Naruto: Uchiha Izuna with system

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Even as the massive bone walls served as shields against the raging flames, they crackled and splintered under the intense heat, threatening to collapse.

"Spread out! Form teams and attack from multiple directions!"

Kaguya Manro, having previously fought Izuna, quickly issued orders.

The moment the command left his lips, the bone wall shielding him shattered explosively. A magatama spiraled through the air, narrowly missing his ear. Blood spattered as over ten Kaguya ninjas were sliced apart in an instant.

Kaguya Manro squinted at the towering figure before him, a silver-white chakra skeleton giant.

"Susanoo?"

Clenching his teeth, Kaguya Manro shouted, "Spread out and focus your attacks on a single point! Chakra may regenerate Susanoo's damage, but no one's chakra is infinite!"

Kaguya's previous encounter with Susanoo had demystified the technique somewhat. To them, the legendary defense was no longer invincible, as Uchiha Itachi would later say: "Every jutsu has a weakness."

Within moments, the Kaguya clan members dispersed into small teams of about twenty, strategically surrounding Izuna. This tactic reduced casualties from Izuna's devastating area-of-effect attacks.

"A clever strategy," Izuna mused, his voice calm yet tinged with amusement. "But it only works if you can outlast me."

With the Eternal Mangekyō Sharingan, Izuna's chakra reserves rivaled even those of Senju Hashirama, making him nearly unmatched in the Warring States Period. For Kaguya to have a fighting chance, they would need at least twice their current number.

Susanoo's skeletal frame rapidly evolved into its mature form, armored with thick plates of chakra. Crimson, malevolent eyes glowed under the helmet, a reflection of the power contained within.

With a flick of his right eye, Izuna ignited Amaterasu. The black flames coalesced into a massive sword in Susanoo's hand.

"Alright, let's begin," Izuna said nonchalantly, as though this were a mere game.

Kaguya Manro gritted his teeth. He had faced this form of Susanoo before and knew firsthand the monumental effort it took to break through its defenses. Still, he took solace in the fact that the terrain was to their advantage.

"Attack!"

At Manro's command, Kaguya ninjas rushed forward, their bone spurs gleaming ominously.

To counter Amaterasu, the Kaguya clan had developed a unique countermeasure: separating the affected skin and bones to neutralize the flames. However, Susanoo's sheer physical power far exceeded ordinary attacks, making it a formidable challenge.

Izuna smirked as countless Ten Finger Piercing Bullets rained down on him. They were little more than nuisances, incapable of penetrating Susanoo's outer shell.

Instead, he focused on the more dangerous adversaries—those above jonin level. With a single swing of Susanoo's Amaterasu-infused sword, the battlefield was engulfed in chaos.

Screams echoed as several Kaguya ninjas were bisected. While their unique abilities allowed them to survive Amaterasu, nothing could save them from being cleaved in half.

The battlefield was a whirlwind of death and destruction. Spiral-shaped bone spears bombarded Susanoo, striking multiple points in rapid succession.

Despite Kaguya Manro's earlier directive to focus their attacks on a single area, the chaos made coordination nearly impossible. Izuna easily repaired any damage to Susanoo's armor with his immense chakra reserves.

"Is that all you've got?" Izuna taunted, his Eternal Mangekyō Sharingan scanning the battlefield.

With one hand, Susanoo wielded the Sword of Amaterasu. In the other, it conjured the Yasaka Magatama, hurling the spiraling projectiles with deadly precision.

Boom! Boom! Boom!

Explosions rippled through Kaguya Village as black flames consumed everything in their path. The relentless assault left swathes of destruction in its wake.

"Clan leader!"

Kaguya Takeri rushed to Manro's side, his face pale with fear.

"How long until Senju Hashirama arrives?" Manro asked, his voice low but tense.

On the surface, he appeared calm, issuing orders to maintain morale. In truth, he was barely holding it together. With every passing moment, more of his clan members fell, and Izuna showed no signs of weakening.

Takeri hesitated before answering, "If Kaguya Takehikari reached him as planned, Senju Hashirama should already be on his way. The question is, how long will it take him to get here?"

Manro nodded grimly. He had only met Senju Hashirama once, but that was enough to recognize the man's character. He was certain Hashirama would not abandon an ally in need.

"In that case, we must buy more time. Inform the clansmen to shift their focus from offense to defense," Manro ordered.

Takeri furrowed his brows. "Why not use the news of Hashirama's arrival to intimidate Izuna? It might force him to retreat voluntarily."

Manro shook his head.

"Why not?" Takeri asked, confused.

Manro's voice turned icy. "We've already suffered too much at the hands of Uchiha Madara and Uchiha Izuna. Letting either of them escape unscathed would be an insult to our fallen."

"Clan leader, you mean…"

"We will stall Izuna until Hashirama arrives. Together, we'll crush him."

End of the Chapter.