The reverberation of Father Mountain's energy still hummed through Jiraiya's bones as he left the ancient cavern. He was no longer just the young wanderer with memories of another world; he was a conduit, a receiver of the island's latent force, a bearer of the pact with a Titan ancestor. The change was profound, not only in the torrent of energy he now felt flowing beneath his skin with unprecedented potency, but also in the weight of the purpose that the cosmic entity and Father Mountain had bestowed upon him.
He needed to train. He needed to learn to control this new power, to fuse it with the arsenal of shinobi skills etched into his memory as a Sannin. He found a desolate, remote valley deep in the mountains, a place scarred by the destruction of some past titanic clash, where the island's energy seethed with feverish intensity. This would be his new dojo.
He started with the basics. He tried to mold the energy to perform the fundamental chakra control exercises he taught the genin. Walking through trees was now instinctive, his feet clinging to the vertical surfaces not just with energy, but with a palpable resonance with the giant tree's own wood. Walking on water was still a different challenge; the primordial energy seemed to want to interact with the water explosively rather than simply repel it, creating tiny shock waves or causing the water to boil in miniature if he wasn't careful.
His main focus was the fusion of his signature jutsus with the island's energy. The Rasengan was his first project. He concentrated energy in his palm, but this time it wasn't just chakra. It was the wild energy, the force of the earth and air of this world, channeled through his expanded energy pathways. The sphere that formed was larger than a normal Rasengan, a glowing amber flecked with green, spinning with chaotic power. Maintaining its shape required immense mental focus; the energy wanted to dissipate in an uncontrolled explosion.
"Control, control!" he muttered, sweat beading his forehead. He remembered Naruto's frustrations on his first attempts, but this was different. It wasn't a lack of skill, but the very nature of the energy: untamable, primal.
After countless attempts, failures that left small, smoking craters and fatigued muscles, he achieved a stable version. The "Primordial Rasengan" was smaller than the unstable one, but pulsed with restrained power. Upon impact, it not only eroded the target but released a forceful energy wave that resonated with the force of a small tremor.
He experimented with elemental jutsus. When attempting a Katon (Fire Style), instead of normal flames, the energy infused with the island's telluric power produced bursts of intense heat and molten rock that shot out. It was less of a "flame" and more of a miniature "eruption." Doton (Earth Style) became formidable; by channeling the energy through the ground, he could raise larger rock pillars faster, or create deep pits with a simple strike on the ground. The island's energy resonated strongly with the earth element, making these jutsus particularly potent.
The infusion of energy into his taijutsu became a natural extension of his body. Every punch, every kick, could be imbued with a pulse of savage energy. This allowed him to deliver blows with force far surpassing that of a human, even one as strong as himself. His speed and agility were also enhanced, allowing him to move with superhuman explosiveness and fluidity. It was a form of "Sage Mode" without the need for immobility or constant absorption of the environment, a power always available, though the full scale of Father Mountain required deliberate focus.
His sensory abilities, enhanced by the pact, expanded dramatically. He could now sense the deep energy currents of the Hollow Earth, the subterranean movement of geological faults, and, with eerie clarity, the presence and energetic nature of other Titans, even at great distances. It was as if the entire island were an organism of which he was now a sensory extension. This ability was invaluable for predicting dangers and seeking out other beings relevant to his purpose.
The training was grueling. Channeling primordial energy through a body still adapting, even with the Sannin's muscle memory, tested his limits. There were times when the energy overwhelmed him, causing pain or leaving him temporarily exhausted. But the determination forged through a lifetime of hardship, and the knowledge of his mission, drove him on.
His "research" mind also found new avenues. The very interaction of the island's energy with the biology of the giant creatures was a fascinating field. How did the energy relate to their massive growth, their longevity (if they had any), their unique abilities? Observing the energy patterns in different beasts became a new form of "research," though less tied to his perverted interests and more to his need to understand his new world.
However, the perversion, a force of nature in itself in Jiraiya's case, did not completely disappear. Occasionally, as he felt the island's immense power and vitality flowing through him, especially during moments of great concentration of life energy (such as near lush waterfalls or massive flower formations), an unwelcome association with the "life energy" of youth or the "exuberance" of nature would cause him to let out a hoarse laugh and an inappropriate internal comment. It was a reminder of who he fundamentally was, even in this new, epic context.
As he mastered the fundamentals of this energy fusion, Jiraiya began developing unique techniques that combined the best of both worlds. An "Earth Palm Burst" that not only struck hard but also unleashed a wave of seismic energy. A "Primordial Canopy Leap" that allowed him to ascend great distances with a pulse of energy.
Jiraiya hadn't reached the power level of an adult Titan, but he was no longer the vulnerable young man who had awakened in the jungle. He was a formidable warrior, an "Agent" with growing control over the island's energy and an arsenal of techniques that were a synthesis of shinobi legacy and primordial power. He carried with him the shadow of Father Mountain, the wisdom of the Olwatu and the Aethel, and Jiraiya's unyielding perversion. He was ready to face whatever the "Darkness" stirring in Hollow Earth could throw at him and at this world that he now felt, in a very real way, as his own.
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