Naruto: Fourth Hokage Orochimaru

"Uff..." I sighed "exhaustedly" as I spat the snakes from the palm of my hand.

Despite summoning hundreds of snakes, I only managed to create 65 explosive snakes after spending a thousand chakra points.

"Even though my chakra regeneration speed increased after devouring Hashirama's cells, it will still take me at least an hour to recover the chakra I lost."

Each snake has the power of three explosive tags, and considering that each tag requires five chakra points, that's all I can create for now if I don't want to risk completely depleting my reserves.

So for now, I'm still far from creating a kamikaze snake army, but I will try to create as many as possible before a battle.

I dispelled the Summoning Jutsu, and the snakes returned to Ryuchi Cave, although I was tempted to leave them in the storage space to summon them almost without wasting chakra or performing hand seals.

In the long term, it might be more inconvenient than beneficial since the snakes cannot grow or improve in the storage space as they usually would, but I will keep that card for the future.

"Now what I need is a hidden trump card to help me deal with high-ranking enemies, aside from the Summoning Jutsu, I only have Mokuton, some forbidden jutsus, Kenjutsu, and Fuinjutsu."

As we all know, it's impossible to kill even a fly with a fireball, so unless it's a Rasengan or something similar, there's no need to create new elemental jutsus.

However, I'm very interested in Kenjutsu and Fuinjutsu, in the ninja world there are few examples of such a combination, some of them are the weapons used by the Seven Swordsmen of the Mist and the Kusanagi swords, though this is just a theory.

"Kusanagi!" I exclaimed, recalling the sword I picked up from the experimental base.

I quickly took out the sword and observed it, although it's not the Kusanagi sword used by Orochimaru in the anime and has no special abilities, it's made of the same material as the Kusanagi, this sword was found by the original Orochimaru in some ruins in the Uzumaki kingdom.

Without hesitation, I used Predator and devoured the sword. "Great Sage, analyze."

[ Analyzing... analysis complete ]

[ Results: [Short Sword] [Unknown Metal] obtained ]

"An unknown metal?" I asked, confused.

[ Affirmative, insufficient information to name it, you can name it yourself if you prefer ]

"Tell me its characteristics first."

[ It's a chakra metal with high conductivity, it is also extremely impact-resistant ]

"Highly conductive, impact-resistant..., just call it Chakratium!" I said while holding my chin, I know, very original.

[ Name assigned: Chakratium ]

"Great Sage, create a new sword using this mineral," I said, forming a mental image of what I wanted.

[ Producing sword... sword completed ]

Instantly, a straight sword in its sheath appeared in my hand, I slightly unsheathed the blade, which was entirely black with a metallic shine on its edge.

That's right, this is the same sword Sasuke will use in the future, but from today on, it's no longer the same sword, and certainly not Sasuke's anymore.

I observed the sword closely, turning it slightly under the light to appreciate its dark metallic sheen. "Perfect!" I say to myself.

"Great Sage, can this sword channel chakra and withstand sealing techniques, right?" I asked, placing a finger on the blade and injecting a small amount of chakra.

[ Affirmative, Chakratium has almost perfect conductivity, it can withstand fire, lightning, wind, and even elemental combination techniques, sealing techniques are also not a problem ]

"Good then." I smiled, satisfied with the response as I swung the sword, with a simple motion, the air around it split, producing a sharp whistle.

I hung the sword at my waist and sat cross-legged on the ground, focusing on my storage space, I retrieved several scrolls and books about seals.

These are materials I obtained before blowing up the base along with the root Anbu, I grabbed a book where I had made several notes about my discoveries and began flipping through its pages slowly.

There are visual representations of several seals like the Eight Trigrams Seal, a Paralysis Seal, a Chakra Extraction Seal, an Explosive Seal, and even the Caged Bird Seal.

There are many more seals than these since, as Konoha's sealing master, I have full access to the village's seal library.

"The Paralysis Seal works by invading the target's chakra system, it's possible to isolate the seal by cutting off chakra flow to the affected area, but that's not so easy if the affected area is the head, in that case, you're basically done for." I stroked my chin, analyzing the seal.

"This seal has great potential, but its limitations are too obvious..."

The Chakra Extraction Seal operates similarly but focuses on taking the target's chakra, storing it, or dispersing it to exhaust the enemy.

"Caged Bird Seal..." my gaze fixed on the distinctive seal of the Hyuga clan.

The Caged Bird Seal is used by the Hyuga clan to protect the Byakugan and maintain control over the branch family.

The main branch of the Hyuga clan can use the seal to remotely cause pain to the branch family, but not just that, they can also destroy blood vessels or organs like the eyes.

But this doesn't mean the seal can only be used for that, with a simple modification, you could even destroy the brain or the heart.

The invasion method of the Caged Bird works through chakra but also affects the nerves and blood vessels, something akin to poison, though it can't be neutralized unless you're a seal master, even among Fuinjutsu masters, dealing with the Caged Bird is a major challenge.

"Perfect," I murmured, running my fingers over the seal's representation, though morally questionable, I couldn't deny it's a masterpiece of Fuinjutsu.

"If I can modify it, this seal could be the basis for an ultimate technique!" I exclaimed excitedly.

The seal could be adjusted to directly attack the nervous system instead of just the blood vessels, or even create a reaction that blocks the brain's electrical impulses.

This would leave the target completely defenseless, but the best approach would be to use all possible invasion methods since the enemy wouldn't let me perform brain surgery calmly.

I took up the brush and sealing ink again and began modifying the seal, the most important thing is the method of invasion, since I want to combine Kenjutsu with Fuinjutsu, it must be through cuts, so once cut, death is certain.

Modifying the Caged Bird isn't difficult since it meets all the criteria for what I have in mind, after racking my brain for a while, I withdrew my hand and observed my creation.

At the center is the symbol of the Reaper surrounded by a circle of small tadpoles, I slightly modified the design to illustrate my intent.

"This isn't enough, although it works, I want to add more functions, the point is to damage the enemy as much as possible, even if they don't die!" I said, taking the brush and writing once again.

"I did it!" I celebrated excitedly, holding the sword in my hand while continuously injecting chakra.

The blade of the sword is covered in strange symbols resembling tadpoles and various abstract shapes, when I withdrew the chakra, the symbols quickly retreated, never to be seen on the sword again.

"Kuchiyose: Giant Snake!" Instantly, a giant snake 20 meters long and 5 meters wide appeared with a puff of smoke.

The giant snake tilted its head dumbly, not knowing why I summoned it, but I didn't give it time to think and quickly injected chakra into the sword, a cold sensation ran through the snake.

With a hum, a small cut appeared on the giant snake that paralyzed it, and in an instant, hundreds of tadpole-like symbols spread, covering its entire body, with a dry sound, the snake fell to the ground, with blood seeping from its orifices.

When I moved far enough away, I formed the release seal, which caused a massive explosion, the blast left a ringing in my ears as the smoke slowly dissipated, revealing a smoldering crater.

Despite the impact, a smile formed on my lips as I looked at the sword, after the modification, the sword has the following functions.

When the sword cuts the skin, the cursed marks begin to spread throughout the body, starting from the cut and extending until they finally reach the brain and heart.

While the cursed marks spread through the target's body, the seal causes paralysis and directly affects the chakra flow of the cardiovascular system, it is ideal for enemies with great physical or regenerative resistance, as it attacks the vital core of their body.

It also targets the nervous system and brain chakra flow, this can cause immediate paralysis, confusion, memory loss, or even brain death, depending on the amount of chakra injected, it is perfect against genjutsu users or shinobi with high mental control, but it doesn't end there.

While all this is happening, the seal extracts the target's chakra and begins storing it, if I decide to release the stored chakra, it can cause the same effect as an explosive tag directly inside the target's body.

If the cursed marks have already covered the body entirely, then nothing will remain of the target except a gruesome bloodbath, I can also use the stolen chakra to keep the seal active indefinitely, like a parasite.

Additionally, Medical Jutsu cannot remove the cursed marks, only a sealing master could do something if they act in time.

"From today, your name will be Murasame," I said, baptizing my sword, without realizing it, the sword glowed for an instant.

Fortunately, my inspiration to create the sword was greatly influenced by the Caged Bird, why do I say that?

Well, as I said, the main branch of the Hyuga clan uses the Caged Bird to discipline the branch family, so, if they have a seal so dangerous that it's almost like a double-edged sword, why hasn't anyone used the same method to destroy all the Hyuga at the same time?

The answer is simple, this seal can only be activated by the main branch because it is designed to recognize the genetic code in the chakra of the main branch.

Just as Asura and Indra's chakra exists, all ninjas have a hereditary chakra signature, although it may differ in each generation, the original signature remains, if you combine it with a method exclusively designed for this purpose, you don't have to worry about outsiders activating the Caged Bird.

This means that first, the sword cannot be used by the enemy, and second, the cursed seal does not work on me.

I didn't do this out of fear of cutting myself by accident since for the seal to activate, it is necessary to inject chakra into the sword, but rather out of loyalty, I don't want to die because my sword decided to betray me for someone sexier like what happened to a certain shark hybrid.

"It's time to go back, it's a shame I couldn't keep practicing my wood style, but unless I have Sage Mode, I can't do anything that makes a qualitative change, besides, the wood style jutsus I got from Danzo are already exhausted," I murmured with a frown.

"Maybe I can talk to Hiruzen to request the secret jutsus written in the forbidden scroll, even if I can only obtain the ones related to Mokuton," it would obviously be tempting to have access to more forbidden jutsus, anyway, let's talk about that after signing the peace treaty.

The sky had already darkened and the moon majestically illuminated the starry sky, the figure of a certain bunny girl appeared in my mind.

"Just wait for me!" I said, clenching my fist with my hand extended toward the sky, as if I could hold her in the palm of my hand.

After a while, I decided to return to the village, tomorrow at first light we will march toward the border.