Supreme Kai's Gift
Goten extended his arms and gradually levitated.
Rustle...
A rusting sound filled the air as circles of formidable airwaves continuously spread outwards. The ground collapsed in a circle, forming a semicircular crater that reached hundreds of feet deep.
At this point, Goten seemed to have regained his composure, but his eyes were still vacant, the pupils completely vanished. Coupled with the vibrant-green light radiating from his body, he bore a striking resemblance to Broly.
At this time, Shin and Kibito, who were hiding thousands of feet away, were already drenched in cold sweat from fear. The power Goten had just displayed was truly terrifying. Even as gods, they felt a tremendous sense of oppression. They had never experienced this kind of pressure before, not even from Majin Buu.
"Kaiōshin-sama, Goten's pupils disappeared. Has he lost control?" Kibito asked, trembling with fear.
"If that's the case, we might be killed here." It would be too shameful for a supreme god of the universe to be killed in his own realm. More importantly, if a Supreme Kai were to be killed, the world would plunge into chaos.
"Goten-san should be able to control this energy." Shin said, though uncertainty tinged his voice. Goten had warned them earlier that he couldn't guarantee whether he could control the energy after transforming. The disappearance of his pupils at this time made them very scared.
While the two were talking, Goten's figure appeared in front of them like a ghost.
"What... what??" Shin and Kibito were stunned for a moment.
"Kaiōshin-sama, you don't have to be so afraid. I am not out of control," Goten reassured them, a smile playing at the corner of his mouth. As he spoke, pupils slowly emerged from his vacant, pale eyes.
However, the pupils were no longer black as before, nor were they light green like a Super Saiyan's. Instead, they had turned into golden pupils.
It was clear that Goten hadn't lost his mind after fusing with the Legendary Super Saiyan bloodline. He didn't turn into a tool of destruction and killing, like Broly. Instead, he could easily control his own emotions and sanity. This might have something to do with the system.
"That's really… great!" Shin sighed in relief. "It really scared us to death just now…" At this point, they could feel that Goten had returned to normal. His pupils had recovered, and the restless energy in his body had begun to calm down.
"This power is really ridiculously strong," Goten said lightly, clenching his fist and looking at his robust body. "It's much stronger than Super Saiyan II! It's not even comparable." He felt that this form completely surpassed Super Saiyan III, and he could easily overpower Majin Buu. And if he wanted to destroy Majin Buu, the divine power of Ultra Instinct could definitely do it. After feeling the powerful force in his body, Goten also withdrew from the transformation.
"By the way, Goten-san, you are so powerful, I want to give you a gift," Shin said hurriedly after seeing Goten revert to his normal form. "Presumably in this world, only you are worthy of using that thing."
"Kaiōshin-sama, are you talking about the Z Sword?" Kibito asked quickly. There weren't many good things in their God Realm. There weren't many that could match Goten. The treasures of the Sacred Realm of Kai, besides the Time Rings, was the Z Sword.
The Time Rings could only be used by Supreme Kai, and they couldn't be given away casually. That 'Excalibur' had been in their God Realm for a long time, and it was so heavy that neither of them could lift it. Therefore, keeping it in the God Realm was wasting the use of a good tool. If it was given to Goten, it might be able to display the true value of the Z Sword.
"Yes, the Z Sword," Shin confirmed. "Both of us can't handle it anyway, and Goten-san has agreed to help us with Majin Buu. The Z Sword will be even more powerful in the hands of Goten-san!" Rather than giving it to Goten, it would be better to let Goten have that sword to completely eliminate Majin Buu.
"You're right!" Kibito echoed. "Just staying in the God Realm, it really doesn't have much use." After all, neither of them could lift it. Each of the previous Supreme Kais used the Z Sword as a weapon. It was also a good time for the sword to be given to the hero.
"The Z Sword?" Goten asked, intrigued by their conversation. But his interest wasn't in the Z Sword. Because that thing was no longer useful in his hands. And with his current strength, he didn't need any weapons. What interested him was the old Supreme Kai sealed in the Z Sword. Although that old Supreme Kai was wretched and lacked strength, he had an ability that no one else had. It was about being able to help others develop their potential in the body.
Gohan in Dragon Ball Z was a typical example. After his potential was developed, Gohan directly turned into Mystic Gohan, overpowering Majin Buu. That alone was enough to demonstrate just how powerful the old Supreme Kai's ability was. Now that he had fused with the Legendary Super Saiyan bloodline, if his potential could be unlocked by old Supreme Kai, then his basic strength would definitely improve qualitatively. In the future, even if he met a strong person at the level of God of Destruction, he would still have the power to fight. It seemed that developing potential was something that must be done. And right now, in the Sacred Realm of Kai, it was a great opportunity.
"Goten-san, please follow me," Shin said respectfully. "Kaiōshin-sama, just call me Goten from now on!" Goten replied. "After all, you guys are older than me by how many years! And have been calling me sir all the time, and I also feel a little bit awkward." To be honest, he always felt unnatural to be referred to as 'Sir' so respectfully, and he was called that by an old monster who was older than himself.
"Okay… ok! Goten," Shin quickly nodded with a look of emotion. Goten, who was so powerful, was neither arrogant nor impetuous in his interactions, and he didn't have any airs in front of them. One must know that ordinary mortals with this kind of power would have long ruled the universe with great fanfare, calling themselves the emperor of the universe! So Goten's approach naturally moved him immensely.
"Then please come with me!" Then, under the leadership of Shin and Kibito, the three came to a very strange cylindrical mountain. Then they lightly jumped and instantly landed on the top of the mountain. And in the center of the mountain, there was a sword!
"Goten, this is the gift I want to give you - the Z Sword," Shin pointed to the sword inserted in the crack of the stone and said. "This sword is very heavy, and Kibito and I can't move it at all. I think you will be able to use it just fine. And with this sword, your strength will definitely become stronger!"
"Yeah?" Goten smiled, then took hold of the hilt of the Z Sword. He tried it, and it was indeed heavy. It was no wonder Gohan struggled so much with it that he had to transform into a Super Saiyan form in Dragon Ball Z. But now he had been fused with the Legendary Super Saiyan bloodline. Even his basic combat power had already surpassed Gohan, the Super Saiyan at that time. What was more, at that time, Gohan hadn't trained for seven years, and in Vegeta's words, his body had already rusted!
Then Goten's expression suddenly changed. With a strong pull, the whole mountain was shaken in an instant. Cracks also suddenly spread towards the surrounding area.
Clang!
In the next second, Goten easily pulled out the Z Sword amidst Shin and Kibito's expression of shock. He nonchalantly twirled it in one hand, as if it were a mere toy.
Shin's eyes widened in disbelief, his suspicions growing. Was this truly their revered Z Sword? And why did it seem like a child's toy in the hands of Goten?
CREATORS' THOUGHTS 
Clay_Champion
Clay_Champion They author will go different direction here. He didn't go the Mystic Gohan path. He just takes Old Kai's ability as potential unlocked and makes it so that super saiyan transformations are usable on it.
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