Sasuke's Chakra-Enhanced Strength was naturally learned from Orochimaru. It would be a waste to have such a great physique if he didn't learn a powerful Taijutsu.
Using his strengths to attack his weaknesses, Itachi would definitely be no match for him in a Taijutsu battle, but Susanoo is no pushover either; even Tsunade Susanoo have a hard time breaking through it.
Sasuke at this point certainly can't reach Tsunade's level of strength, but he can still put up a fight with Itachi for a short time.
A Heavenly Foot of Pain slammed into Susanoo's fist, the powerful force causing him to stagger back a step.
Sasuke was thrown five meters away, his footsteps leaving two bloody scratches on the ground, as well as a bloody five-finger mark.
"Still not working! Is this the true power of the Uchiha Clan?"
Despite feeling a faint numbness and pain throughout his body, Sasuke showed no sign of discouragement; instead, his eyes gleamed with determination.
He will also possess this ability in the future, and although he is currently at a slight disadvantage, he is not without the power to resist.
He believed that such a powerful technique must have taken a heavy toll on Itachi, and it was impossible for him to maintain it for a long time.
"Have you run out of tricks? Your current performance won't make me use my full strength!"
Itachi wiped the blood from the corner of his mouth again. Although Sasuke's attack had not harmed him, just as Sasuke had said, the Susanoo indeed quite taxing on his body.
It was entirely due to the heavy physical strain caused by his continuous outbursts, which led to a relapse of his old illness.
Looking at the battles between Sasuke and Itachi in the Original Work, we can see that Sasuke didn't inflict much damage on Itachi; his own physical condition played a large part in the problem.
Seeing Itachi retract his Susanoo, Sasuke stood up again, panting heavily.
In just a few breaths, although blood was still dripping from Sasuke's blood-soaked fist, the torn flesh had already healed.
Itachi's eyes narrowed slightly upon seeing this. The speed of healing was truly astonishing. No wonder Sasuke dared to attack him relentlessly despite his injuries.
"Although I dislike that guy a bit, he has indeed taught me a lot over the years, and I've made ample preparations to defeat you!"
Upon hearing this, Itachi remained expressionless, but Orochimaru, who was secretly watching from the other side, smiled. Was this a compliment to him?
Although Sasuke is still far from being molded into his likeness, he has taught him almost everything he could, making him the darling of the Ninja World.
This isn't Orochimaru boasting; he possesses the richest Ninjutsu resources in the Ninja World. If Sasuke hadn't lacked elemental attributes, he could have truly trained him into an all-around ninja like Orochimaru or Jiraiya.
Before Sasuke could finish speaking, he reached into his chest and peeled off a sealing talisman.
This scene made Itachi narrow his eyes again. Under his Sharingan, Sasuke's Chakra was like a floodgate had been opened. Even Itachi was a little shocked by the amount of Chakra.
"It seems Sasuke has indeed grown a lot. Is this his true strength?!"
A sense of relief welled up within him, and at this moment he felt somewhat grateful to Orochimaru, and even the previous trap he had been set by Orochimaru was no longer so unpleasant to him.
After tearing off the sealing talisman, Sasuke immediately interlocked his fingers, and the Chakra within his body began to flow rapidly.
Upon noticing Sasuke's actions, Itachi did not take the opportunity to attack. On one hand, he needed to slow down and recover his Chakra; on the other hand, he wanted to see what other tricks Sasuke had up his sleeve.
What exactly is the source of their confidence in defeating Susanoo?
After a while, Sasuke had been keeping his eyes closed, suddenly opened them again and immediately formed several complex hand seals.
"Sage Mode - Activated!"
Before he could finish speaking, Sasuke's clothes burst open from the back, revealing a long, thin, black wing and a dozen snake heads on his back.
Two pairs of cone-shaped horns grew from his head, and snake-shaped eyeshadow appeared around his eyes. If he didn't have the Sharingan, his pupils would probably have turned into snake eyes.
This is Sasuke's complete Sage Mode. Even Itachi would have to strain his eyes to recognize that this is his very familiar little brother.
"Is this what you're relying on? The legendary Sage Mode, it does seem quite plausible!"
As he spoke, the crimson Susanoo reappeared behind Itachi, and this time it was not just a bone arm and rib, but the entire Susanoo skeleton.
The skeleton was holding a gourd in its hand. With a squeeze of its hand, the gourd instantly transformed into a crimson longsword, which was the Sword of Totsuka, one of the Kusanagi Swords.
Itachi secretly observed Sasuke's expression, and only breathed a sigh of relief when he saw that Sasuke still looked confident.
Itachi went to great lengths to avoid scaring his little brother, otherwise he might have frightened Sasuke by immediately unleashing his Perfect Susanoo.
With such formidable strength, how can we even stage a war? The Battle of the Pacific wouldn't be enough; we'd have to add the Atlantic Ocean War to the mix.
"Is this the Susanoo of the Uchiha Clan? It's awe-inspiring no matter when you see it!"
It emerged from the basement a long time ago and was watching the battle from some corner.
Upon hearing White Zetsu's words, Black Zetsu's eyes also showed a hint of reminiscence.
So many years have passed, Susanoo of Indra and Uchiha Madara is still vivid in my mind, and now I see a familiar scene in Itachi.
"It certainly evokes nostalgia. How should Sasuke deal with this?"
"I think his Sage Mode is quite formidable; he should be able to put up a fight, right?"
While they were puzzled, Itachi suddenly smiled, the first time he had smiled since the start of the battle.
He was pleased that his little brother had stood up for himself, and that the Uchiha Clan had a worthy successor!
However, that smile seemed particularly jarring to Sasuke, as if Itachi was mocking him for being pretentious, which once again stung Sasuke's heart.
"Summoning Jutsu!"
As a large cloud of smoke rose, a gigantic serpent appeared before the weasel.
This giant snake was entirely crimson and had lost an eye, but the single remaining eye made it look even more ferocious. It was none other than Garaga!
"Uchiha brat, you're in big trouble this time!"
Garaga looked at the Susanoo in front of him and said to Sasuke on his head in a low voice.
Don't worry! I won't leave you to fight alone!
Before he finished speaking, he formed another hand seal, and even thicker smoke rose up again.
When Garaga appeared, Itachi wasn't too surprised, but when he saw the eight-headed serpent, his pupils couldn't help but dilate slightly.
"This is... the Eight Branches Technique!"
"I never expected Orochimaru to pass this technique on to Sasuke. That guy is really surprising!"
Both White Zetsu and Black Zetsu exclaimed in amazement, noting that the Forbidden Jutsu from ancient legends possessed eight times the combat power of Manda, and was equally formidable.
In the Original Work, Sasuke did not control the Eight Branches Technique, so it seemed somewhat weak, and he was also caught off guard by the Totsuka Blade.
This time, Sasuke has control, and with the cooperation of Garaga and Sasuke, they won't be defeated so easily!
But Sasuke has far more tricks up his Susanoo Sasuke; he doesn't think he can defeat Itachi with just two beasts.
The next moment, something happened that completely shocked everyone present. Sasuke bit his finger again, formed several hand seals, and then slammed it on the ground once more.
"Wood Release: Deep Forest Emergence!"