"During the Warring States period, Uchiha Madara led the Uchiha Clan in battles against the Senju, frequently using the Mangekyou Sharingan. In the end, his eyes lost their light. You've heard of this, right?"
"I have. According to family records and village rumors, Uchiha Madara supposedly took his younger brother Uchiha Izuna's eyes."
Itachi thought for a moment before giving what seemed like the most reasonable answer.
At least, it was reasonable from the village's perspective.
Some people, who didn't know the truth, painted Madara as a power-hungry villain willing to do anything for strength.
Could that really be true?
Yan found it ridiculous.
He had to admit, Tobirama Senju went to great lengths to smear Madara's reputation.
Of course, the Uchiha themselves played a role in this outcome.
Madara had wanted to lead the Uchiha out of the village, but his war-weary clansmen refused to follow him.
Yet, Madara's influence on the clan was too deep. The old patriarch, wanting full control of the family, saw no other choice but to align with Tobirama's narrative and completely discredit Madara.
Both sides ended up portraying Madara as a villain.
That's how the story of Madara losing his sight and taking his brother's eyes came to be.
"If it were you, would you ever lay a hand on Sasuke?"
"Uh…"
Itachi hadn't expected such a comparison. Without even thinking, he immediately shook his head.
He would rather go blind than take Sasuke's eyes.
But why was the elder making this comparison? Could it be that Uchiha Madara…
Seeing Itachi's realization, Yan nodded slowly.
"You guessed right. Uchiha Madara had his flaws, but like you, he cherished his younger brother.
He would rather go blind than harm him.
As for the village rumors and family records, just take them with a grain of salt. Back then, when the Uchiha didn't follow Madara out of Konoha, the old patriarch—your grandfather—had to erase Madara's influence to secure control over the clan. Smearing Madara's name was part of that.
And unfortunately for Madara, our dear Second Hokage never stopped targeting him."
"The Sharingan has limitless potential, and the Mangekyou is just one part of it.
After Uchiha Madara took his brother's eyes, he gained even greater power. With an endless supply of visual energy, the Mangekyou became what is known as the Eternal Mangekyou.
Of course, 'Eternal Mangekyou' is just my personal name for it."
"So..."
Itachi started thinking of some unsettling possibilities.
"So don't overthink it."
Just as Itachi's heart began to race, Yan chuckled.
"I'm telling you this just to give you more information about the Sharingan, nothing else. So don't let your mind wander."
"Back to the point—Mangekyou's visual energy is limited. Once you use it up, it doesn't come back. That's why overuse leads to blindness."
Yan gave Itachi a serious warning.
"That's why you shouldn't waste your eyes' power unless necessary. It won't do you any good—unless you want to pave the way for Sasuke to become the next Uchiha Madara."
Itachi: "..."
I just awakened the Mangekyou, and Elder Yan is already giving me all these warnings. Is this really necessary?
"Use your mental strength to explore. You'll find something hidden deep within your bloodline.
It's a big one—powerful, but also easy to lose yourself in."
Mastering Susano'o doesn't necessarily require unlocking the Mangekyou first.
This thing is already in Uchiha blood. Having the Mangekyou just means you now have the right to control it.
Look at Uchiha Madara—he lost the Rinnegan, yet with just an ordinary Three-Tomoe Sharingan, he could still use Susano'o. Now that's a true monster.
"Just like the Sharingan, Susano'o has different stages.
At first, you can only summon a few skeletal structures. The more visual energy and chakra you use, the more complete it becomes.
Normally, only the Eternal Mangekyou can handle a fully-formed Susano'o."
"That's because a regular Mangekyou can't withstand such heavy consumption."
"If your Mangekyou can maintain a matured Susano'o, that's already impressive.
Remember this—just like the Mangekyou, when it comes to Susano'o, if you can get by with just a few bones, don't waste energy forming a full-body version.
Sure, it'll make you look powerful, but it'll also burn through your eyes' energy faster."
"Besides Susano'o, the Mangekyou's built-in eye techniques also drain a huge amount of energy. If you can avoid using them, do so as much as possible."
Yan's words sank deep into Itachi's mind.
If it weren't for how strange it would look, he'd probably pull out a scroll and start taking notes on the spot.
"With the Mangekyou, our mental strength increases significantly. This makes it much easier to control Genjutsu, and its power also rises.
For most battles, the Three-Tomoe Sharingan is enough. You specialize in Genjutsu, so this ability will improve greatly for you."
After awakening the Mangekyou, Itachi could already feel that Genjutsu was easier to control.
As for whether its power had increased, he hadn't tested it yet—mainly because he had no use for it in the village.
Other abilities were easy to test, but Genjutsu was trickier.
"Alright, activate your Sharingan and use one of your best Genjutsu techniques on me.
I want to see how much your control has improved."
Yan curled his finger, signaling Itachi to use him as a test subject.
"...."
Itachi froze for a moment, then instinctively shook his head. "Elder, I'm afraid I can't control it..."
"Just do it. If you can control me, I'll tell you more secrets about the Sharingan."
"...."
Secrets—Itachi wanted to know them, but he really didn't dare to act.
Yan waited for a while and saw that Itachi still had his head lowered in silence. He couldn't help but laugh in frustration.
"Get lost. You don't even have the guts for this? If you're too scared to try it on me, then go find Shisui and test it on him instead."
"Also, pass on my exact words to him. He'll understand what I mean."
Most people were afraid of Itachi's Genjutsu, but Yan wasn't one of them.
After all, when two people who specialize in Genjutsu try to control each other, it's extremely difficult.
Besides, their mental strength wasn't on the same level. Itachi trying to affect Yan with Genjutsu was nearly impossible.
"Understood."
Seeing that Yan wasn't insisting on using Genjutsu on him anymore, Itachi let out a sigh of relief.
He really didn't dare to experiment on Yan. If word got out, he'd be in serious trouble.
Not to mention, there was a good chance Yan would turn the tables on him instead.
As he watched Itachi quickly leave, Yan muttered to himself,
"I wonder what would happen if I countered Itachi's Tsukuyomi with my own Will Judgment?"
Saying that, he touched his eyes.
"Some powers really are addictive."
Under his palm, his Sharingan began to spin, revealing the Mangekyou.
Compared to before, Yan's Mangekyou Sharingan now had some irregular patterns.
"Sir."
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