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Author's Disclaimer: Guys I took a look at other demon slayer fanfics as you instructed me to learn about other breaths, the issue is that they are very unbalanced or very ops and have a lot of unnecessary hits.

Conclusion: The author will not use.

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Hizashi advanced along with his companions towards Yui ready to attack with everything they had.

He had already received the information that she was an Uchiha and instructed the other attackers who might find out not to say anything about it so it wasn't a surprise when he saw the two red eyes swirling beneath Yui's mask, however something else scared.

" She is smiling?" He saw Yui's face with a big evil smile, as if he had found a new toy and wanted to test his limits, at that moment Hizashi immediately stopped his offensive and tried to stop his brothers who kept advancing.

"Stop!" He yelled but it was too late, "kekkijutsu! Rashin!" Yui exclaimed as she stomped on the ground causing it to crack and in the next moment a snowflake formation appeared over her feet and glowed brightly.

CRACK!

The ground under her feet broke into cracks and Yui clenched her fists before striking the air in front of her, the air bending at the will of her strength and advancing her towards one of the Hyuuga who immediately tried to form a base for her. defend yourself but....

"How do you fight the air?" That was his last thought before her body exploded and split into 5 different parts sending blood everywhere, "DAM!" Another hyuuga yelled and advanced towards Yui as a tetragrammaton formed at her feet overlapping Yui's.

"Eight Trigrams Revolving Palms of Heaven!" The hyuuga screamed and immediately started his attack against Yui who changed her posture a little and two water bubbles formed around her hands, "Adapted water breathing...." She muttered and defended herself from this hyuuga's blows.

"Fist of the Water God!" Yui said softly and leaving a trail of water in the air looking like small waterfalls Yui's hands moved and collided with this hyuuga's gentle fist technique.

BAM!BAM!BAM!

The air twisted in that moment when dozens of blows were exchanged in a single moment and the next thing Hizashi noticed was his brother spitting blood with his arms ripped apart and with one of Yui's hands protruding from his chest.

"Pathetic." Yui said and ripped his hand from the hyuuga's chest letting his corpse fall hard to the ground, Hizashi gritted his teeth at Yui's words and the veins in his face bulged as he got into position and a single thought crossed his mind.

"I have to kill her right here and now!" Hizashi mentally screamed as he saw his fellow veterans of wars and countless battles falling in mere 3 seconds for a little girl who as far as he understood is self-taught in the matter of hand to hand fighting.

Yui didn't say anything and just got into position again while taking a deep breath and getting used to her new way of fighting, by combining Rashin that allows her to sense the opponent's intentions plus her sharingan she was able to track any enemy movement and see their next action before it even happens.

Combining this with her new form, the Fist of the Water God, she was able to deflect enemy attacks and counter-attack instantly leaving even an expert who if she didn't adapt her movements would die almost immediately.

To put it simply, she was the nemesis of any Taijutsu with pre-programmed blows, "I don't think I'll have any problems for now." Yui thought and lightly closed her eyes to check how she was doing with part two of her plan.

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Meanwhile in a Konoha camp on the border, fire and screams erupted from the camp and sounds of battle and jutsu resounded through the night, "Surprise attack!" A jounin shouted to his still confused comrades and grabbed his sword to go to the front but at that moment a sinister figure jumped on one of his comrades and ripped his neck in one bite.

" But what?" The jounin wondered and caught himself trembling looking at that figure, it was one of his Konoha companions but his appearance is very different from a normal human, his skin is paler and covered in blood, horns protruded from his head and his claws sharp edges and blood-covered teeth gave him an even more demonic appearance.

"What the hell" The jounin had seen a lot in war so horrendous they would make hell look like an amusement park, but at that moment he felt an ancient fear for the being in front of him that licked its blood-covered claws and feasted on the flesh. of your companion.

"M-Monster!!!" One of his companions who also saw this screamed and tried to run away but at that moment a blue figure moved quickly and in a flash his companion's body was split in half, where he was the figure of a woman made of ice. holding a sword jutted out.

"What's going on?" The jounin felt his jaws trembling and saw the oni that killed his first mate getting up but not just him, his dead mate who had his throat ripped out stood up and his throat regenerated as if it were nothing.

The two oni stood still for a moment before turning to the jounin who was paralyzed with fear and immediately attacked him tearing him apart and eating his flesh, moments later this jounin stood up like one of them and started looking for meat to feast on.

The same scene was happening all over the rain country, onis and Yui's ice clones attacked all the camps or living beings they found without mercy, this was her true plan.

Attracting the enemy's main force while the oni made of their blood and the ice clones slaughtered the enemy's forces, years later that day would be known as the Feast of the Demons.