I. Consequences in the Guild
The return to Fairy Tail was discreet. Master Makarov was already aware of the situation and, after hearing the accounts of Erza and Akiha, his small face became grave.
Makarov: "'Harmonic Domination.' No matter how outlandish it sounds, if it has the capacity to rip someone like Goku out of his own dimension, it is an S-Level threat to the existence of all guilds." Makarov said, sitting in his giant cup.
Erza and Akiha stood before him, with Goku devouring a refrigerator full of nearby pastries.
Akiha (Holding her dimensional tablet): "The fight in Hakobe taught us two important things. First, the enemy now knows that Goku can be contained and that he can destroy their nexus points. Second, and more crucial, is that Goku cannot transform or use his full power without destroying our world."
Erza: "Exactly. We need Goku to learn how to fight in this world. Not just to contain his Ki, but to integrate the concept of Magic into his style, so he can defend himself without flattening a city."
Makarov nodded, looking at Goku, who for the first time seemed thoughtful between bites.
Erza: "The problem, Master, is that there is no one in Fiore with the necessary control or strength to train Goku. His Ki is too dense. No one can be his sparring partner."
Goku raised his hand.
Goku: "Hey, what if I just use weights?"
Akiha shook her head.
Akiha: "In your world, yes. But the gravity and mass of this planet are different. We need a place where there is no civilization to protect."
Makarov smiled shrewdly, raising his finger.
Makarov: "There is a place. It is called Tenrou Island. It is the sacred ground of Fairy Tail. It is isolated, full of powerful monsters for training, and most importantly, its magical barrier is so strong that it could dampen a low-level Ki explosion."
II. The First Day of Class
The trip to Tenrou Island was quick, using one of the guild's magic ships. When they arrived, Goku immediately felt energized by the dense and pure concentration of Etherano.
Goku: "Wow, I like this place! It feels like the air back home!" Goku exclaimed, leaping into the air.
Akiha halted Goku's enthusiasm.
Akiha: "Listen, this isn't just a hideout; it's your Containment Dojo. You're not going to increase your strength; you're going to increase your control."
Erza (Pointing to a giant stone pillar jutting out of the jungle): "Your first task will be to destroy only the highest point of the pillar. Not the entire pillar."
Goku focused his Ki. A golden aura flickered around him. He launched a small energy blast. He missed by a meter and pulverized a tree a hundred meters away.
Goku: "Oops!" Goku laughed, scratching his head.
Akiha sighed, activating her strategist mode.
Akiha: "Error. Your Ki energy is too volatile. We need a different approach. You need to link your Ki to something local, something that attenuates it."
III. The Seal of the Steel Lady
Erza Re-Equipped into her Adamantine Armor, the most resistant of all her armors, and stood in front of Goku.
Erza: "I will be your sparring partner. I cannot match your strength, but I can absorb and deflect some of it. But I will only face you if you use the Ki level you used for the 'Precision Kamehameha.' I will teach you how to fight with absolute precision."
Goku was fascinated.
Goku: "But if I hit you, I'll hurt you!"
Erza: "Do not underestimate me," Erza said, with a steel gaze that admitted no debate.
Akiha intervened with her device, which emitted a blue glow.
Akiha: "I will use the Field Attenuator from my realm. If your Ki passes a certain threshold, this thing will deflect it, redirecting the excess energy to the atmosphere."
While Akiha installed the device, Erza approached Goku.
Erza: "Watch my movements, Goku. In this world, we don't use the brute force of Ki for every attack; we use the Ether Chain, which is like an internal flow. When I move you, it's not the force, but the balance."
Erza struck him with an open hand to the stomach. Goku barely flinched, but he felt the movement of his center of gravity.
Erza: "Don't move by force. Move by intention, by the cut," Erza said, demonstrating a sword movement.
IV. The Training on the Island
The training began. It was a ridiculous sight: the interdimensional Master Duelist Akiha sitting on a rock, observing data on her tablet, while Erza, the Steel Lady, challenged the strongest Saiyan.
Goku, for the first time in years, was not training to be stronger, but to be more subtle. He tried to hit Erza, but every blow was too powerful, and Erza, using her Adamantine Armor, barely deflected it with impeccable technique.
Erza: "Softer, Goku! Concentrate the energy in your fist, not in the aura!" Erza shouted, dodging a blow that would have flattened a house.
Akiha, noticing the slow progress, stood up.
Akiha: "Goku. Instead of striking with Ki, try to wrap your fist in a protective layer of Ki, like an invisible armor. The force must come from your muscles, not the energy."
Goku tried. This time, when he struck, the air didn't break. Instead, Goku's fist collided with Erza's Adamantine Armor.
BOOM!
The shockwave caused the surrounding forest to bend. Erza flew backward, but the damage to her armor was minimal. She stood up, panting.
Erza: "You did it, Goku! That blow was pure physical strength, not uncontrolled Ki! That was the first lesson!" Erza said, feeling a strange pride in the Saiyan.
Goku was ecstatic.
Goku: "Yeah! That was fun! What's next?"
Akiha smiled, putting away her tablet.
Akiha: "Now, the second part. Learn to fly without being seen. If someone tracks you, it doesn't matter how strong you are."
The training on Tenrou Island, under the tutelage of his two new companions, had begun. The dimensional key was adapting to its new lock.