Naruto: Forced to activate Infinite Tsukuyomi in order to return home

Fengtian frowned, his eyes filled with doubt and confusion, as if shrouded in a layer of mist.

He searched again carefully, but the result was still very disappointing, as if he were looking for a phantom that did not exist at all.

He muttered to himself under his breath, a hint of disbelief in his voice:

"How could this be? How could Jiraiya's 'causal threads' just disappear into thin air? Could it be...?"

Fengtian gently supported his chin with his hand, his fingers slowly caressing his cheek, lost in deep thought, various possibilities swirling in his mind.

The disappearance of the causal line can only be attributed to two reasons...

One possibility is that the other party is no longer in this world, just like Orochimaru. The causal threads will naturally dissipate, like a kite with a broken string, leaving no trace.

Another possibility is that the other party is in a complex array of isolation formations, or is sealed within a powerful array.

These formations have the magical effect of disrupting the "causal lines," making it impossible for Fengtian to accurately pinpoint their location.

Judging from the current signs, Jiraiya has most likely entered some kind of isolation or sealing formation and is being hidden by some mysterious force.

At this thought, Fengtian had an idea, so he began to carefully manipulate those [causal lines], trying to verify his conjecture.

Time passed second by second, and Fengtian's brows gradually relaxed, a glimmer of understanding flashing in his eyes.

A moment later, he seemed to suddenly realize something, and all the mysteries were solved.

"Just as I thought, the causal links between Jiraiya and the remaining Jinchuriki have all disappeared. It seems they really have been hidden away..."

Fengtian murmured to himself, his voice carrying a hint of certainty and relief.

He then took a deep breath, closed his eyes again, and focused his mind, trying to find more clues about them through the [Eternal Mangekyou Sharingan] and the [Power of Causality].

However, no matter how hard he tried, he couldn't capture any more useful information.

"It seems we can only take it one step at a time."

Fengtian shook his head helplessly, but he had already made preparations in his heart.

He then left the [Divine Might Space] and returned underground.

Upon seeing Fengtian return, Madara Uchiha keenly sensed the vibrant life force emanating from him, as if he had been reborn and completely transformed.

He asked curiously:

"By the mandate of Heaven..."

"You seem very different from before..."

Upon hearing this, Fengtian nodded slightly, a faint smile playing on his lips, and then said frankly:

"As expected, I couldn't escape your discerning eyes, Lord Madara..."

"However, I'm still completely baffled by that [Sage Mode], I have absolutely no clue about it..."

Madara Uchiha shook his head helplessly, indicating that he was also powerless to help.

However, after a moment, as if struck by a flash of inspiration, he continued:

"Fengtian, didn't you say you possess the [Power of Cause and Effect]?"

"Couldn't we try modifying the causal relationship to directly learn Sage Mode?"

Upon hearing Madara Uchiha's words, Fengtian involuntarily fell into deep thought.

His gaze became unusually deep, like the most distant star in the night sky, as he began to scrutinize this unprecedentedly bold idea with complete concentration.

However, this contemplation did not last long. He gently shook his head, a helpless and bitter smile appearing on his face, and slowly replied:

"Lord Madara, your suggestion is indeed feasible, but forcibly altering such a heaven-defying 'cause and effect' would come at a price I cannot bear..."

"You may not know this, but the backlash effect of the causal relationships I can modify depends entirely on how easily they affect reality..."

"Just like our previous battle, Lord Madara..."

"The reason I haven't used the [Reversal of Cause and Effect] technique on you yet is because altering your [Cause and Effect] would have a far-reaching impact on the real world..."

"In other words, the backlash from such modifications will be unprecedentedly huge, and for me, it is undoubtedly a risk that will not be worth the losses..."

Upon hearing this, Madara Uchiha's expression slightly hardened, and a hint of understanding and relief appeared in his deep eyes.

"I see, I was too impatient."

Fengtian nodded slightly and continued:

"Lord Madara, although I cannot learn Sage Mode by altering cause and effect, I will continue to strive to find other methods."

Just then, Kakuzu spoke up:

"There's no need for all that trouble. Just find someone who can use Sage Mode, forcibly extract their chakra, and then use the power of cause and effect to claim it for yourself..."

"Similar to my [Earth Grudge Fear], it steals other people's hearts and controls their chakra..."

As Kakuzu finished speaking, Fengtian suddenly realized what was going on.

Yeah, why didn't I think of that? All I had to do was find someone who knows how to use [Sage Mode], and then use [the power of cause and effect] to take it for myself.

Furthermore, doing so will greatly reduce the backlash and infinitely diminish the effect on Fengtian!

Even more coincidentally, besides Jiraiya, there was another person who had also mastered the legendary "Sage Mode," a fact he was well aware of!

Moreover, that person is currently firmly under Fengtian's control!

Fengtian turned his head slightly, his gaze falling on the unconscious Minato Namikaze beside him. A fleeting hint of apology flashed across his eyes, but it was quickly replaced by resolute determination.

He took a step and slowly walked towards the water gate. At the same time, the mysterious and unpredictable [force of cause and effect] instantly enveloped his entire body, as if to isolate him from the outside world.

His voice was low and heavy, each word seeming to be squeezed out from the depths of his heart:

"I'm sorry, Minato..."

After saying that, Fengtian's right hand was enveloped by a ball of [causal power], and the next moment it went straight for Minato's abdomen!

In a corner to the side, Obito, who had been watching everything, had somehow switched his right eye to the Mangekyou Sharingan.

His face was grim, his fists clenched, and a faint aura of divine power unconsciously emanated from him…