The forms in which Nen can persist generally fall into three categories.
The first is normal Nen aura, which is continuously released from the human body like an unending flow of life energy.
The second is the subconscious Nen imbued into works by geniuses and masters across various fields.
This type of Nen feels like the embodiment of craftsmanship—representing their ultimate mastery in their field, as well as an untainted, pure will.
As a result, this lingering aura attached to an object can last for a very long time.
The third is Post-Mortem Nen, which manifests like ghostly phosphorescence, lingering in the world after a person's death, fueled by intense negative emotions.
The source of this type of Nen is typically an unfulfilled obsession that cannot be resolved.
Because it is born from negative emotions, its threat level varies, ranging from mild to severe.
For Nen users, as long as they do not enter Zetsu, they can generally resist the influence of Post-Mortem Nen.
However, ordinary people who come into contact with it may suffer greatly—at worst, losing their lives, and at best, having their sanity stripped away.
This was Moro's understanding of the three forms of Nen persistence.
So when he heard that a virus was somehow linked to Post-Mortem Nen, he was inevitably taken aback.
Or rather, he found it difficult to imagine how the two could be connected at all.
Since arriving in this world, he had seen plenty of antiques and handcrafted artifacts imbued with Nen, but he had only encountered Post-Mortem Nen once—back on the airship.
"It's related to Post-Mortem Nen… in what way?"
Moro stepped over the corpses scattered across the floor and approached Sambika, lowering his gaze to the well-preserved coffin.
Inside lay a corpse that seemed artificially stitched together. Around it, wisps of black smoke-like aura swirled ominously, exuding an unsettling presence.
Sambika's brows were tightly furrowed as she stared into the coffin. In her signature soft tone, she explained:
"The virus… was 'created' by this Post-Mortem Nen."
"Huh?"
Moro was momentarily stunned.
As he observed the ominous aura, he asked in disbelief,
"Sambika, are you sure?"
"Yes."
She nodded lightly.
Moro was shocked.
Post-Mortem Nen was capable of this?
"So you're saying… as long as this Post-Mortem Nen remains, it will continuously produce the virus?"
Moro shifted his gaze from the black aura to Sambika.
She sighed, "Yes."
Moro found this absolutely absurd.
Then again, he recalled the rare instances of Post-Mortem Nen in the original story.
Even something as irrational as Million Lives Cat, which could resurrect people using a Post-Mortem Nen mechanism, existed.
So, a lingering Nen that endlessly generated viruses… wasn't actually that far-fetched.
Nen, after all, was completely illogical.
Not even death could restrict its bizarre nature.
Sambika looked worried. "With the research data on 'OG' and my Nen ability, I should be able to develop an antiviral serum within a day. But if we don't purify the Post-Mortem Nen at its source… the virus will just keep spreading."
Moro's eyes flickered at her words, but he remained silent.
Sambika didn't notice his reaction. She kept staring at the black Nen in the coffin, brows furrowed, and muttered,
"My master is an Exorcist, but her ability doesn't work on Post-Mortem Nen. However…"
Suddenly, she seemed to realize something, and her concern faded significantly.
"I can ask my master if she knows any Exorcists who specialize in purifying Post-Mortem Nen!"
"Sambika."
"Hm?"
She turned to look at Moro.
He reminded her,
"The Post-Mortem Nen issue can wait—treat the villagers first."
"Ah, right."
She nodded firmly. Without hesitation, she bent down and reached into the coffin, pressing her hand onto the corpse—right through the ominous black aura.
Moro was startled by her sudden action.
He was about to stop her, but then he noticed that the Post-Mortem Nen did not react aggressively.
"Its core function is virus creation, huh…?"
Moro observed the unresponsive black aura, deep in thought.
Even though Post-Mortem Nen was inherently irrational, it still seemed to follow some kind of internal logic.
While he was contemplating, Sambika withdrew her hand.
Her once smooth, jade-like hand, with visible veins beneath the skin, had now shriveled—the skin withering like aged tree bark.
Clearly, she had been infected by the virus. But what shocked Moro was how quickly it had taken effect.
His eyes filled with surprise.
Sambika raised her now-aged right hand and explained softly,
"My Nen ability actively 'transfers' the virus into my body, forcing it into its active stage immediately…"
"Stop. I don't need to know."
Moro swiftly cut her off.
No one willingly revealed the details of their Nen ability.
Of course, Sambika understood this as well.
She looked at Moro and said, "It's fine. My ability only affects viruses. I can use my body to analyze their weaknesses and create the perfect cure."
Moro glanced at her deteriorating hand and said,
"That sounds extremely risky."
"Yes. If I fail to analyze the virus within the 'time limit,' I will die."
Sambika spoke about death with complete indifference.
This had nothing to do with Nen—it was simply the mindset of a Virus Hunter.
Moro suddenly felt deep respect for her. He couldn't help but say,
"Do you really have to take such a big risk? You have extensive medical knowledge—you could just use Nen as a supporting tool."
"I believe it's necessary."
She continued in a calm tone,
"My master is an Exorcist. When Exorcists remove a curse, they inevitably have to bear some of its risks themselves… My ability was influenced by her philosophy. She constantly sighs about it."
Sambika gazed at her withered hand and murmured,
"But I know one thing for sure—fighting viruses is a race against time. That's why I'm grateful for this ability. Also, analyzing viruses is different from Exorcism. The more I understand a virus, the lower the risk of my analysis."
"…"
Moro was speechless.
Aside from admiration, he had no other thoughts.
This was the embodiment of self-sacrifice.
With the help of her Nen ability and the research data, Sambika quickly developed an antiviral serum.
In just half a day, the villagers—who had been suffering from the virus—gradually recovered, escaping from the brink of death.
Meanwhile, Hisoka, utterly bored, had wandered off somewhere.
Inside the underground research lab, Moro turned to the two surviving researchers he had deliberately spared.
"As I promised, I won't harm you before you leave, nor will I chase after you. You're free to go now."
The two exchanged a quick glance before bolting for the exit like desperate men given a second chance at life.
Moro, however, casually pulled out his phone and confirmed some details with Argo.
A few minutes later, he lifted his other hand and released two coin-sized flying stars.
Whoosh—whoosh—
The stars darted through the corridors, ascended the stairs, and—just as the two men reached the courtyard—struck them dead on the spot.
A muffled thud echoed as they collapsed.
Back inside the underground lab, Moro put down his phone and returned to the coffin.
"Wheel of Time… can it absorb Post-Mortem Nen?"
He pondered silently.
At the same time, Sambika dialed her master's number.
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