficult time reproducing; although they look very much like frogs, they are viviparous.

They can only give birth to one child at a time, and even then, the child has a very low survival rate.

Master Xuanyuan originally wandered around, but he stayed behind for the volcanic rock toad.

Later, an eared mouse appeared out of nowhere to keep him company, and the man, the mouse, and a pair of volcanic rock toads made their home there.

The red grass in the cave is called the "Food-Sucking Grass," which can fill you up when eaten, and its flowers can accelerate wound healing.

Seeing this, Su Ruojin couldn't help but look up at the little ball of flesh that was sleeping soundly against Xiao Yanchu.

It turns out that this little creature has lived for at least six hundred years and has been with Master Xuanyuan for many years. No wonder it is so intelligent and perceptive.

Su Ruojin continued reading, wanting to know how to catch the volcanic rock toad and how to get out of there.

Su Ruojin frowned as she read the next part.

Master Xuanyuan did not say how he caught the volcanic rock toad, but he wrote that he set up the Qiankun Guardian Array to protect this place, and that he himself entered and exited through the bottom of that pool.

However, the bottom of the pool is now blocked by a large rock, and it is impossible for her and Xiao Yanchu to move that rock.

Are we really going to be trapped in this cave and never get out?

Although there was the Abundant Grass and the spring water introduced by Master Xuanyuan in the cave, so survival was not a problem, there were many people she was involved with outside.

If her grandmother knew she was missing, she would be heartbroken.

The back of the book contains Master Xuanyuan's insights on cultivation.

Each entry in the book is marked with a time. Based on the time, Master Xuanyuan lived in this cave for more than 30 years before leaving for unknown reasons and never returning.

Su Ruojin got up and went to the bookshelf to check. The bookshelf was full of bamboo slips, mostly scriptures, and some were Master Xuanyuan's annotations on the scriptures.

Su Ruojin saw a bamboo scroll with the inscription "Annotations on Shenyu Herbal Medicine".

She's a doctor, so naturally she's interested in these kinds of books.

Upon opening it, one finds labels detailing the appearance and effects of rare medicinal herbs from Shenyu Mountain, along with detailed descriptions of their growing locations, harvesting routes, and any nearby dangers.

Like the dragon scale grass mentioned before, this bamboo slip states:

Dragon scale grass, initially green, turns golden yellow after a hundred years. It has a remarkable effect on treating ulcers. It loves water and grows by clinging to trees.

The human-faced snake was pleased with it, but after being bitten, its entire body turned to stone and it died. There was no cure. It often lurked nearby, so be careful!

This is basically a map for gathering herbs in Shenyu Mountain.

With this bamboo scroll, any medicinal herbs available on Shenyu Mountain can be collected.

Su Ruojin flipped through the pages, wanting to see what other rare medicines Shenyu Mountain might have that she didn't know about.

Turning to the back, Su Ruojin's eyes widened.

Crane Rock Soil!

The bamboo slips actually mention Heyan soil!

Crane Rock Soil: The name does not match its reality; it is neither soil nor rock, but rather...

After reading Master Xuanyuan's annotations, Su Ruojin was both amused and exasperated. Who would have thought that Crane Rock Soil would be this kind of thing?

She remarked that perhaps everything is preordained.

It was destined that Xiao Yanchu's life would not end there.

Although the name "Crane Rock Soil" is somewhat misleading, it is not something that can be found easily.

It is even the most difficult of the five medicinal herbs to find.

Su Ruojin put the bamboo scroll of "Annotations on Shenyu Herbal Medicine" into her bag.

After thinking for a moment, she put the annotations written by Master Xuanyuan back into her bag.

If she can get out, send her to the temple.

The works of masters should not be buried; they should be seen by more people.

"Woof woof~"

Mao Mao, who should have been asleep, suddenly barked twice.