According to the mural, the three artifacts depicted are all spirit entities, existing within the realm of Susanoo.
These items are not just ordinary tools; their power is tied to the abilities granted by Susanoo.
When a Susanoo reaches a certain level, it can tap into such powerful artifacts, similar to how Itachi used the Yasaka Magatama, a manifestation of his own Susanoo's power.
"The power of Susanoo is truly enviable, but it seems difficult to activate it with just one eye," Kakashi mused.
In the original timeline, Shisui managed to activate Susanoo with only one eye, even after Danzo took his right eye, while Uchiha Madara took things even further by summoning Susanoo without eyes.
In other words, the existence of Susanoo is tied to the presence of a Mangekyō Sharingan. Once activated, Susanoo doesn't require the Sharingan to continue, though the ability to summon it initially depends on the Mangekyō Sharingan.
Unfortunately, Kakashi has never possessed a Mangekyō Sharingan, so he is unable to activate Susanoo.
In the original events, Kakashi's Susanoo was notably powerful, though it was short-lived.
Now, Kakashi could only wish for the ability to summon such a formidable power.
This place, filled with information about the three great artifacts, along with the presence of Rashomon, only deepened Kakashi's curiosity about who had left these treasures behind.
When considering the supernatural powers of the three artifacts, it was hard not to envy Itachi's Susanoo, which was equipped with the Ten-Fist Sword in its right hand, the Yata Mirror in its left, and the Yasaka Magatama.
These were extraordinary tools.
Seeing Susanoo with these artifacts in hand was awe-inspiring.
Perhaps Itachi's deteriorating health played a role in his reliance on such powers, Kakashi thought.
After absorbing this amazing information, Kakashi didn't linger.
This place held little value for him—Rashomon, though impressive, was useless without the corresponding contract.
Kakashi turned to leave and soon found himself back at the cave's entrance.
Upon seeing Kakashi emerge, Seven Prisons hurried forward, eager to know what Kakashi had found.
"How was it? What did you find inside?" Seven Prisons asked.
"There's a five-layer Rashomon inside, but without the contract scroll, it's completely useless," Kakashi replied, his tone straightforward.
Seven Prisons seemed a bit disappointed by this news.
"Seven Prisons, what are you planning to do next? Rebuild Hell Valley?"
"I will rebuild Hell Valley, but not just yet. I need to take my revenge first," Seven Prisons replied solemnly.
"Understood. I'll help you when the time comes."
"Thanks, Kakashi. Your support means a lot."
"No need for thanks. We're comrades now. It's the least I can do," Kakashi said, offering a small smile.
Seven Prisons gave Kakashi a thoughtful look, a hint of restlessness in his gaze.
"Well, we should head back now."
"Right."
With that, they left Hell Valley behind. Kakashi didn't plan on staying any longer; after all, the area was dangerously close to the Land of Rain.
At that moment, a figure appeared at Mount Myoboku—Kakashi, clad in a black imperial robe with his silver hair gleaming under the sun.
Having settled his affairs, Kakashi had come to Mount Myoboku with a singular focus: improving his strength.
As soon as he arrived, he noticed a familiar figure.
"Master Fukasaku," Kakashi called out respectfully, recognizing the legendary toad.
"Ah, little Kakashi, you've finally arrived! It's been quite some time, hasn't it?"
"Apologies, I was delayed by other matters."
"Alright, let's get started. The curse mark on your neck has been eroding your body. If you don't take care of it soon, it will become a major problem."
"I know, Master. I'm ready to begin."
"Then come with me."
With that, Fukasaku hopped toward a large brown waterfall.
"Little Kakashi, before we begin with Sage Mode training, let me explain what natural energy is. Sage Mode involves absorbing natural energy from the environment."
"As you know, chakra is formed by combining physical energy and spiritual energy. Sage techniques add natural energy to this mix. The key is balance—each energy source should be equally distributed. If the ratio is off, the user risks becoming like the stone frogs here in Myoboku Mountain, creatures that failed in their attempt at Sage Mode because their natural energy absorption was imbalanced."
"Even a slight imbalance can lead to disastrous transformations. Take Jiraiya for example—despite his immense chakra reserves, his talent in Sage Jutsu was average, leading to a slow and imperfect mastery of the art."
"Minato also trained in Sage Mode. His chakra reserves were substantial, but what set him apart was his natural aptitude for Sage techniques. While his progress was slow, his mastery of Sage Mode was far superior to Jiraiya's."
"Kakashi, your chakra reserves are good, though not massive. Still, you've already met the threshold required to learn Sage Mode. Whether or not you can succeed depends entirely on you."
"Understood, Master Fukasaku. How do I begin?"
"Natural energy is very hard to sense. The first step is to remain completely still."
"Completely still?" Kakashi asked, puzzled.
"Yes, stillness is crucial. You see this brown waterfall? It's coated in the unique toad oil of Myoboku Mountain. This oil will help you sense the natural energy more effectively."
"So, you want me to use the toad oil now?"
"That's right. I'll apply the oil to your body. If you fail to control the natural energy, I'll use this stick to expel it from your body."
Fukasaku then retrieved a large black stick from his side.
"Let's begin, Kakashi."
Kakashi nodded, removing his shirt to reveal his lean, muscular upper body. A red tattoo on his left arm marked him as a member of the ANBU.
"Alright, let's begin. Remember, this requires great patience. Stay focused," Fukasaku warned.
"Don't worry, patience is my strong suit," Kakashi replied, settling into a cross-legged position.
Fukasaku applied the toad oil generously to Kakashi's body.
Kakashi immediately felt a chill as the oil made contact, followed by a strange sensation.
The world around him seemed to fall into perfect stillness, and he could feel a powerful force following the oil, entering his body.
His body seemed to be undergoing strange, yet subtle transformations.
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