The portable grandfathers that appear are all problematic.

Given Fafnir's current level, Xue's Law estimates that she might struggle to even score 500 points on the middle school entrance exam, let alone the college entrance exam. As for achieving an exam miracle in just over half a month?

Xue's Law couldn't be done by himself. He felt that if he studied it, he might be able to go from zero foundation to 500 points in the college entrance examination in half a year, but he thought half a month was too little.

However, Fafnir is a half-elf after all, so perhaps she really has a great advantage in areas such as memory. Besides, she chose to study politics and history, so she can basically get high scores by rote memorization. The only subject she needs to worry about is mathematics.

I can indeed take some time to teach Schrödinger's law in mathematics.

I don't know how Fafnir managed to get that adult college entrance exam spot. She looks like a middle school student at most, and she probably has some strange abilities. But since she's registered, Xue Luding plans to teach her a little when he has time.

After all, he had just finished the college entrance examination not long ago, and he had also received the memories of a doctoral student from a parallel world. This is probably the peak of his intelligence in his life, and his intelligence may gradually decline in the future.

If he were to pursue a direct PhD like his parallel universe self, it might take even longer, but he no longer has any plans to do so.

Right, Xue Dinglu suddenly thought of the parallel world. He really needed to go there to deal with the divine tree on his body, and also to discuss some matters concerning the apostles and mind flayers with the dragons.

The dragons have too much information about mind flayers and apostles; Xue Dinglu only skimmed through it last time he visited.

With that in mind, after recommending some exam preparation books to Fafnir, he skipped his class again and set off for a parallel world, the world of 2028.

……

"Wait, buddy, are you really that good at medicine? Is your medical doctorate just for show?"

"I studied disaster medicine for four years in college, not five years because disaster medicine is only a four-year degree program. Then I did a 3+2 combined master's and doctoral program in clinical medicine at Boston University, and now I have a double doctoral degree in clinical medicine and biology. So tell me, is my medical degree real or fake?"

When Xue arrived, he saw Doctor Xue and another Greek man bickering, while in front of them was a surgical scene where an arm looked as if it had been ripped off and was being reattached.

Just now, the Greek hero seemed to doubt Doctor Xue's medical skills and questioned him here.

“You can doubt my character, but I graduated with a proper 4+3+2 PhD. At most, I only missed a year in my combined Master’s and PhD program, but I immediately got my PhD in biology as well. After my phage paper was published, I am now an emeritus professor at Boston University. Show some respect for my abilities!” Doctor Xue pushed aside the Greek man with great dissatisfaction and began the arm transplant surgery.

“But I saw that Xerath healed this kind of injury with just a touch, while you have to go through all that fancy bone and nerve setting. Why don’t we go find those dinosaur people? Their healing magic is probably better than your surgery,” the Greek complained.

"I've said it countless times, the essence of healing magic is to stimulate cells to divide faster, it can't regenerate severed limbs! If you want healing magic, wait until I've reattached my arm and nerves before you go to the dragons."

The two were arguing and bickering, while the one-armed Greek hero on the operating table slept peacefully.

Xue Lude looked at it and realized that this hero seemed to have been trained by Aphrodite, but he betrayed her later. After all, Aphrodite's reputation had always been very bad, and he was also a hero who died fighting a sea monster on the Sky Thunder.

And now, he has lost an arm.

Upon seeing Xue's Law, the Greek man next to him said, "Xue Diles, quick, quick, cast a healing spell!"

Xue Law: "..."

"How did this happen?" Looking at the severed arm, it was quite gruesome. The entire arm, along with the shoulder, had been torn off, as if it had been ripped off forcefully. It looked painful.

“Alas, recently some plant monsters have learned that we are intentionally hunting them, and they are constantly evolving, now they have even learned to set traps,” the Greek hero explained.

“We accidentally fell into a trap. Before our armor could even activate, Kronas lost his shoulder, and I was shot through the abdomen. We only managed to defeat the enemy after Achilles and the dragons arrived to help us,” he explained, while lifting his clothes.

There was a wound on his abdomen wrapped in bandages. It seemed he was lucky; although it was a penetrating wound, it did not hit any vital organs.

As for the hero named Kronas, he was in a terrible state, losing half of his shoulder.

"Is the combat intensity of clearing out those plant monsters really that high?" Xue Luding stretched out his hand, and the cursed blood began to cover the hero's wounds, while Doctor Xue from the parallel world cooperated by putting the severed arm's bones and muscles back into place.

"Pretty much. The intensity of the battles has been increasing recently, so we are also considering further cooperation with the dragons, which means that each of us will be accompanied by a dragon warrior responsible for combat."

After chatting, the arm was reattached, and soon Xue Dinglu also treated the hero.

"Xue, the car is ready. The negotiations for further cooperation with the Dragon Clan will begin in an hour," Hector's voice came from outside.

Chapter 299 The Lonely Guardian

What a coincidence! Xue Dinglu just arrived here and is about to meet the Dragon Clan.

Following the big truck to Salem, along the way, it was as if we were running over a speed bump, and we ran over and killed another plant monster.

Xue's Law once again realized just how annoying the more than 6 million plant monsters in this world were. They had even reached the point where they could injure Greek heroes. He couldn't tolerate it any longer and had to take drastic measures.

Of course, Xue's Law has not forgotten the Earth in the main world. There is still a sacred tree that has been growing for more than 6000 million years under Boston.

That thing was even more of a headache for Xue's Law.

It has now been discovered that bacteriophages have some restraining effect on the Divine Tree, but this restraint is limited when faced with the Divine Tree's enormous size.

Wherever the bacteriophage infects, the Divine Tree can simply cut off the corresponding location and everything will be fine. And coincidentally, the Divine Tree in the underground world is almost everywhere in the underground river, endless in number. The bacteriophage can only fight against the creatures of the Divine Tree alone.

If you release a bacteriophage into the wild, it will probably die within minutes.

Meanwhile, the spread of bacteriophages is limited. For example, in the Holy Kingdom, the Destroyer used his cursed blood to form a fist blade and beat the Divine Tree for several hours before the bacteriophages were completely infected. By then, the battle had already ended.

Xue was reviewing the previous battle, while the truck was driving on the highway.

At this moment, Doctor Xue suddenly said, "I want to use bacteriophage technology to make corresponding weapons, such as bacteriophage bullets and bacteriophage poison gas bombs."

He looked at Xue Dinglu and earnestly shared his thoughts.

"Can bacteriophages be incorporated into conventional weapons?" Xue Dinglu suddenly asked.

The bacteriophages specifically targeting the Divine Tree are highly specialized, sacrificing all other survival abilities and environmental adaptability in exchange for a unique infectivity against the Divine Tree.

This bacteriophage is similar to a laboratory supervirus. Any microorganism in nature could easily defeat it, but inside the Divine Tree, this bacteriophage can even infect a level 5 Divine Tree.

This is a product modified from the cursed blood for special circumstances. Xue Law also uses the cursed blood as a protective shield for the bacteriophage when using the power of this bacteriophage.

Doctor Xue immediately complained, "It's difficult to apply to conventional weapons, which is why I need your cooperation. The most important thing is that I need your ability to modify microorganisms."

"Cursed blood?"

"Exactly."

After some consideration, Xue's Law still managed to separate out the degraded version of "Pseudo-Curse Blood".

"Thanks!"

The False Curse Blood only has two functions: condensing blood into weapons and manipulating biological characteristics through blood. It does not have the ability to absorb suffering or arbitrarily modify organisms, so distributing it is not a big problem.

Not long after, the truck stopped in front of the town of Salem. After the group got out of the truck, Xue Dinglu parted ways with them.

Xue's Law needed to go to the Dragon Clan's library, where they were going to negotiate.

When Xue Dinglu returned to the area, he was astonished to find that the entire mountain was completely different from before.

The entire mountain has been processed and decorated, and it appears as if the 1600-meter-high mountain has been carved through from the inside.

The dragons appear to be cave-dwelling creatures; they would dig out areas they wanted inside mountains and then build and decorate the caves they dug out.

This gave rise to a very novel architectural complex, with the entire mountain covered with caves. The dragons would deliberately use bronze to make doors and other decorations for each cave entrance, and these were closely connected to the surrounding reinforced mountain.

Looking out, Xue Dinglu felt as if he had arrived at the Ten Kings of Hell, with tens of thousands of bronze gates densely covering the entire area from the foot of the mountain to the top.

Xue Luding also found it novel. Not long after he arrived, the giant dragon playing with mud at the gate immediately put down the little figure it had made of mud and shouted into the cave: "Elder, elder, the son-in-law is here again!"

"I told you not to call him son-in-law, show some respect, call him Your Highness!" A roar came from inside the cave.

Xue Law: "..."

The dragon race remains so abstract.

Soon, a dragon elder arrived before Xue Luding, smiling as he said, "Your Highness, how have you been?"

Xue Daolu got straight to the point, saying he was there to investigate the Apostles and Mind Flayers, and the Dragon Ball Elder immediately assured him and led Xue Daolu to the library.

Then, several other small dragons guarding the data, along with the old dragon, helped Xue Lude search, and in just over ten minutes they found the information they wanted.

And it was truly confirmed that the original master of both the Dragon Clan and the Mind Flayer was the Fourth Apostle, that woman who was over three meters tall.

She is also a Duke-level Apostle, and should even be among the top five in the entire Mist Council.

A duke-level apostle is far stronger than an ordinary apostle.

No wonder Tyrannosaurus God only dared to contend with the Fourth Apostle after completely controlling the world's consciousness and draining it to cultivate tens of thousands of fifth-order primordial dragons.

All the dragon kings in the Dragon Tomb are at most only at the level of barons, and the difference in strength between them and apostle dukes may be thousands or even tens of thousands of times.

If it weren't for the authority of the world, even if all the dragons in the Dragon Tomb were filled in, they might not be able to harm the Fourth Apostle in the slightest.

“I think I understand now,” Xue Dinglu said.

Putting away the documents in his hand, he saw the dragon elder, and Xue Luding thought of something else.

In his hand, a branch slowly grew out, a sight that immediately startled Elder Long.

"This...this...this..." The old dragon seemed to be completely terrified.

"This is the Divine Tree, and I sealed it within my body," Xue Dinglu said.

Elder Long immediately looked at Xue Dinglu with a look of utter disbelief, his expression a mixture of shock, confusion, and disbelief, like a pie chart.

Ignoring the elder's exaggerated expression, Xue Luding plucked a branch, handed it over, and asked, "Can you eat this stuff?"

Shouldn't the dragons' diet include tree roots?

"Yes!" the elder replied immediately, then took the branch as if it were a treasure and asked directly, "Can I try it?"

Although they have been the fruit farmers of the sacred tree for millions of years, there are not many instances of the sacred tree stealing fruit from it. After all, the sacred tree also has a temper, and such behavior is easily discovered.

Therefore, for the dragons, secretly collecting fallen leaves and withered branches from the divine tree is already a great treasure. In fact, the greater purpose of these treasures is to cultivate their own dragon blood fruit and create food suitable for the growth of their baby dragons.

As for directly hugging and gnawing on a fresh sacred tree, they really couldn't have dreamed of such a good thing.

After receiving repeated confirmation from Xue's Law, the old dragon tried biting into the branch.

The next instant, Old Long's ancient-style clothes tore apart, his muscles bulging as if inflated, stretching the clothes to the point that they burst open, instantly exposing his muscular physique to Xue Luding.

Xue Law: "..."

He didn't give the elder the original divine tree, but rather a branch of the divine tree infected with bacteriophages. He wasn't sure how much of an impact the bacteriophages would have on the dragons.

"How is it?" Xue asked.

"Extremely fresh, extremely delicious! It even has a unique fermented flavor, completely different from the original divine tree's taste, but even more flavorful." The elder commented like a food critic.

"What surprised me the most was that although the microorganisms destroyed the original energy structure of the divine tree, they made that energy easier to absorb, and there was no longer any risk that the divine tree would attack its master in the stomach. This is the most delicious food I have ever eaten in my life!"

The elder's face was flushed, and his muscles seemed to come alive, making Xue Dinglu's eyelids twitch.

It seems that the dragon race can accept not only the divine tree, but also a divine tree infected by bacteriophages.

Perhaps to them, the original sacred tree was like hard bread—delicious but easy to break your teeth and even difficult to digest.

The divine tree infected by bacteriophages is like golden soft bread with added yeast, an indescribable delicacy and deliciousness.

This put Xue's law at ease.

So he said, "I have a sacred tree here with roots exactly like this one. Would you be willing to help me clean it?"

"By the way, that divine tree hasn't completely lost its vitality yet. There's still a risk of it going berserk, so you need to control and suppress it from time to time. You also need a large number of people to guard it and gnaw on it." Xue Dinglu pointed out the problem with the divine tree. He felt that even if tens of thousands of dragons gnawed on the divine tree, it would take a long time to finish it.

Similarly, the plant monsters throughout the world would need to be eaten one by one like snacks, which would make clearing this divine tree even less efficient.

"Yes, yes! By the way, Your Highness, now that you've covered the benefits, what about the price?" The elder immediately fawned like an Akita dog.

The dragon's tail behind him was wagging so hard it was almost leaving afterimages, like a dog's tail.

Xue Law: "..."

Old Long never expected that good things would come one after another after returning home. First, he found a strange plant that looked like a baby ginseng in his hometown, and then just a few days later, a sickly and completely subservient divine tree appeared.

Where would he get so many benefits when he was just scraping by working for the apostles! He even had a feeling of unreality, wondering if he was dreaming, and slapped himself.

It hurts a lot, it's not a dream!

No wonder our ancestors were so eager to go home. This place is amazing. Although there is no magic in the air and water, with the ginseng baby and the divine tree, who would care about the tiny bit of magic in the air and water?

They're too lazy to even take such a small amount, afraid of losing their dragon!

And Your Highness, you'd better hurry up and state your terms, otherwise he'll feel like this thing is too hot to handle.

"Oh, Your Highness, please sit down. Little Tuolong, go and pour His Highness a cup of dragon blood fruit tea, the best quality one. I'll go and fetch the Silver Dragon King right away." The elder immediately reassured Xue Dinglu, then flew away from the library.

Xue Law: "..."

In fact, the Divine Tree was purely a burden to him. He couldn't absorb the energy of the Divine Tree, and on the contrary, the Divine Tree within his body required the blood of curses to cultivate bacteriophages and suppress it at all times.

Over time, he even felt like Kakashi with the Sharingan installed, which is why he wanted to throw this thing away as soon as possible.

Conversely, what is garbage to Xue's Law and the world is an unimaginable treasure to the dragons.

It can only be said that this is actually a mutually beneficial relationship.

And then I looked at this library, deep in the winding cave. I don't know why, but the ancestors of mankind, the scattered rats, survived to the new generation by digging holes underground. Now, however, humans prefer to build houses on the surface, while the dragons have started to dig holes in the mountains.

It's like the two poles have been reversed.