Author's note: I always imagined what someone from the Naruto universe who wasn't Naruto would look like. This Sasuke is in his version from The Last.
The vacuum between dimensions was not silent; it roared with the sound of spatial rifts opening.
Sasuke Uchiha gasped, cold sweat mingling with the blood that trickled from a cut above his left eyebrow. The Rinnegan in his left eye throbbed with a sharp pain—a clear sign that his chakra reserves were dangerously low after jumping through three consecutive realities.
Ahead of them, the massive silhouette of Kinshiki Otsutsuki floated, wielding a crimson energy halberd that glowed with an ancient bloodlust. Further back, seated on a root of the withered Divine Tree, Momoshiki watched everything with a mocking smile, devouring chakra pills as if watching a mediocre spectacle.
"Persistent tracker..." Momoshiki murmured, his voice echoing unnaturally. "Just hand over what's left of your chakra and your death will be swift."
Sasuke didn't answer. His hands tightened on the Kusanagi's hilt. In his prime, he knew he could seal Kinshiki, but exhaustion was poison. Each clash of blades against the Otsutsuki giant sent vibrations that made his bones crack. Kinshiki was brutal, fast, and relentless.
"I need to get out of here," Sasuke thought, his Sharingan reading Kinshiki's next attack. "Now."
The giant Otsutsuki advanced, splitting reality with a vertical strike. Sasuke used Amenotejikara, switching places with a floating rock, and in a fluid movement, sheathed his sword and focused the rest of his energy into his left eye.
— Kaimon! — he roared.
A dimensional rift began to tear open behind him. It was his ticket out. But Momoshiki, realizing the intention, narrowed his eyes.
"Naive."
In the millisecond that Sasuke leaped toward the portal, Momoshiki raised his right hand. The red Rinnegan in his palm glowed, emitting a shockwave of spatial interference. The portal, which should have been bluish and stable, distorted into a violent and unstable purple.
"Die, you inferior creature!" Kinshiki roared, condensing all his chakra into a massive energy blade, launching it like a projectile against the portal just as Sasuke entered.
Sasuke felt the world crumble. Kinshiki's technique struck the portal's structure, causing a chain reaction.
— Susano'o!
Ethereal ribs of purple chakra instantly manifested around him, but the dimensional instability was too powerful. Kinshiki's attack exploded within the spatial tunnel, fragmenting space-time. Sasuke felt the impact crush his defense; the sound of Susano'o's bone cracking was the last thing he heard before the vacuum pressure engulfed him.
The light gave way to absolute darkness. The weight of gravity vanished, replaced by a sensation of endless freefall.
He was adrift. Without a destination. Without chakra.
Then, out of nowhere, a sliver of light appeared. It wasn't the cold glow of the Otsutsuki dimensions, but the warmth of a real sun. Below it, a volcanic island surrounded by dark waters and castles of black stone emerged through the clouds.
The last Uchiha closed his eyes, losing consciousness as his wounded and exhausted body plummeted like a meteor towards what appeared to be an island.
..........
The Dragonstone Hall was immersed in the tranquil routine of a family lunch. Rhaenyra watched her children at the table, a moment of peace amidst the tensions of war, when the world seemed to have turned upside down.
A titanic roar shook the foundations of the fortress. The ancient stone walls trembled, and the sound of falling silver plates was drowned out by a noise from the sky that none of them had ever heard. Outside, panic was audible: the roar of dragons rose in a chorus of agitation, sensing the drastic change in the atmosphere.
Before Rhaenyra could speak, the castle guards burst through the double doors, panting.
"Princess! Something fell from the sky!" announced the officer, his voice trembling. "It came from the clouds like lightning; the impact was near the cliffs!"