Deep underground, somewhere in the Land of Water, was a futuristic biological laboratory.
Space twisted without warning, and Shun suddenly appeared inside the laboratory. He casually threw 10 White Zetsu into the pre-designed metal room.
Seeing Tsunade and Orochimaru, he vented his frustration, "I caught ten more White Zetsu. They appeared in the royal garden, less than a hundred meters from Manaka and Hamamaru's cradle. This is too dangerous. White Zetsu's infiltration ability is becoming more and more perfect. They can even infiltrate living people, transform into others' appearances, and copy their Chakra fluctuations."
Orochimaru's expression, uncharacteristically, became serious. "This level of disguise is enough to deceive most reconnaissance methods. It is a very effective infiltration tool."
Shun pressed his temples and said, "Currently, only my Mangekyo Ocular Technique: Divine Eye can detect them. But I can't keep my Mangekyo active all day. I must design a sustainable, large-scale detection method."
Upon hearing this, silence fell over the laboratory.
Tsunade thought for a moment, then said with some difficulty, "White Zetsu have Hashirama cells. If our people also transplant Hashirama cells, we could sense them but the mortality rate of injecting Hashirama cells remains high."
Orochimaru's eyes gleamed with knowledge. "White Zetsu's disguise and parasitism are essentially extremely clever Yang Release Chakra transformation techniques. However, Natural Energy is superior to Yang Release Chakra. So, whether it's sensing or forcibly expelling them, Natural Energy can be used to solve it. It's just that none of us can use Sage Mode."
Shun pointed at the White Zetsu in the container and said, "Can we extract White Zetsu's Chakra and incorporate it into a warning barrier? Like installing a specific 'White Zetsu Chakra' sensing switch for the warning barrier?"
Tsunade slammed her hand on the table. "That's right. We don't need to fully understand them, we just need to be able to identify them. Like the immune system identifying specific viruses, treat their unique Chakra signature as an antigen."
Orochimaru let out a low chuckle. "Hehehe... This approach is indeed feasible. And we have dozens of White Zetsu, that can be used for experiments."
Once the two determined the direction, their efficiency was astonishing. They quickly designed a brand new warning barrier solution.
A moment later, in the underground laboratory, the core of the new barrier was deployed.
Buzz—!! Buzz—!! Buzz—!!
A sharp, piercing, specific frequency alarm sounded instantly.
Clear red light lit up on the barrier wall, precisely marking the location and number of intruders.
The barrier squad leader reported excitedly, "It's a success. Your Excellency no longer needs to use his Ocular Technique, the barrier itself can now detect them."
Shun, Orochimaru, and Tsunade looked at the test results, and a hint of satisfaction finally appeared on their faces.
Shun stroked his chin and said, "The Land of Water is an island nation, made up of 12 islands. It's impossible to set up large-scale barriers everywhere. Can we design a smaller warning device with lower power consumption?"
Orochimaru's eyes gleamed with wisdom as he said, "Yes, by reducing the range and detection frequency, we can reduce Chakra consumption."
Upon hearing this, Shun nodded in satisfaction. "Your idea is excellent. Please come up with a feasible plan and prototype as soon as possible. We want to spread an invisible net of perception along the border, so these white ghosts can no longer infiltrate the Land of Water."
Orochimaru assessed the situation and said, "Give me three days, and I can build fifty devices."
Shun smiled slightly. "Then I'll trouble you."
...
Three days later, fifty "White Zetsu Sensors" were delivered to Shun.
He picked up a finished product to test, the warning range was reduced to ten kilometers. But with the Chakra amount of a Chunin, it could operate for an entire day.
Seeing this, he immediately summoned Minato.
Soon, the Yellow Flash, Minato, arrived at the palace.
Shun pointed to the white humanoid creature next to him and said, "I call these white creatures 'White Zetsu.' They possess extremely strong infiltration abilities, can parasitize and hide within living bodies, and can perfectly copy the host's vital signs and Chakra fluctuations."
Minato's expression became incredibly grim, and he immediately realized the seriousness of the problem.
"Parasitism and perfect copy. This means we might not be able to trust anyone around us."
Shun nodded, then picked up and activated a "White Zetsu Sensor." The device immediately emitted a piercing alarm, pointing to the White Zetsu's location.
He calmly stated, "This is the 'White Zetsu Sensor' developed by Tsunade and Orochimaru. It can sense the unique Chakra of White Zetsu and issue a warning. I need you to deliver them as quickly as possible to the border and the command centers of the main city's defense forces."
Minato immediately nodded. "I understand, Your Highness. I promise to deliver them as quickly as possible."
"Wait, Minato. Some of the strongholds or cities where you deliver the sensors may have already been infiltrated, and even some commanders or important personnel may have already been parasitized by White Zetsu."
Upon hearing this, Minato's heart sank, and a chill ran up his spine.
He asked gravely, "What should we do about those who have already been parasitized?"
Shun said without changing his expression, "Natural Energy is the only known power that can effectively suppress or even force out these parasites. And you are a contractor of Mount Myōboku, you can summon the toads of Mount Myōboku."
Minato instantly understood, his eyes sharpening. "Are you saying...?"
Shun nodded gently. "If you discover someone has been parasitized during your mission, I want you to summon the toads from Mount Myōboku. Use their Natural Energy to force the parasitic White Zetsu out of the body. Therefore, this mission can only be entrusted to you."
Minato took a deep breath and replied solemnly, "I understand, Your Excellency. I will proceed cautiously and will not betray your trust."
Shun took out a storage scroll and a document from his pocket, placing them steadily on the table.
"Good. Be careful with everything. The sensors and coordinates are all here."
Minato stepped forward and took the storage scroll and document with both hands. After a quick glance, he bowed respectfully and then suddenly vanished.