DXD: Naruto Recreation System

The battlefield was a shattered inferno, magma flowing like rivers and ash choking the air. Itachi knelt within his massive Susanoo, its form radiating an eerie, crimson glow. His body trembled, pushed to the brink of exhaustion, blood streaming from his eyes as his breathing grew ragged. Even with the strength of his Sharingan, the unrelenting might of his opponent weighed heavily on him.

Above him, Lord Phenex hovered in his blazing phoenix form, radiating divine and demonic energy in equal measure. His golden flames burned hotter than the molten earth below, his massive wings casting an oppressive shadow over the battlefield. His voice echoed like thunder.

"Itachi Uchiha, your will is commendable, but your strength has reached its limit. Surrender and accept your defeat."

Itachi's response was a whisper, spoken within his own mind.

"System, allocate remaining chakra reserves from Kisame."

The cold, mechanical voice of the system responded.

[Confirmed. Allocating chakra.]

A surge of energy coursed through Itachi, replenishing him momentarily. Kisame's chakra merged with his own, granting him a brief reprieve. But it was not enough.

"System," he continued, his voice sharp and resolute. "Unlock the Three-Tails' chakra. All of it."

[Warning: Full depletion of the Three-Tails' chakra will result in critical physical and mental strain. You will also lose three tails chakra Proceed?]

"I don't care. Do it now."

The ground trembled as the energy of the Three-Tails erupted within Itachi, intertwining with his chakra. A bluish aura enveloped his Susanoo, merging with its crimson radiance. The new surge of power revitalized him, even as it came at a heavy cost.

The Susanoo began to shift, growing larger and more defined. Its ethereal armor solidified, and its form became a towering titan of nearly 300 meters. In its right hand, the Sword of Totsuka shimmered with a deadly, spectral light, while in its left, the legendary Yata Mirror gleamed, its surface reflecting the chaos around it. The Susanoo's very presence distorted reality, exuding an aura of invincibility.

Phenex faltered for the first time, his golden eyes narrowing in astonishment.

"So, this is the full power of the Uchiha clan... Impressive, but it won't save you."

With a deafening screech, Phenex spread his flaming wings wide. His body erupted into a fiery inferno as massive magic circles materialized around him, each pulsating with ancient runes of destruction. The battlefield trembled beneath the weight of their energy.

"You will witness my full wrath, Uchiha! Prepare yourself!" Phenex roared, his voice shaking the heavens.

As lord Phenex unleashed his full power, six massive magic circles appeared in the sky, each ready to deliver devastating attacks.

The first, Eternal Phoenix Flare, was a colossal wave of golden fire that engulfed the battlefield, consuming everything in its path. Itachi's Susanoo was nearly overwhelmed by the intensity of the flames.

Next came the Crimson Feather Barrage, as Phenex's wings released a storm of razor-sharp, fiery feathers. They hammered into Susanoo, shaking its ethereal armor and leaving it battered.

Then, the Infernal Pyre Storm twisted into existence, creating a vortex of searing flames that choked the air and threatened to suffocate the Susanoo with its heat.

With lightning speed, Phenex summoned the Solar Flame Prison, massive chains of molten fire erupting from the ground to bind Susanoo. The molten chains constricted, burning into the construct's defenses.

The Meteor Strike followed, with flaming meteors crashing down, leaving craters and sending shockwaves that rattled the battlefield and weakened Susanoo's form.

Finally, Phoenix's Cataclysm unleashed a destructive beam of concentrated golden energy, striking Susanoo with the force of a thousand suns, burning through its defenses and shattering the air around it.

Each attack battered Susanoo relentlessly, pushing it to its limits, while the battlefield was reduced to a fiery wasteland.

Itachi remained still within the Susanoo as the Yata Mirror moved with uncanny precision. The legendary shield absorbed the waves of fire, deflected the razor feathers, and nullified the searing chains of the Solar Flame Prison. Even the Ashen Meteors crumbled against its divine surface.

When the Phoenix's Cataclysm struck, it was as if the heavens themselves exploded. The beam clashed with the Yata Mirror, the impact creating a massive shockwave that tore through the battlefield. The ground split apart, magma erupted skyward, and the very air rippled with destructive force.

Inside his Susanoo, Itachi's Sharingan spun rapidly, blood pouring from his eyes as he focused all his remaining strength into his defense. The mirror held firm, but the strain on Itachi's body was immense. The mirror manage to absorb 40% of the destructive power.

As the dust settled, the battlefield was silent, the ground reduced to a molten wasteland. Phenex hovered in the air, his flames flickering but his resolve unbroken. Below, Itachi's Susanoo stood tall, slight cracks forming along its armor but its power undiminished.

Phenex narrowed his eyes.

"You've deflected my power, Uchiha. But can you truly withstand the eternal fire of the Phoenix?"

Itachi's voice was calm but ice-cold.

"You underestimate the power of uchiha clan which is Considered as Strongest, Lord Phenex. Brute force alone will not win this battle."

The Susanoo moved with sudden, terrifying speed. In an instant, it ascended to Phenex's level, the Sword of Totsuka glowing with spectral energy. The blade slashed downward, aiming directly for Phenex's chest. The phoenix lord evaded, retaliating with a flaming strike of his own, but the Susanoo's speed and precision were unmatched.

The two titans clashed in the sky, their blows creating shockwaves that shattered the earth below. Phenex unleashed torrents of golden flames, but the Susanoo's Yata Mirror absorbed each attack, leaving him vulnerable. With a final burst of speed, the Susanoo's sword struck true, piercing through Phenex's blazing form and pinning him to the molten ground.

Phenex let out a deafening screech as the Sword of Totsuka began to seal his essence. The flames around his body flickered and dimmed as the blade's spectral energy drained his power.

"You fought valiantly," Itachi said, his voice filled with respect. "But this is the end."