As a Grey Knight In Naruto

Obito wheezed as he stood, arms slightly raised, trying to ignore the pain pulsing in his ribs. The blow Hajime had landed wasn't just powerful, it had felt inhuman. He had phased in only for a millisecond, and yet that instant had been all Hajime needed to hurt him.

Still, Obito smirked behind his mask. "You're strong," he muttered. "But not untouchable."

Hajime said nothing.

Instead, he reached behind his back and pulled out his halberd. The weapon gleamed under the cracked ceiling light, its edge shimmering with an eerie glow. With a single smooth motion, Hajime lunged.

The halberd cut through the air at a blinding speed.

Obito barely activated Kamui in time. The blade slashed past, missing by inchesbut it was close. Too close.

He staggered back, breath short, but the smirk returned to his lips. "You can't touch me while I'm in this state," he said. "Kamui makes me untouchable."

Hajime halted. Then raised the halberd skyward.

The air changed.

Around the halberd's blade, a swirl of unnatural light gathered. It wasn't lightning. It was heavier, denser. Woven with pure warp energy, raw and wild. It cracked and hissed like reality itself was unraveling. The warp lashed out, coiling around the blade like a serpent made of light and pressure. Space bent. Walls trembled.

Then Hajime swung it.

A diagonal arc of tearing power burst forward.

Obito's eye widened. His Kamui was active, he was intangible.

And yet

Slash!

The halberd carved through space. It ripped into Obito's side. Blood sprayed. His right arm was severed clean off.

"Aghhh!" Obito screamed in disbelief. His body staggered. He dropped to one knee, clutching his bleeding side. His Kamui had not saved him. His defense, his ultimate protection, it had failed.

"You rely too much on that illusion of safety," Hajime said, his voice like cold steel. "Obito. You were manipulated, twisted into a tool. And a weak one."

Obito's anger flared. He forced himself to stand, breathing hard. Blood dripped from his side, but he raised his hand.

"Then try this!"

He clapped his palms together and slammed them to the floor. "Wood Style: Cutting Spikes!"

Thick wooden spears erupted from the ground beneath Hajime's feet. The attack was meant to pierce, to trap.

But Hajime didn't move.

The spikes hit his armor, and shattered.

Not a scratch. Not a dent.

Obito roared and followed up. "Fire Style: Bomb Blaze Dance!"

He sent out a storm of fireballs. The chamber lit up in flames, smoke filling the air.

Still, Hajime walked forward, through the fire.

The flames licked his grey-silver armor, but left no mark. His stride was calm, steady, unshaken. His golden halo flickered behind him, protecting him with a field of psychic power.

Obito backed up. Panicking now.

He fired more attacks. "Fire Style: Dragon Flame Bombs!"

A stream of fire burst toward Hajime, engulfing everything.

But Hajime moved.

He stepped forward with a burst of speed and vanished. He reappeared a second later, right in front of Obito.

The sudden appearance made Obito's heart freeze.

With a single swing, Hajime brought the halberd down.

From shoulder to waist, it cut Obito in half.

Obito's legs stood upright for a second, disconnected from his upper body. His torso dropped. He landed on his back with a dull thud, blood pooling around him.

Still alive. Still conscious.

And now, helpless.

The world swam before his eyes.

He looked at his legs, still standing, still twitching.

And then he saw her.

Rin. That gentle smile.

Kakashi, eyes shadowed with guilt.

The past rushed in, blurry, painful. Everything he had thrown away. Everything he had become.

Above, Konan spread her paper wings, now carrying Nagato high into the air. She was escaping, trying to flee with what strength she had left. Nagato hung limp in her arms, supported only by the paper limbs wrapped around his broken frame.

Hajime looked up slowly.

His eyes narrowed.

He raised one gauntleted hand.

Psychic energy surged around him, and with a sharp pulse, Konan and Nagato were pulled downward. Invisible force yanked them from the sky like puppets cut from their strings. They fell, but gently, caught midair and lowered to the ground as if by gravity's cruel mercy.

Konan landed on her knees, shielding Nagato's body, her wings flaring out again, preparing for another defense. But her breath was ragged, chakra waning.

Moments before this, in the shadows below the tower, Black Zetsu had already sensed the end.

He watched Obito being struck down. The sight made his expression twist with rage.

"White Zetsu," he hissed. "Contact the remaining Akatsuki. Bring them here. All of them. Now."

A white pod bloomed beside him, and the clone responded, "Understood." It vanished into the roots.

Back to the present, Hajime tilted his head slightly.

His precognition triggered.

He saw it.

A bolt of lightning chakra racing toward him from the left, a sneak attack.

Without turning, he moved.

He stepped aside in a smooth, calm motion, avoiding the blast by a hair's breadth. It passed by him and exploded against the far wall, leaving scorch marks.

Everything behind and beside Hajime was obliterated, machines, pillars, even the walls. A nearby building collapsed from the force. Yet Hajime remained still. Unmoved. Untouched. Like he had seen it all before.

He turned.

Kakuzu stepped into view, lightning mask glowing on his shoulder.

More footsteps echoed behind him. A shadowed figure with a stitched mouth. A red scythe glinted. A massive form loomed beside him.

Then came another, calm, quiet, deadly.

Uchiha Itachi stepped forward, eyes locked on Hajime.

The remaining Akatsuki had arrived.

And Hajime… smiled.

(Ps. Sorry for the short previous chapter)