Reborn in Naruto As Madara's Grandson

A/N:- Since, I have added the 'Sin Seal', I will write it's Origin story. Some people liked the Idea and some don't. But anyway I will write a full origin story of the Seal. Expect More OC character to pop out and add flavor to the story. Whether it is salty or sweet is for you to decide. Comment your thought down below, but I won't change the idea. Though I will appreciate some wonderful suggestions. Enjoy your read.

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The Grimoire eats up all the 'Adamantine Chains' to reveal a black color box with many symbols and seals on it.

The 'Sin Seal' on my hand starts to pull me towards the Box. The hidden chains of the Grimoire appears. These chains start to bind the box and pull it towards the grimoire.

The chains stretch the box and start to reshape it. The box is reshaped in the form of an hourglass. An eye opens in the middle of the hourglass as it stares deeply into my soul.

The chains start to pull the hourglass seal towards the grimoire and fuses with it.

Various strange runes crawl out from the grimoire and creeps in Izuna's left eye. His left eye turns into Mangekyo Sharingan and absorbs these runes.

Aah…

Izuna's vision blurs as intense pain assaulted him. Lots of unknown information is forcefully injected in Izuna's mind. The strain from information over-load causes his vision to turn blurry and his head spins.

His consciousness fades as he slumps down on the ground. The chains connected to Grimoire rattle and blue energy channels through them.

'Freedom'… Freedom from constraints of time.

These words echoed in Izuna's ears before he lost consciousness. His body rises from the ground and passes through the roof as he floats on top of the large Uzumaki seal.

A large pillar of blue energy rises from the Grimoire. The large pillar of light shoots in the sky and pierces through it. It passes through a spatial opening in the sky and disappears.

The Grimoire closes and the new seal attaches itself into one of the left slots on the Grimoire. Another five slots are still empty. The Grimoire disappears and various totems and runes on Izuna's body retract.

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In the vast void,

A blue beam of energy travels through the plane while drilling a hole through some sort of barrier as it enters inside a dimension. The beam enters inside the dimension and travels towards a massive pillar of unknown size and strikes it. The pillar lights up in blue light and various chains appear around the pillar.

Inside a castle somewhere in the dimension, a cloaked figure sits on a large throne with his hands cupped under his chin. He seems to contemplate some issues while looking in a certain direction.

"The war has been waged for almost a century. We have lost a lot in this war, our power has declined a lot during this time. We can't allow those damn parasites to win and take hold of our homeworld. We will struggle to the bitter end and will drag them down with us."

The cloaked man smashes his hand on the armrest of the throne. The throne is crushed from the impact of his attack. The entire castle shakes and collapse. Ignoring all of this commotion, the cloaked man looks intently at a ring in his hand.

The ring in his hand is shining brightly with blue light.

"It has appeared. It has finally appeared. Summon -x-x-x-x-."

The cloaked figure bellows loudly. A short while later another purple-cloaked man appears in front of the person sitting on the throne.

"It has finally reappeared. The 'Grimoire of Sin' has finally appeared once again. I can feel its presence. You are the most suitable candidate to retrieve it back.

Eighty years ago, in that deadly fight, we lost our most powerful warrior, and we lost the most prized possession of our race in spatial fractures. We could not sense the presence of the Grimoire until now."

The cloaked man clutches the ring in his right finger tightly.

"I have detected the presence of 'Grimoire of Sin' in one of the lower dimensions. Your task is to retrieve the 'Grimoire' back to our clan at any cost.

With the help of the Grimoire, we can easily turn the tides of war and score a victory against those parasites. Now, return to clan only when you have successfully completed the mission. Failure isn't an option in this mission."

"Yes, my lord. I won't disappoint you."

The purple cloaked man bows and salute in one of his knees as he reassures the cloaked man.

He stands up and disappears from the ruined castle. The cloaked man returns to contemplation as the castle returns to its previous form.

'We have a chance now. By utilizing the power of this artifact, we can repel the enemy forces once again. We weren't the only ones who lost their powerful warrior in the previous battle. It was an equal exchange and with the 'Grimoire' back in our hand, we will have an edge against those parasites. I despise their existence from the very core of my existence.'

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The purple cloaked man leaves the castle and arrives before the large pillar present in the middle of the dimension. There is a large spatial rift above the pillar. Violent space turbulences occur inside the spatial rift.

The Purple cloaked man touches the large pillar and tries to sense the remains of energy from the large pillar.

"Found you."

The purple cloaked man floats in the air and reaches the entrance of the spatial rift. He touches the rift with his bare hand but gets repelled by the space turbulences inside the rift.

"Those damn traitors, using the sealing formula of clan against the clan. If I get my hands on them, I will tear them apart in a million pieces. Thankfully, this sealing formula can't restrain me."

The purple cloaked man stretches out his hand. A strange seal appears on his left hand. The seal glows and coat the body of the cloaked man in cyan-colored energy cloak.

The cloaked man reaches near the barrier and touches it. His hand passes through the barrier, following which he easily crosses across the barrier.

"Now, time to retrieve the Grimoire. I can't delay any further for the sake of the clan."

The cloaked man travels through the void. His destination 'The Shinobi World'.

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Argh…

'My head hurts like hell.'

Izuna wakes up and clutches his head tightly. Slowly, as the pain subsides, he looks around. He is present inside a completely white space.

'So, I am inside my mindscape.'

Izuna stands up and walks towards the center of his mindscape. He notices many new floating orbs beside the ten original Orbs.

A cyan orb, a light grey orb, a dark grey orb, a dark yellow orb, a dark green orb, and a pale yellow orb floats in the air.

One by one, Izuna inspects them and concludes about their nature.

'So they are Radiation release, Shock Release, Storm Release, Swift Release, Wood Release, and Black Lightning respectively.

Then what new powers have I gained again to abruptly enter my mindscape after that second seal. Izuna inspects the room closely to search for any changes.

After a while of inspection, he notices a large blue blackhole hovering near the Space blackhole. He tries to urge the black hole to move towards him. But the blackhole doesn't budge from its position.

Giving up on his futile attempts, Izuna walks towards the blue blackhole to inspect it closely. He tries to touch the blackhole but is violently repelled by the blackhole.

His Mangekyo Sharingan activates on it's own, and the ability of his left eye activates.

Everything slows down for him. His body is suspended in mid-air as he stares at the blue blackhole.

'I see. This makes sense.'

Izuna deactivates his Mangekyo Sharingan and sits down in his mindscape and compiles the recent information which popped up in his brain.

An unknown amount of time passed. Izuna opens his eyes, his Mangekyo Sharingan activates on its own.

"I have gained a lot from this trip. It's time to return to Konoha. Thankfully, I can just teleport to the village by using 'The Flying Thunder God Jutsu'. My understanding of space-time increased a lot during this trip and I can reach the next level of Fuinjutsu at any time.

I have to test my new abilities. The Nine-tails attack will happen soon in the future. That will be the perfect opportunity to test my powers."

Izuna teleports to the outskirts of Konoha, near the Uzumaki Shrine. He had already collected the 'Oni-Masks' from the Uzumaki seal.

'Let me return one of the masks to the Shrine.'

Izuna appears on the outskirts of Konoha. He is welcomed by a large Tailed beast bomb right in front of him.

"Nani?"

Wasting no moment, Izuna immediately activates his Mangekyo Sharingan.