The Flying Thunder God Technique, a space-time ninjutsu created by the Second Hokage, Tobirama Senju, was so powerful that Tobirama used it to effortlessly defeat Izuna Uchiha, a wielder of the Mangekyo Sharingan.
Though this success partly stemmed from Izuna's lack of familiarity with the technique, creating an element of surprise, the sheer potency of the Flying Thunder God was undeniable.
Yet, aside from Tobirama, no one in Konoha had mastered this technique due to its immense difficulty.
To learn the Flying Thunder God Technique, one first needed a deep understanding of its formula, delving into the mysteries of space itself. Activating the formula enabled instantaneous teleportation.
The formula could be expressed in various forms, as long as its core principles were mastered. For instance, Tobirama used intricate patterns, while Minato employed written seals.
Mastery of spatial manipulation was also essential, as teleportation demanded precise chakra control and significant consumption. A single misstep could trap the user in an unknown spatial dimension.
Thus, practicing the Flying Thunder God was fraught with danger, especially for a lone shinobi.
These factors made the technique accessible only to a select few, arguably just Tobirama and Minato, leaving its exclusivity in question.
"Let's take a look." Tengen said, unfurling the scroll. Written in ninja script, it detailed every aspect of the Flying Thunder God Technique.
After a while, Tengen set the scroll aside.
"This version of the Flying Thunder God has been refined by Minato. It seems he held nothing back." Tengen remarked, closing the scroll.
The scroll revealed the intricacies of the technique, every secret unfolding in Tengen's mind.
Thanks to his extensive ninjutsu experience and the elite Jonin knowledge he'd absorbed, Tengen's understanding of ninjutsu was profound. With his Mangekyo Sharingan granting insight into spatial manipulation, he believed mastering the Flying Thunder God was within his reach.
"However, even getting started with this technique will take time." Tengen mused.
The Flying Thunder God's training was notoriously challenging, particularly the initial phase. It shared some similarities with the Rasengan, though the Rasengan's learning curve was far less steep.
"I'll set it aside for now." Tengen decided, placing the scroll down. Mastering the Flying Thunder God wasn't a task for a single day.
Instead, Tengen turned his attention to the standard Naruto video he'd earned by defeating Kakashi.
"Let's see what this is." he said. The thrill of drawing rewards always excited Tengen, as the outcome was unpredictable, potentially yielding treasures or disappointments.
Higher clarity videos typically offered better rewards, while lower clarity ones were less promising, though there was always a slim chance for an unexpected gem, even with ordinary videos.
"Let's draw it." Tengen commanded, initiating the extraction.
"Ding! Congratulations, you've obtained the Flying Thunder God Technique." the system's voice announced, catching Tengen off guard. Was his luck really this good?
He had just received Minato's scroll for the Flying Thunder God, and now the system awarded him the same technique.
"Absorb it." Tengen said, his eyes glinting.
With such a valuable technique at hand, Tengen didn't hesitate. Having just studied Minato's refined version, he was eager to see how the system's version compared.
A flood of knowledge about the Flying Thunder God surged through Tengen's mind, its secrets, spatial intricacies, and applications unveiled as if a veil had been lifted.
Moments later, Tengen opened his eyes, a faint smile curling his lips.
"So that's how it works." he murmured. He drew a kunai, placing his hand over it. A unique pattern formed, depicting a creature unlike any in the ninja world, a dragon, the totem of an ancient nation from Tengen's former world, a nod to his origins.
"Now." Tengen said, placing a matching seal on the table.
He flung the kunai, which sailed through a window's gap and shot outside.
"Flying Thunder God Technique!" Tengen vanished from the room, reappearing instantly beside the airborne kunai. Grasping it, he glanced back at his house.
"Truly instantaneous, a unique application of space." Tengen said with a smile.
With a step, he melded into space again, reappearing at the seal on the table.
"Compared to Minato's version, this is significantly enhanced. Is this the system's optimization?" Tengen chuckled.
The system's version surpassed Minato's in execution, precautions, and chakra efficiency by a wide margin.
This was the system's power.
While the Flying Thunder God was an extraordinary technique, it was merely a sophisticated use of spatial overlap, akin to folding two sheets of paper together.
In some worlds, spatial manipulation reached far greater heights. Though often confined to fiction, such worlds might exist in their own dimensions.
Compared to beings in fictional universes like Dragon Ball, capable of obliterating stars or galaxies with a single attack, or entities like Shenron spanning entire universes, the Naruto world's power seemed modest.
The disparity in power levels was vast.
"Still, I'll need to craft specialized kunai with embedded seals for greater stability." Tengen reflected.
Forging weapons inscribed with the technique's formula was a critical step.
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