Ninja Ice House

What it is is secondary; the key issue is that this thing is difficult to control. If the movement is too large, it will involuntarily overflow.

"Is this a phantom limb? How does it feel?"

Gone was the initial surprise. After watching for a while, Usami curiously stepped forward and touched it. It didn't seem to be fake, but rather had a tactile feel. The feathers on the edges even seemed a bit sharp, and with the slightest vibration, it made a crisp sound like metal colliding.

"It seems... not to be a physical organ or limb, but something rooted in the spirit and soul, like... originally just a cocoon, now beginning the process of breaking free and becoming a butterfly..."

Upon hearing this, Karin's relaxed face instantly tensed up.

"Cocoon, who is the cocoon, and who is the pupa?"

"Uh?"

Usami, who hadn't thought much about it at first, suddenly started racking her brains, quickly considering many possibilities before her smile faded.

"Could it be that..."

Karin nodded almost imperceptibly, then looked at Kurama Yakumo, whose expression remained unchanged.

"what do you say?"

"I can't give a definite answer right now, but... this is my chance, even though it's also dangerous."

"I have to tell you very clearly that, according to you, this thing is very likely not a disease, but rather the activation of recessive genetic information that was already hidden in your body."

"Isn't this a description of bloodline limits, like the Sharingan?"

Usami pressed on with some disbelief.

Many types of bloodline limits in the ninja world are not activated at birth. Perhaps the body is too weak, the mental strength is insufficient to bear them, or the stimulation after birth is not enough.

In short, recessive genetic information is not guaranteed to be activated.

"Embedding its own core genetic code within a population, spreading in a recessive manner, and being reborn across time and space at the right time..."

"This is... a wedge?"

"There are many things with similar effects, such as chakra reincarnation, which is an incomplete method."

Karin pondered for a moment before answering.

"In general, highly intelligent life forms do not typically adopt this method of embedded concealment and resurgence at opportune moments. In nature, viruses are more common. The genetic information in our bodies undergoes wear and tear or mutation with each generation. Theoretically, it should become shorter and more disordered over time. However, in reality, no organism has ever become genetically extinct due to long-term inheritance. Ultimately, this is because humans are infected with many bacteria and viruses throughout their lives, and these have a very small probability of mixing into human genetic information and being passed down from generation to generation..."

Although the probability is small and the vast majority are malignant mutations, the sheer number and frequency of these mutations can accumulate to form some high-quality benign mutations.

Of course, this is just an idealized description; the actual situation is a million times more complex.

Because bacteria and viruses have very little genetic information, possibly only a short segment of nucleic acid chain, while the genetic information of higher intelligent life is very difficult to hide successfully in another organism.

Unless, of course, the organism's genetic information encoding method is extremely advanced, jumping directly from binary and decimal to decimal or even hexadecimal, and the expression method is also much richer.

The difference between these two is not necessarily smaller than the difference between carbon-based life forms and silicon-based life forms.

"This...is too difficult!"

Even without much relevant knowledge, Usami is quite intelligent, and the dialogue between Karin and Yakumo Kurama is vivid and detailed, so she can understand it in general.

Karin replied with a frown:

"If this were a normal material world, the probability of this happening would be even smaller than the chance of the ninja world being irradiated by a neutron beam explosion and instantly heated into a pot of magma soup. But... with chakra and natural energy, it's hard to say."

"Then...wouldn't that be very dangerous?"

Usami's worries became increasingly apparent.

My comrade-in-arms of many years is very likely to be "opened up," which means he's going to die.

Or perhaps a dramatic change occurs from the inside out, and then, imperceptibly, one is replaced by another person, or... transformed into a strange monster?

"Don't worry, Usami, have faith in me. Although I was initially taken aback by this turn of events, after calming down, I realized that this was a great experience and opportunity. Although I am still very strong, my physical condition is too poor, which hinders my combat ability and has gradually made me a 'helper' and a burden to you."

"That's not true..."

Before Usami could finish speaking, Kurama Yakumo interrupted, saying:

"If I were content to be a second-line 'assistant,' I wouldn't have been so determined to go to ninja school and become a proper ninja."

Too strong-willed is a true reflection of Yakumo Kurama; gentle on the outside but tough on the inside is the assessment of almost everyone who knows Yakumo Kurama.

After pondering a plan for a moment, Karin calmly asked:

"How far have we progressed? How confident are you?"

"It's said to be dangerous, but it doesn't actually feel particularly difficult. You know, Karin, Usami, back then, Lord Commander implanted a Sharingan in me to control my rampaging mental energy, and later he also planted the 'Karma'. Although it hadn't thawed yet, I even doubted whether my body and adaptability could survive until the initial thaw of the 'Karma'. I thought the hope was slim, but now..."

As he spoke, Kurama Yakumo removed the colored contact lenses he had been wearing, revealing his mutated Sharingan, which had not been seen by anyone for a long time. The original appearance was nowhere to be seen; in its place were eyes with several ring-shaped red stripes, but not as dense as the Rinnegan. The base color was gold, and a jet-black stripe extended rapidly from the corner of the eye to the cheek and ear.

"It's thawed? And its eyes have mutated too..."

"Right! Although the spiritual power within my body is still roaring, whenever I feel uneasy, the slight power leaked from these eyes and the 'wedge' allows me to easily resist the waves of invasion spreading from the depths of my dark soul."

As he spoke, Kurama Yakumo chuckled lightly.

"It is precisely because I realized how ancient and powerful the 'monster' within me was that I truly understood how extraordinary the Sharingan's potential was, and how terrifying your father, Kosugi Shōdō's, real strength was. Even when facing the Fifth Hokage, the Fourth Hokage, and Jiraiya-senpai, I never felt this… so insignificant, like a tiny ant gazing at the stars, overwhelmed by the vast universe…"

"Alright, we'll go along with your suggestion for now and wait and see. What are you planning to do?"

"It would be best... to tame it into a family bloodline spirit beast..."