Sharing the cabin with Tsunade were Daimyo, two of his close assistants, and the three escort leaders Kohana, Razor, and Marui. Once the train began to move, smoothly and almost silently, Kohana took action without delay. She activated her sensory jutsu, standing quietly near one end of the car with her hands in a practiced seal.
Though she didn't possess the Eye of Kagura, a bloodline-based sensory technique with near-unlimited range as long as the user had chakra and clarity, her own technique was a specialized form taught within Kumogakure's ANBU. It didn't rely on conventional chakra detection alone. Instead, it forced subtle chakra reactions from any suppressed or cloaked sources within its radius, effectively disturbing hidden signatures and triggering feedback that could then be sensed.
This particular technique was developed under Ron's guidance. Thanks to its unique properties, it was even capable of detecting elusive threats like White Zetsu clones or hidden operatives, making it especially valuable during high-priority missions and diplomatic travel. The main reason Ron spread this technique is so that White Zetsus stays away; after all, they will know if they are discovered.
As the landscape outside began to blur and became dark with intermittent lights, Tsunade leaned back in her seat, intrigued not just by the technology but also by the hidden layers of advancement Kumogakure had cultivated, layers she was only now beginning to glimpse.
Of course, it wasn't only Tsunade on the train. Kurama and Katsuya Sage were also present, quietly observing, sensing, and trying to understand the new technology powering the vehicle they were traveling on.
Kurama, lounging off to the side, eventually spoke. "It's marvelous. The efficiency is incredible. As the train travels, it emits only faint chakra waves, barely noticeable, yet the seals on the path absorb and interact with them in harmony with the ones on the train. I was wondering how much chakra it would take to maintain miles of powered tracks, but now I understand; the energy is only required on the vehicle, not the rails. That's the genius of it."
He tapped a claw lightly against the floor. "These seals are self-sustaining. Every time the train is used, a minute portion of the chakra is absorbed to maintain the function of the track's seals. They're practically self-maintaining. Only if the track hasn't been used for a long time would a sealing specialist need to inspect it. Brilliant."
Then his tone shifted slightly as he looked at the passengers. "And about those two, Marui and Razor. Their chakra reserves are already comparable to most Shadow-level ninjas I've seen, though their quality hasn't quite caught up. What they lack is refinement and consolidation over time, or a breakthrough to achieve clarity of spirit. That inner transformation that raises one from a mere reservoir to a true master. It takes more than quantity; it takes quality also, which means having will and spiritual force behind your chakra."
Kurama paused, then glanced at the young Uzumaki girl.
"She's still young, but her chakra volume is impressive, almost rivaling those two, though still only at Jonin level. We've been moving through the black market, gathering information, and other villages also know those two, Marui with his Storm Release, and Razor with his mastery of Lightning Chakra Mode. They're young, your age, maybe, give or take. But do they have the monstrous talent like the contractors of the Three Great Holy Places? Like the Sannin?"
He scoffed at his own question.
After all, how could two elite Jonin possess chakra volume comparable to Orochimaru, who is now considered a shadow-level ninja? Orochimaru reached that level only after facing countless other shadow-level opponents and elite adversaries throughout his rise, much like the other two members of the Sannin. It's important to remember that we're not talking about the Orochimaru who once fought Hanzo alongside Jiraiya and Tsunade after just breaking through to Shadow level; we're talking about the current Orochimaru, seen when Tsunade left Konoha. Even then, among the three Sannin, he is known to have the smallest chakra reserves, and that's before he began extensively modifying his body in the future.
But still, how could two quasi-Shadow-level ninjas and even a Jonin from the Uzumaki Clan possibly rival Orochimaru's chakra volume? It was unheard of. While the Uzumaki and Senju clans were known for their vitality and chakra, their members were never naturally broken in the way Naruto and Hashirama were. Especially Naruto, despite being only a Genin, he had far more chakra than Kakashi, who was an elite Jonin at the time.
From the side, Katsuya finally spoke up.
"Tsunade-sama, I believe I've figured it out," she said. "Their bodies are at the peak of adolescence, like young shinobi transitioning into adulthood. It's a phase where rapid growth in both physical development and chakra volume is natural. But more importantly, their bodies show no signs of hidden injuries or internal flaws, so they are in a phase similar to growth at this age, which is unheard of, that is why despite not having any bloodline, just with their physical body and power of physical strength, these 2 ninjas at the peak of Jonin level or at quasi-shdow level has chakra volume similar to a actual Shadow level ninja."