Rapid Progress, Triple Domain

"No wonder those who possess a domain can claim to be nearly invincible at the Planetary Level."

Within the range covered by Yu Duan's domain, there is a certain degree of control over space and time.

Furthermore, after stepping into the Domain Level, even without expanding one's domain, the mere fusion of body, soul, origin energy, and will is enough to crush existences at the same level, multiplying combat power by more than tenfold.

If the domain is expanded, that combat power increases exponentially!

A moment later, Yu Duan's emotions calmed down, and his attention returned to the Book of Causality.

"The cost to advance the First Layer Light Domain is 100,000 hours of bathing in sunlight... that's about 11 and a half years."

Yu Duan frowned slightly at this efficiency, not particularly satisfied.

If it takes this long to advance a single layer of a domain, wouldn't the time required when touching upon deeper cosmic laws in the future be an astronomical figure?

"I must find a way to research and improve the efficiency of grinding this progress."

Yu Duan looked at the progress bar on the Book of Causality, which was barely perceptible yet indeed slowly creeping forward, then looked up, his gaze landing on the pale fluorescent tubes on the ceiling of the gravity chamber.

Clearly, artificial light sources could also provide a faint "progress," but the efficiency was outrageously low—the progress bar would only stingily jump by 1 second for every 10 seconds of light exposure.

"What if I switch to real stellar sunlight? Could the efficiency leap? Or... perhaps more powerful artificial high-energy rays?"

Efficiency is the primary problem, determining whether one achieves twice the result with half the effort or vice versa.

However, improving efficiency requires careful research and plenty of experimentation.

"I've been cooped up in the gravity chamber for ten days; it's time to go out and get some air."

Yu Duan stood up, stretched his limbs, and walked toward the alloy door of the gravity chamber.

"Hiss—"

The sensor door slid open to both sides, and Yu Duan saw Master Zhen Li and the other two standing at the entrance of the gravity chamber, their eyes burning with intensity.

"Uh... three seniors, I was just planning to find you and ask for guidance." Yu Duan's expression froze, and he quickly adopted a posture of seeking advice.

"I just had a breakthrough; it seems I've comprehended what is recorded in the documents as... a domain?"

Facing Yu Duan's question, Kun Zhu and Shen Jian did not speak, but instead turned to look at Master Zhen Li beside them.

Master Zhen Li let out a long breath, suppressing the excitement in his heart, and said, "That's right, what you have comprehended should be the legendary domain."

While speaking, Master Zhen Li raised his right hand, and a faint light shot out from the light-brain on his wrist, projecting dozens of translucent screens.

Each screen played a different battle video.

Countless lights and shadows intertwined, and terrifying energy tides raged; these were scenes of powerful beings in the universe engaged in fierce combat.

"These are videos of duels between powerful beings in the universe; what they are wielding... is the power of a domain!" Master Zhen Li's tone became involuntarily filled with awe.

"Yu Duan, you may not understand... even among Universe Level powerhouses, the vast majority do not possess a domain!"

Master Zhen Li waved his hand, and most of the screens disappeared, leaving only three playing battle videos.

The powerhouses wielding domains in the videos were almost identical to the Light Domain Yu Duan had just displayed, only with a larger coverage area and greater might.

"According to the preliminary analysis by 'Number One', what you have comprehended is indeed a domain, and it should be a 'Light' type domain!"

After Master Zhen Li finished speaking, he turned his gaze to Kun Zhu and Shen Jian, his tone resolute: "Yu Duan's talent is higher than we imagined. For this trip to the universe, I will stay behind to guard the tribe; let Yu Duan go."

"With Yu Duan's talent, if he can join a major power in the universe, his future will surely be limitless."

"As long as the tribe can produce one powerhouse, we can escape the fate of being a slave race!"

Clearly, Master Zhen Li had possessed the spaceship for longer and had a far better understanding of cosmic civilization than Kun Zhu and Shen Jian.

"Enter the universe? I have no problem with that." Yu Duan nodded immediately, his expression serious, "I will master the Universal Common Language as soon as possible!"

Master Zhen Li nodded repeatedly: "In that case, Yu Duan, follow me these next few days. Number One and I will explain the precautions for entering the universe; you must not be careless!"

Yu Duan nodded and said, "Then I will leave it to your guidance, Master."

Over the next few days, Master Zhen Li carefully explained various precautions to Yu Duan.

One point was emphasized repeatedly: never reveal that you come from an indigenous planet while out there!

Afterward, Yu Duan returned to his grinding state, testing various artificial light sources and even simulating stellar radiation of different intensities.

After tossing and turning for nearly half a month, he finally screened for the plan with the highest progress bar efficiency.

In the Light Source Star System, 2.4 million kilometers away from the sun, a disc-shaped single-person spacecraft floated quietly in space.

This was a small rescue craft equipped with the B6-level Chilian Star, only A6-level, with a narrow interior space that was inconvenient for movement and exercise.

Inside the craft, Yu Duan gazed into the distance at the Light Source Star, 79 million kilometers away. At this distance, that blue-green life-bearing planet looked as small as a speck of dust.

If it weren't for the fact that Yu Duan was a Planetary Level expert, it would have been difficult for a normal person's naked eye to observe the Light Source Star at this distance and under the interference of intense light.

"How does it feel? Can you adapt to the environment in space?"

A light screen was projected in front of Yu Duan, conducting a video call. On the screen appeared the bald, white-robed Shen Jian, a gentle smile on his face.

"It feels good. If nothing goes wrong, I won't need to return until my supplies are exhausted."

Yu Duan felt the scorching heat of the intense stellar rays piercing through the transparent shield and washing over him, and he smiled as he responded to Shen Jian.

In reality, Yu Duan did not feel good at all; being this close to the star, the terrifying high-temperature radiation within the cabin had caused the internal temperature to soar to a point capable of melting lead and tin, leaving the air searing and distorted, and the metal cabin walls too hot to touch.

For ordinary life forms, this was nothing short of a lethal oven.

For Yu Duan, while this temperature was not fatal, it was equivalent to an ordinary person engaging in outdoor activities under the midday sun at the height of summer—barely tolerable.

Regulating the temperature was a basic function for an A6-class Airship, but the efficiency of "grinding" progress was at its highest under these extreme heat conditions.

Shen Jian coughed twice, unable to hide his curiosity as he asked, "Ahem, Yu Duan, does this method really provide a bonus for comprehending a domain?"

"Personally, I feel there is a significant bonus. Of course, this method might not be suitable for everyone."

Yu Duan glanced at the progress bar of the Book of Causality, which was jumping; the efficiency had increased by 37 times.

At this rate, it would take less than 118 days to advance his comprehension of the Second Layer Domain.

And this was merely the most efficient plan devised under the current conditions.

Once he joined a major power in the universe later on, he would surely be able to find even more efficient schemes.

Shen Jian nodded, "Is that so? Then I'll communicate with Kun Zhu. I'll have him try cultivating in the Hundred Thousand Mountains to see if there's any benefit for comprehending the Earth Artistic Conception. I won't disturb you any further."

After hanging up the communication, silence returned to the cabin, leaving only the low hum of stellar light penetrating the shield and the omnipresent, suffocating heat.

Yu Duan turned around, facing the blazing star that filled the entire porthole as if it were about to ignite his very soul, feeling the stinging sensation on his skin and the thrumming of the power within his body accelerating under the light.

"Let's grind!"

Yu Duan grinned, sweat dripping from his chin onto the scorching floor, where it hissed and evaporated into a wisp of white smoke.

Amidst the extreme light and heat, Yu Duan's consciousness was immersed in the joy of the rapidly surging progress bar of the Book of Causality, and a near-maniacal smile appeared on his face.

The stars rotated in silence, and time slipped away quietly within the eternal radiance of the star.

In the blink of an eye, over three hundred days had passed.

Throughout these days, Yu Duan had remained in this purgatory near the star, continuously practicing and comprehending the mysteries of his domain.

On Light Source Planet, the seasons shifted and turned, and only three days remained until the First Day Festival of the New Calendar year 52.

"It's time to go."

Inside the airship, Yu Duan, who had been sitting cross-legged in meditation, suddenly opened his eyes, a brilliant radiance flashing within them.

In an instant, a triple-layered, resplendent, and overlapping hazy domain of light erupted from him, illuminating the deep void!

The light domain swirled, appearing as if constructed from countless fine prisms of light, nesting and reflecting off one another, turning the cramped cabin into something resembling a divine kingdom.

Within the range of the light domain's expansion, even the violent stellar rays seemed to be combed and tamed, taking on a strange, rhythmic cadence.

Light Domain—Third Layer!

More than 200 days ago, he had already "ground" the progress bar for the first layer of the domain, and without the slightest hesitation, he had directly advanced his comprehension to the Second Layer Light Domain.

The cost of advancing the Second Layer Light Domain comprehension was still bathing in sunlight, only the time required had doubled to 200,000 hours.

However, with the 37-fold efficiency boost, it didn't actually take 200,000 hours; it took only 225 days to successfully max out the progress bar.

Yu Duan had successfully become a Planetary Level powerhouse with a Third Layer Light Domain before even entering the wider universe!

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