Similar to Observation Haki

The Mt. Natagumo had only four demons left under Wang Xu's control.

His Spider demon "Father" possessed the Blood Demon Art of metamorph: The ability to metamorph by shedding his outer skin into becoming more powerful. In this form, his physical power and regeneration is increased, also becoming more durable compared to his original form

His Spider Demon "Mother" has the blood demon art of Spider Manipulation: Mother could create and command small white spiders with red dot-like designs similar to the physical traits of herself and her "family" to stealthily attach her threads to her intended victims without them noticing.

And spider demon "Daughter" Possesses the Blood Demon art of Acid Manipulation: daughter can manipulate and generate acid made from her own blood and flesh. The acid she creates can easily dissolve a person, though the process is somewhat slow.

Spider demon "Son" had the Blood Demon Art of Poison Manipulation: Son's most potent and dangerous ability is his power to generate and manipulate deadly poison.

Wang Xu eliminated all other demons in the Mountain because they were too weak.

Since his transmigration, Wang Xu completely replaced Rui, easily stripping all demons of their lives in the Spider family.

However, Wang Xu was most worried about Muzan because he could also easily take the lives of all demons.

As time passed, Wang Xu discovered that perhaps due to transmigration, he had escaped Muzan's control.

Though he couldn't articulate the feeling, it was real.

His body wasn't restricted, and after absorbing Rui's power, he could continue to grow stronger through training, such as the Blood Demon Art.

For a whole year, he didn't leave the Mountain.

However, the need to consume humans remained unchanged. Initially hesitant, he found it surprisingly delicious after tasting it.

Moreover, eating humans accelerated his strength gain.

In this year, both in soul and mind, he completely transformed into a demon.

The peaceful days were expected to continue until a few days ago when a group of Demon Slayers invaded Mt. Natagumo, followed by the appearance of Tanjiro and others.

This alerted Wang Xu, who thought that by consuming important characters like Tanjiro, he could become even stronger.

Most importantly, Wang Xu wanted to devour Muzan to become the strongest demon, while figuring out a way to overcome the significant weakness of sunlight.

Essentially, his thoughts and goals aligned with Tang An's.

Because Wang Xu also knew the plot, the only regret was that he didn't have a system's in-built golden finger, he only has a sixth sense.

This sixth sense is akin to Observation Haki in One Piece, which allowed him to predict, perceive, and observe.

Undoubtedly, this sixth sense was Wang Xu's golden finger, as it was exceptionally strong.

A wave centered on Wang Xu rapidly covered the entire Mt. Natagumo, with a detailed map appearing in his mind.

Father was battling with Inosuke.

Mother was manipulating Demon Slayers into infighting, while Tanjiro was on his way.

Son was about to clash with Zenitsu.

Only Daughter hadn't made a move yet.

The entire Mt. Natagumo was under Wang Xu's control.

The scene rewound to an hour ago at the Demon Slayer headquarters.

A crow hurriedly flew into the room and spoke.

"Mt. Natagumo has one of the Twelve Demon Moons; requesting support."

"Mt. Natagumo has one of the Twelve Demon Moons; requesting support."

The appearance of the crow halted the nearly concluded meeting.

"Mitsuri, Shinobu, you're in charge of this mission."

Kagaya addressed Mitsuri and Shinobu.

"Yes."

Mitsuri and Shinobu stood up, preparing to head to Mt. Natagumo.

Tang An followed Mitsuri since he was her Tsuguko. Additionally, outside the courtyard, Shinobu's Tsuguko Kanao was also present.

In the original story, this mission was undertaken by Shinobu and Giyu. However, this time, Giyu was replaced by Mitsuri.

Tang An knew his presence influenced the plot.

Indeed, transmigrators were like viruses.

During the recent meeting, Kagaya wanted Tang An to become a Hashira, but Tang An refused.

So, Shinobu, accompanied by Kanao, and Mitsuri, accompanied by Tang An, swiftly headed to Mt. Natagumo.

They had to reach as quickly as possible since Demon Slayer Corps members were dying every second. Arriving a moment earlier might save another life.

"We found it."

At Mt. Natagumo, Tanjiro leaped through the jungle, watching the mastermind manipulating Demon Slayer Corps members from a stone using spider silk.

It was an elegant woman, the nominal "Mother" of the Spider family.

When she saw Tanjiro, she panicked.

"Water Breathing, Fifth Form: Blessed Rain after the Drought."

A river appeared in Tanjiro's hands, gently moving toward the Mother. Cutting her neck with the Nichirin sword that can kill demons.

"Ding!"

Sparks flew, and Tanjiro's body was covered in goosebumps. A thread suddenly appeared in front of him, cutting his Nichirin sword like tofu.

If Tanjiro hadn't sidestepped at the last moment, he would have cut in half by now.

Rolling on the ground, Tanjiro held the broken Nichirin sword, cautiously watching the figure that appeared above the Mother's head.

"How can he fly in the air?... "

"No, he is stepping on the line."

Tanjiro stared at Wang Xu standing on the line, feeling a sense of danger, his pores expanding uncontrollably.

Was he one of the Twelve Demon Moons?

Tanjiro's palms were sweaty; he couldn't perceive how the opponent appeared.

"I'm sorry."

Seeing Wang Xu, the Mother knelt on the ground in panic.

She feared being killed.

Wang Xu was no different from the real Rui, using brutal means based on preference. The only difference might be the lack of Rui's twisted family bond obsession.

Wang Xu wasn't interested in playing house games; he kept these demons to capture humans for him, essentially acting as his subordinates.

Wang Xu didn't speak; his plum-red eyes merely glanced at Mother before his figure appeared on the ground.

This made Tanjiro take two steps back in wide-eyed astonishment.

Tanjiro only saw a residual image, and then Wang Xu appeared five meters away. The box containing Nezuko, placed on his shoulder, had disappeared.

Turning around, Wang Xu stood about five meters away. He intended to consume Nezuko.

His sixth sense told him that as long as he ate Nezuko, he would adapt to the sunlight, eliminating his weakness.

In this past year, he had already overcome the vulnerability of being decapitated by the Nichirin sword. Now sun was the only weakness he had.

This was the difference between Wang Xu and Tang An. The former had a sixth sense as a golden finger, allowing him to know that even if Nezuko hadn't adapted to sunlight, he could still adjust after consuming her.

Tang An, on the other hand, wanted Nezuko to fully adapt to sunlight first. He planned to first kill Muzan, and then consume Nezuko.

This was also why Tang An hadn't taken action yet—to ensure the plot would develop normally.

Because he didn't know if consuming Nezuko, who hadn't fully adapted to sunlight, would still allow him to withstand sunlight.

Without this certainty, he refrained from killing Tanjiro long ago.

*Snap!*

The box turned into fragments, revealing a long-haired girl with a cute face, wearing a pink kimono covered by a black outer robe. She bit a bamboo tube.

When she appeared, she instantly clawed at Wang Xu's neck and quickly retreated to stand beside Tanjiro.

She looked adorable but was clearly angry.

"Nezuko, are you okay?"

Tanjiro gripped his short sword, keeping his eyes fixed on Wang Xu.

Facing Tanjiro's inquiry, Nezuko shook her head. With hands whose nails emitted a cold gleam, she glared at Wang Xu with hostility.

She could also sense the formidable aura from the other side.

Behind the two, Mother remained kneeling. Without Wang Xu's command, she wouldn't stand up.