As mentioned before, due to the lack of systematic academic inheritance in the ninja world, a very bizarre phenomenon has emerged.
Discovering "new" techniques relies entirely on "Archaeology."
The method of hacking Madara's Rinnegan fell under "Archaeology."
And now, after several days of exploration, the theoretical method for treating special terminal illnesses has also been derived from digging up the past.
Based on the ancient stories told by Makoto and Black Zetsu, there are two specific instances involving "God-Tier Treatment."
1. The Sage's Tags.
The Sage of Six Paths, Hagoromo Otsutsuki, once pierced his younger brother Hamura through the chest with a Chidori to dispel Kaguya's control.
When his brother was on the verge of death, he took out a Sage Tags given to him by Gamamaru and successfully saved Hamura, instantly restoring him to perfect health.
Orochimaru went to Ryuchi Cave to inquire about this item.
It is indeed a "Rare Item," containing pure and vast Natural Energy.
It was likely created before the arrival of the Otsutsuki clan, back when Chakra hadn't yet polluted the world.
And it's highly probable that it's already Out of Print, with only that one copy existing in history.
Otherwise, it would be utterly heartless not to give one to Jiraiya when he died.
Even if not for Jiraiya, why not give Naruto and Sasuke a few Sage Tags when the Otsutsuki clan invaded later, to use as Naruto-style "Senzu Beans"?
With this thing, would Sasuke still need to be constantly drained of chakra?
So, the Sage Tags is definitely no longer available.
2. Six Paths Yang Power.
However, Orochimaru can speculate about the principle behind the Tags.
After all, they have Makoto here, who is a purer master of Natural Energy than the Three Great Sage Regions combined.
Aside from restoration through Natural Energy, there's also the later restoration via the [Six Paths — Yang Power].
The Sage of Six Paths just had to touch a butt, and the back would be healed.
During the Fourth Great Ninja War, he temporarily granted Naruto the ability to use it.
After Might Guy opened the Eighth Gate of Death, his entire body was charred ash, his heart was fading, and he was seconds away from crumbling into dust.
Yet, Naruto kicked the Grim Reaper in the face and saved him.
If Naruto hadn't been in a hurry to fight Madara and had made a new foot for Guy—like he made a new eyeball for Kakashi—Guy wouldn't have spent the rest of his life in a wheelchair.
The fact that someone completely charred could be saved and fully restored—what does that mean?
In Makoto's previous life, there was a pesticide famously said to "give you time for regret, but no chance to survive."
Its effect was equivalent to turning your organs into Hard-Boiled Eggs—fibrotic, hardened, and completely irreversible.
But the Six Paths Yang Power is different—it can genuinely reverse a hard-boiled egg back into a raw, runny egg.
So where does this power come from? From Kaguya?
Essentially, it comes from the Chakra Fruit.
If you think about it this way, the restorative power of Six Paths Yang and the recovery from Sage Tags actually share the same origin—both are essentially recovery opportunities granted by The Planet Itself that nurtured all life.
Therefore, Orochimaru and Tobirama wanted to find Makoto to explore how to convert Natural Energy into Life Energy.
Coincidentally, at this very moment, Tsunade sent a message—she had discovered her "evolved" special ability.
...
In the Laboratory.
Tsunade arrived in Amegakure.
She had handed over her duties to Shizune and Hiruzen, then slipped away.
Tsunade took out the Natural Energy Stone Makoto gave her.
She had made it into a necklace.
As for her original pendant worth several mountains—the First Hokage's Crystal Necklace?
She casually stuffed it into a drawer in the Hokage's desk.
Wearing two heavy necklaces at once was uncomfortable and tacky!
Just like Hikari's pendant, Tsunade's stone provided specific enhancements targeting the Yin Seal and Strength of a Hundred Technique.
"Hah!"
Tsunade activated the Strength of a Hundred Seal.
Golden patterns spread across her entire body. This gold wasn't simply yellow—it was the color of Sunlight.
When Tsunade took a deep breath and restrained the overflow, the gold on her body faintly shimmered with flowing colors, as if turning Rainbow-colored.
After all, sunlight inherently contains the full spectrum.
"I haven't fully mastered it yet. Let me treat these two first; we can talk after they're healed."
Tsunade walked over to Kimimaro and Ameyuri Ringo, placing one glowing hand on each of them.
'Hum.'
A surge of power emerged.
Green grass and vibrant red flowers suddenly sprouted from the cold laboratory tiles beneath their feet.
"This... this is pure Life Energy."
"Hmm."
Orochimaru and Tobirama exchanged glances.
With their discerning eyes, they naturally wouldn't mistake this for Hashirama's Wood Release.
This was the raw essence of Life itself causing the environment to flourish.
"Alright, that should be enough."
Tsunade withdrew her hands.
The next second, she deactivated the seal.
The stone returned to hanging dormant around her neck, and she returned to her normal state.
It was clear she wasn't lying—she truly hadn't fully mastered it yet.
Deactivating immediately after treatment wasn't a choice, it was a necessity to prevent overload.
Meanwhile, Kimimaro and Ameyuri looked at their hands, stunned.
The pain, the weakness, the feeling of death... it was all gone.
"I want to know... how long can I live now?"
After completing the treatment, Tsunade didn't celebrate.
She walked directly up to Makoto and asked with complex emotions.
"What do you mean?"
Just as Ameyuri Ringo was rejoicing over her recovery, she frowned upon hearing Tsunade's grave tone.
"Does this treatment consume the caster's lifespan? If so..."
"Tsunade, you...?" Tobirama also furrowed his brow.
"Correct. Your assumptions are right. This technique is essentially Life Bestowal and creates an equivalent exchange by consuming the user's lifespan."
"But that's not what I meant by asking the question."
After confirming the horrifying cost, Tsunade turned her gaze back to Makoto.
She needed him to verify her hypothesis.
She had originally thought that Makoto giving her this stone merely meant transitioning from relying on the Yin Seal to maintain her appearance to truly rejuvenating.
But recently, she discovered something terrifying.
As a Medical Ninja who had previously researched Creation Rebirth (which accelerates cell division at the cost of lifespan), she reexamined her own cells after using the Stone.
No matter how much lifespan she consumed, as long as she was connected to the Stone... it replenished entirely.
Later, she uncovered the ability to transfer life energy to others.
Indeed, it required expending her own life and lifespan—but what if her life and lifespan were Infinite?
"Hmm... from your description, I think I roughly understand."
Makoto observed Tsunade, recalling the visual form of her Strength of a Hundred earlier.
The intricate glowing patterns matched the "X" symbol perfectly.
Moreover, when people saw Tsunade, many thought of "Deer".
It made perfect sense.
Xerneas.
The Life Pokémon.
Tsunade had become the Avatar of Life itself.
She could grant eternal life because she was a renewable energy source!