"What?"

Amid the chaos, Fang Xu turned his head and loudly asked Lü Yongchang, "Then why did this planetary fortress disappear?"

“It hasn’t disappeared,” Lü Yongchang corrected again. “It’s still in the same place, we just can’t see it.”

"As you know, the entrance and exit of a Klein bottle are connected."

"What if, I mean, what if we changed the basic architecture of the Klein bottle, integrating its inlet and outlet into a three-dimensional sphere?"

Fang Xu's expression shifted slightly, as if he had realized something.

"good."

Before Fang Xu could speak, Lü Yongchang began to answer his own question.

"All light can pass through this spherical space without any obstruction."

"Invisibility is just a side function of it."

"No attack at any three-dimensional level can penetrate this four-dimensional protective shield to reach this white dwarf fortress!"

"It's like... two-dimensional creatures living on paper, which are basically impossible to pose a threat to us."

"Then... what about the painting?"

Fang Xu asked in a daze.

[Drawing] How can a two-dimensional being cause harm to a three-dimensional object?

"[The painting]...Didn't you notice that all its attacks aim to reduce three-dimensional objects to two dimensions?"

"Only by converting a three-dimensional object into a two-dimensional one can it launch a truly meaningful attack."

"However, in most cases, a three-dimensional object that has been transformed into a two-dimensional object has lost its original structure, so there is no need to draw it."

"In short..." Lü Yongchang took a deep breath, "The gap between low-dimensional and high-dimensional is extremely large."

"Until we master dimensional attack methods, ordinary attacks are completely ineffective against this white dwarf fortress."

Fang Xu turned his head to look at the white dwarf fortress that had reappeared in the dark starry sky, glowing with a blue-white light, and his tone became strained.

"Then... what should we do?"

...

Lu Yongchang didn't speak, but just frowned as he stared at the image in the holographic projection.

The command center returned to silence, as if afraid that any noise would interrupt his thoughts.

"If the basic technology of the four-dimensional shield is the Klein bottle structure..."

"Then we actually have the ability to influence this shield."

As he spoke, he reached out and opened a brand-new holographic projection, on which he simply listed a few lines of descriptive formulas for the Klein bottle structure.

"I need some time."

Lu Yongchang whispered to Zhao Zijie, "In addition, confirm the status of the Imperial Fortress."

"Once the time is right, let [Ten] take control of the Imperial Fortress and make a move!"

"good!"

Zhao Zijie quickly issued several orders.

The holographic projection of artillery fire intensified, but... it did not cause any damage to the enemy ships.

The main strategy is to gain the upper hand by instilling a sense of momentum.

...

Time passed by, second by second.

The formulas and data in holographic projection gradually became sloppy and complex.

"Utilizing a large number of warp missiles..."

Lu Yongchang's voice was exceptionally clear in the quiet command center: "Activate the four-dimensional jump device ahead of schedule."

"The four-dimensional shield is disturbed through these small Klein bottle structures."

"Theoretically speaking, this is feasible."

...

What is theoretically feasible may not be practically feasible.

The Klein bottle formed by short-distance jumps and the Klein bottle that constitutes the four-dimensional shield are not products of the same level at all.

But... these are the only two attempts that human civilization has been able to make.

According to Lü Yongchang's calculation model, hundreds of thousands of curvature missiles formed a massive "array" under zero control.

As before, they all fired towards the area where the White Dwarf Fortress was located!

As they approached the boundary of the fourth protective shield, they simultaneously activated their short-range jump system!

In four-dimensional space, countless smaller Klein bottle structures suddenly emerged from a super-large twisted Klein bottle structure!

This undoubtedly undermined the stability of the large Klein bottle structure!

In the previously empty target star field, a faint blue-white light suddenly appeared—the White Dwarf Fortress revealed part of its true form!

but……

The faint blue-white light disappeared again in the next instant.

The four protective shields have returned to their original stable state.

Although it was only a change that lasted for a moment, it still gave human civilization a glimmer of hope!

"continue!"

Zhao Zijie, somewhat excited, issued the order: "Increase the number of warp missiles!"

"If 100,000 isn't enough, then 500,000! One million!"

...

Inside the White Dwarf Fortress.

[9436] Looking at the warning message on the screen, he let out a soft "hmm".

"This Enroget civilization..."

"You already have some basic understanding of dimensions!"

As it spoke, it waved its tentacles indignantly: "I knew 9527 was unreliable!"

"This is hardly a lucky Level 6 civilization!"

"We're almost at the seventh level of civilization!"

Companion [9435] quickly manipulated the light screen in front of him: "It's not a big problem."

"I have increased the output power of the four maintenance shields."

...

The previous miracle was not repeated.

Even though Zhao Zijie ordered a significant increase in the number of warp missiles, the four-dimensional shields of the White Dwarf Fortress remained completely unaffected.

Let's launch the Dandelion Project.

Lu Yongchang's voice came through: "While the enemy's attention is drawn to these warp missiles..."

"Professor, [Ten] has sent a message." The synthesized voice interrupted Lü Yongchang, "The Imperial Fortress has completed its resupply and arrived at the microcosm port, ready to enter the macrocosm and launch an attack at any time!"

Lü Yongchang pondered for a moment.

"Tell [Ten] to prepare for an attack."

"Once Dandelion leaves the fleet, immediately launch an attack on the White Dwarf Fortress!"

...

The artillery fire remained fierce, showing no sign of weakening.

The spacetime fluctuations caused by short-distance spatial jumps constantly appear in this star field, having a continuous but negligible impact on the four protective shields.

Under the cover of endless artillery fire, the Kuafu in the central area of ​​the fleet showed some unusual signs.

Under Zero's control, Kuafu unknowingly retreated to the rear.

Meanwhile, small starships gradually appeared at the microcosm port.

These starships are streamlined and have a shape very similar to shuttles.

These are the carriers of the "Dandelion Project"—the "Dandelion" Civilization Seed Ship.

In the Academy of Sciences' design, any of the Dandelion-class civilization-starting ships, after landing on a habitable planet, can elevate their civilization to level three within a hundred years.

They flew out silently from the microcosm port in neat formation and arrived at the side away from the White Dwarf Fortress.