Gudu University, student dormitory.

At noon, Shi Yu returned to campus.

Back in his room, Shi Yu took an ice-cold shower, ate an ice pop, and contentedly flopped onto his bed.

"Ying."

Eleven also held a basin of milk-flavored ice cream, eating with relish.

This ice cream was made from frozen breast milk of female Iron-eating Beasts, a product of Senior Lin's family, and all Iron-eating Beasts praised it.

"Yiya~ hic~"

As for Ginseng Baby, it was gulping down ice-cold soda.

If Eleven's food had some nutritional value, what it drank was purely junk food.

However, according to Ginseng Baby, it was already very nutritious, so drinking something refreshing was all that mattered.

Along the way, Shi Yu and his team were all influenced by Little Red Eyes and craved icy things.

Unfortunately, Buggy didn't have a mouth and could only continue its world-famous painting, Buggy Sleeping.

"Mi~"

After arriving in the new environment, Little Red Eyes undoubtedly burrowed into the refrigerator again, clutching its ice-type energy crystal.

Shi Yu didn't worry about the risk of the refrigerator burning out and yawned, looking at the courses after the official start of school the day after tomorrow.

But as he was looking, a video call popped up on his phone.

"Huh."

Shi Yu glanced at the ID and saw that it was Senior Lin, then directly swiped to answer.

A moment later, Lin Xiuzhu's face appeared on the screen.

Her face was very close, and her expression looked excited, her eyes revealing joy.

"Big, big, big super big discovery!"

Lin Xiuzhu went straight to the point: "I have two good news, which one do you want to hear?"

Shi Yu blinked.

"Let's hear the second best one first."

Lin Xiuzhu smiled and said, "I've already figured out a way to stably awaken the 'Gigantification' skill in Iron-eating Beasts before they evolve."

"Really??" Shi Yu asked in surprise.

"Yeah, it's just that the resources used are a bit expensive, but compared to the evolution materials, it's still okay."

After confirming that the amount of evolution materials determined the potential of the Iron-eating Beast after evolution, Lin Xiuzhu had been studying how to awaken Gigantification in Iron-eating Beasts before evolution.

If it could be researched, it would be a significant improvement for the potential of the Iron-eating Beast race.

It meant that as long as you had money, every Iron-eating Beast had a chance to reach the high-level monarch race.

"Awesome, awesome." Shi Yu praised.

Master Lin Hongnian had researched a skill manual for Iron-eating Beasts to learn Thunder Palm and Cannon Fist.

Now Lin Xiuzhu had also researched a skill manual for Iron-eating Beasts to awaken Gigantification.

This father and daughter were indeed very talented in their research on Iron-eating Beasts.

Iron-eating Beasts were going up in price +1, was he just waiting to collect money?

"Wait, there's even better news than this?" Shi Yu spotted the key point.

"Hehe." Lin Xiuzhu's expression was smug, and she said, "I've also found a way to quickly improve the 'Hardening' proficiency of Iron-eating Beasts."

"Within the breeding base, a juvenile Iron-eating Beast, using this method, reached the proficiency level of Hardening in just one week."

If Shi Yu was only slightly surprised when Senior Lin said she had researched a method to awaken Gigantification, he was now very shocked.

"How did you do it?" Shi Yu looked stunned. Senior Lin was too strong.

Four years of breeding and research weren't wasted.

If a way to quickly improve Hardening proficiency was really found, then Iron-eating Beasts could be evolved in batches.

At that time, the status of Iron-eating Beasts would rise again!

Shi Yu originally planned to study it himself when he had time, but one was that he didn't have time for the time being, and the other was that he had more important tasks at present, such as exploring the second stage evolution of Iron-eating Beasts.

However, in the blink of an eye, Senior Lin had researched it?

"Do you remember that the research paper on the evolutionary form of Iron-eating Beasts mentioned that the Hardening substance of the Jiuli War Beast is slightly different in internal structure from the Hardening substance of the Iron-eating Beast?"

Shi Yu nodded.

"The key point is this."

"The Hardening of the Jiuli War Beast has a 'nourishing' effect on the Hardening of ordinary Iron-eating Beasts."

"Using the characteristics of the Hardening skill, such as outward release, flow, and application, the Jiuli War Beast can use its Hardening substance to nurture the power of the little Iron-eating Beast."

"Under nurturing, as long as the Hardening energy flows around the little Iron-eating Beast's body once, the amount of Hardening and the control ability of Hardening can be quickly improved."

"I've already experimented with my father's Jiuli War Beast, and its Hardening even has a promoting and strengthening effect on my Iron-eating Beast's perfect level Hardening."

"In other words, as long as a Jiuli War Beast puts all its energy into constantly strengthening the Hardening of another Iron-eating Beast, then the Hardening speed of that Iron-eating Beast will theoretically be very fast, and the upper limit that can be improved is very high, depending on the Hardening level of the Jiuli War Beast!"

Shi Yu: "!!!"

"This is indeed a super big discovery..." he said to the screen with a stunned expression.

This was no different from the empowerment and body tempering in wuxia novels!

The Hardening skill could be played like this?

No wonder there were so many Iron-eating Beasts mastering high-level Hardening in the stone wall images.

As long as a big shot takes them to level up, a Hardening Iron-eating Beast Legion with high proficiency can indeed be cultivated with some time!

"Is there anything you need me to do?" Shi Yu asked.

"Doesn't the Iron-eating Beast Research Institute at Gudu University still have three Iron-eating Beast cubs?"

"Zheng Yingjie and the others are taking care of them."

"Yeah." Shi Yu nodded.

Lin Xiuzhu: "Can you take them to verify it again to see if Eleven can help them improve their Hardening level."

"Easy to say." Shi Yu nodded. He would try it even if Lin Xiuzhu didn't say it.

If transcendent Hardening could help Iron-eating Beasts strengthen their Hardening substance, what about his Eleven's max-level Hardening?

He felt that there must be at least one Jiuli War Beast with max-level Hardening in the Iron-eating Beast Legion he saw.

"Thank you."

"Then I'll go now. If it works, Senior, come to Gudu again when you have time, and I'll have Eleven help your Xiao Hehua improve her Hardening proficiency." Shi Yu said.

"Okay." Lin Xiuzhu smiled.

...

"Eleven!!"

Eleven had just finished eating the basin of milk ice cream and was about to do a ten-thousand-meter high-altitude drop training when Shi Yu stopped it.

"Hmm!!" Eleven scratched his head.

What's wrong?

"Stop training for now and do an experiment with me to see if you have the potential to take care of children."

"Ying?" Eleven was confused.

It was only two years old, it was a child itself.

"Let's go, I'll get you a student card by the way. Then you can go to the gravity room, charging room, competition tower, and other training facilities by yourself."

"!!" Eleven's eyes lit up.

"Aww Ooo Ooo!!" It cheered.

After looking at the training facilities of Gudu University a few days ago, Eleven liked them very much.

In the gravity room, the indoor gravity can be freely adjusted, five times gravity, ten times gravity, twenty times gravity. Eleven had only done weight-bearing training before, how could it have experienced such high-end training methods in a gravity training room maintained by mechanical life.

It was just a pity that because Shi Yu didn't have time, he only took it to the charging room of Gudu University temporarily.

Now, hearing that Shi Yu was going to get it a student card so that it could go to various training facilities by itself in the future, Eleven was extremely excited.

That's right!

It was already a mature pet beast and could already swipe its card to train by itself.

Next, Shi Yu started heading to the Iron-eating Beast Research Institute.

Because he was worried about Little Red Eyes being at home alone, he also dragged the sleeping sword spirit from the pile of ice cream.

Hardening can drive Hardening...

Along the way, Shi Yu first found it magical, and then felt it was understandable.

Judging from various historical traces, Iron-eating Beasts should have a strong sense of collectivity and a legion-style combat style.

They were closely connected with each other, as could be seen from the "Impregnable Defense" skill.

Although Shi Yu had not had time to add points to Eleven's "Impregnable Defense", he had a clear understanding of the characteristics of this skill.

This gold-type skill was described as being guarded by the power of gold, enhancing all-round resistance, and having a resistance effect on elemental, physical, mental, and soul damage.

This was undoubtedly a very strong skill, but if that was all, wouldn't it be more appropriate to call it "Golden Guardian" than "Impregnable Defense"?

The ancients named this skill Impregnable Defense for a simple reason: because after reaching the proficiency level, it would become a resonance skill.

It was nothing special for one pet beast to use Impregnable Defense, but if another pet beast next to it also used Impregnable Defense, then the Impregnable Defense skills of both parties would resonate. Although it wouldn't reach the exaggerated effect of superposition, it would strengthen each other.

Moreover, the resonance effect and the number of resonances would increase with the improvement of skill proficiency.

Imagine, if there was a pet beast army of hundreds, thousands, or tens of thousands, all of whom mastered the Impregnable Defense skill, what would be the effect of 10,000 Impregnable Defenses strengthening each other when they fought? Although this was only a high-level skill, its tactical value was no less than any transcendent skill!

This was a skill that became more and more powerful the more people used it. It was specially created for war, a legion skill. Combined with Latent Sharpness, Gigantification, and Hardening, it could easily create an invincible army.

In ancient times, Impregnable Defense referred to solid walls and heavily guarded moats. It was undoubtedly very appropriate to compare the pet beast army that mastered this skill to this.

"It's a pity that I only plan to train one Iron-eating Beast, so the Impregnable Defense skill is useless."

He couldn't cultivate an Iron-eating Beast Legion just for one skill, as if he was about to launch a war, Shi Yu sighed, thinking about it.

This was a single high-level skill and a group transcendent skill... Only group operations could maximize the effect.

"Unless..." Shi Yu pondered slightly. It wasn't impossible to not waste it. One was to let Buggy cooperate and materialize a bunch of teammates who mastered Impregnable Defense, and the other was to just teach Eleven a matching clone skill...