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Countless explosions erupted in a cold, desolate dimension that once belonged to Kaguya Otsutsuki. Two men moved at incomprehensible speeds, clashing with each other. The men left light rays in their afterimages; one was blue, and the other was purple. When their weapons clashed, it created powerful shockwaves that could even shake the heavens. Eventually, the men took their business outside of the castle, busting through the roof. There stood Sasuke Uchiha, staring down an Otsutsuki. His fear became true: others like Kaguya exist in this world.
"I can't believe you actually exist," the thought of a whole planet of people as strong as Kaguya existing made Sasuke sweat. "Where is Kaguya Otsutsuki?"
"You don't know? She's no longer here."
"What?" (How could these inferior creatures kill one of us?) "You will tell us everything," Momoshiki said.
"No, you're going to tell me everything," Sasuke declared, pointing at Momoshiki.
A black gravitational orb appeared next to Kinshiki, making him fall out of balance. Sasuke swapped places with the orb and swung his sword at Kinshiki. Kinshiki blocked Sasuke's barrage of attacks, but Sasuke began using Shinra Tensei in an extremely precise manner during their kenjutsu exchange to apply force to Kinshiki's hands, making it extremely difficult to fight properly. Essentially, Sasuke was using a basic form of telekinesis to throw off Kinshiki's attacks.
Kinshiki pushed Sasuke away from him, which is what Sasuke wanted, as he now had the time to pull out a scroll. He performed the summoning jutsu, and hundreds of weapons appeared out of thin air. Suddenly, these weapons became electrically charged, and Sasuke launched them at Kinshiki with electromagnetism. The weapons attacked Kinshiki from various angles. Just a single strike from Kinshiki could shatter them, but Sasuke kept swapping places with them. The constant teleportation of the Uchiha, combined with his Sharingan precognition, made him nearly impossible to hit.
Kinshiki kept swiftly avoiding Sasuke's demon wind shurikens and sword strikes. A sharp ice spike emerged from right underneath Kinshiki, forcing him to jump up to avoid it. Thanks to Sasuke's Rinnegan and his own skill, he didn't need to make hand signs anymore. He could just do whatever he wanted to; he had learned to use ice release in his spare time, remembering the fearsome power his former rival Haku had. He had yet to grasp the full power of ice release, though.
Sasuke teleported to Kinshiki, kicked him far away, and then summoned a small portion of his Susanoo to fire an electrically charged Susanoo arrow. The extremely strong electric charge at the tip of the arrow broke down the air in front of the arrow into plasma, which then got pushed away, allowing the arrow to fly at an extreme speed with no wind resistance.
Sasuke then swapped places with the arrow, retaining the speed the arrow was traveling at. He summoned a Susanoo ribcage with one arm to punch Kinshiki into a cliffside. Sasuke then started performing his own kenjutsu version of Lion's Barrage on Kinshiki. Sasuke and Kinshiki tore through the cliffside as Sasuke kept spinning at such speeds it made even him dizzy. Sasuke was cutting through Kinshiki with his sword like a sawmill by spinning extremely fast. When they reached the ground, Sasuke finished it off with a powerful downward kick causing a shockwave that could destroy a nearby building.
Sasuke put some distance between himself and Kinshiki; he began panting. He had expended too much chakra and tired himself out physically. This high level of fighting for so long was not sustainable for long.
(If he were alone, I would try ripping his soul out now, but that other Otsutsuki hasn't even moved yet. I don't have enough chakra to fight him too. His skin... The big guy's skin is extremely durable. I could only cause superficial cuts that will hurt like hell, though.)
Kinshiki tried to get up but quickly fell down. His breathing became shallow, and he struggled. "You bastard! What have you done to me?"
Sasuke smirked. "A powerful neurotoxin. Courtesy of Orochimaru."
(He poisoned his sword? Dammit.)
Sasuke created a black portal into which he vanished.