Sixteen years before the fateful Tournament of Power, Kus, the angelic attendant of Universe 10, and Ruumosh, the God of Destruction, were leisurely traversing through the vast expanse of their domain. The ethereal realm was a kaleidoscope of celestial wonders, with swirling nebulae and gleaming stars stretching out into infinity.

Kus, her silvery hair flowing behind her, turned to Ruumosh with a playful smile. "It's good to see you destroy a couple planets every now and then, Lord Ruumosh. It keeps the balance in check."

Ruumosh, a hulking figure with a trunk-like nose and crimson skin, let out an exasperated sigh. "It's a real hassle, Kus. But at the end of the day, it's my job. The work of a God of Destruction is never done."

Suddenly, Kus halted in mid-flight, her brows furrowing in curiosity. Ruumosh, noticing her abrupt stop, floated over to her side. "What is it, Kus? Why did we stop?"

Kus pointed a slender finger ahead. "Look over there, Lord Ruumosh. Do you see that?"

Ruumosh squinted his eyes, peering into the distance. There, amidst the glittering tapestry of the cosmos, was a small, spherical object. It was a pure white color, contrasting starkly against the inky blackness of space. As they drew closer, they realized it was a miniature spaceship, no larger than a Car.

"It appears to be stranded," Kus observed, her melodic voice tinged with concern. "Perhaps we should investigate."

Ruumosh grumbled, his stomach letting out a loud rumble. "I suppose so. But let's make it quick. I'm starving and eager to return to the planet for a feast."

Kus nodded in agreement and gracefully glided towards the peculiar vessel. As she approached, she peered through the translucent window, her eyes widening in surprise. Inside, nestled in a cozy cradle, was a tiny, slumbering infant.

"Lord Ruumosh, it's a baby!" Kus exclaimed, her voice filled with wonder. "A little one, all alone in this vast universe."

Ruumosh rolled his eyes, his patience wearing thin. "Yes, well, let's just toss it back into space or something. We have more important matters to attend to, like sating my hunger."

But Kus, her nurturing instincts taking over, had already gently scooped up the space pod. "We can't just leave the child here, Lord Ruumosh. It wouldn't be right."

With a wave of her hand, Kus created a shimmering portal, and they entered, emerging on the lush, verdant fields of their home planet. The grass swayed in the gentle breeze, and the sun cast a warm glow upon the tranquil landscape.

Kus delicately placed the space pod on the soft grass, and with a soft hiss, the hatch opened, revealing the sleeping infant within. As Kus reached in to lift the child, she noticed a peculiar feature - a furry, brown tail.

"Look, Lord Ruumosh!" Kus gasped, cradling the baby in her arms. "This little one has a tail. It's a Saiyan!"

Ruumosh arched an eyebrow, his confusion evident. "A what now?"

Kus smiled, her eyes sparkling with excitement. "A Saiyan, Lord Ruumosh. They are a warrior race hailing from Universe 6 and 7. I wonder what this little one was doing all the way out here in Universe 10."

Ruumosh scoffed, waving his hand dismissively. "I don't care where it came from. Just toss it back into space or something. I don't want it causing any trouble here."

But Kus, her maternal instincts in full force, held the baby closer to her chest. "Lord Ruumosh, that would be cruel. We can't just abandon a helpless infant."

Ruumosh, his patience at its limit, reached out to grab the baby. "Fine, I'll throw it back into space myself."

However, as soon as his fingers touched the child, the little Saiyan's eyes snapped open, and with a mischievous glint, it sank its tiny teeth into Ruumosh's trunk-like nose.

"YEOWCH!" Ruumosh bellowed, releasing his grip on the baby and stumbling backward. "Why you little..."

Kus couldn't help but chuckle as she caught the giggling infant. "It seems this little one is from Universe 7. Saiyans from that universe are known for their aggressive nature, even at a young age."

Ruumosh rubbed his sore nose, glaring at the baby. "Then contact your brother Whis and have him take this troublemaker away. I don't have time for this nonsense."

Kus tilted her head, a playful idea forming in her mind. "But Lord Ruumosh, wouldn't it be fun to keep the baby here? Imagine the possibilities!"

Ruumosh scoffed. "And what exactly would be the point of that?"

Kus's eyes sparkled with excitement. "This little Saiyan could become a warrior for our universe - our very own champion! Someone to represent and protect Universe 10."

Ruumosh stroked his chin thoughtfully. "I suppose that could work. It would mean less work for me in the long run."

Kus grinned, bouncing the baby gently in her arms. "Did you hear that, little one? You're going to be trained by none other than a God of Destruction himself!"

Ruumosh quickly held up his hands in protest. "Oh no, count me out. I'm not going to waste my time training some snot-nosed brat. That responsibility falls on you, Kus."

Kus simply smiled, unfazed by Ruumosh's reluctance. She gazed down at the baby, who was now cooing happily in her arms. "Very well, Lord Ruumosh. I accept the challenge. This little Saiyan will grow up to be a magnificent warrior under my guidance."

Ruumosh let out a resigned sigh. "Fine, fine. But don't come crying to me when the kid starts causing trouble." He paused for a moment before asking, "So, what are you going to name the little runt?"

Kus pondered for a moment, her brows furrowed in concentration. "Hmm, it should be a name befitting a Saiyan warrior. Something strong and bold..." Her eyes lit up as an idea struck her. "I've got it! We shall call him Nasu!"

Ruumosh shrugged, indifferent to the choice. "Nasu, huh? I guess it'll do."

Kus lifted Nasu up, gazing into his curious eyes. "Welcome to Universe 10, little Nasu. I hope you won't turn out to be as lazy as Lord Ruumosh here."

.....

Sixteen years had passed since the fateful day when Nasu, the Saiyan infant, arrived in Universe 10. The once tiny baby had grown into a formidable warrior, his potential realized under the watchful guidance of Kus, the angelic attendant.

Ruumosh, the God of Destruction, was lounging on a plush chair, indulging in a midday nap. His snores echoed through the tranquil atmosphere, a testament to his carefree nature. Kus, ever diligent, approached him and gently roused him from his slumber.

"Lord Ruumosh," Kus said, her melodic voice tinged with a hint of reproach. "Shouldn't you be out destroying a planet or something?"

Ruumosh yawned, stretching his muscular arms above his head. "It's such a hassle, Kus. I asked Nasu to take care of it for me."

Kus raised an eyebrow, her expression a mix of surprise and disapproval. "But Nasu isn't even a candidate for the position of God of Destruction. Why is he doing your job?"

Ruumosh shrugged, a mischievous grin spreading across his face. "The kid loves destroying things and fighting. It's a win-win situation if you ask me."

Kus sighed, her patience wearing thin. "Actually, that's precisely what I wanted to talk to you about. Nasu is seventeen now, and his body has finally finished developing. He's ready for proper training, but with his current attitude, he'll never be able to master Ultra Instinct."

Ruumosh waved his hand dismissively. "And what does that have to do with me?"

Kus fixed him with a stern gaze. "Well, you're the one responsible for his behavior, encouraging him to be arrogant and seek power through force. Are you planning to teach him the doctrine of Ultra Ego?"

Ruumosh scoffed, leaning back in his chair. "I told you, I'm not going to train him. Besides, I don't want a successor. I still have thousands of years ahead of me."

Kus merely sighed in resignation, knowing that arguing with Ruumosh was an exercise in futility.

Suddenly, a figure descended from the sky, landing gracefully before them. It was Nasu, the Saiyan prodigy. He stood tall and proud, his short black hair tousled by the wind. His onyx eyes gleamed with an intense fire, a testament to his Saiyan heritage. Nasu's tail, a symbol of his race, swayed behind him, a reminder of his otherworldly origins. He was clad in a navy blue combat suit, his muscles rippling beneath the tight fabric.

"I'm back," Nasu announced, his voice dripping with confidence.

Ruumosh grinned, his eyes sparkling with amusement. "Seems like you had fun out there."

Nasu shrugged, a hint of disappointment in his tone. "Not really. In these past sixteen years, I haven't found a single worthy opponent. Someone who can push me to my limits."

Ruumosh chuckled, his laughter booming across the landscape. "Of course not, kid. You've been trained by the gods themselves. It's unlikely anyone will surpass you."

Nasu's eyes narrowed, a mischievous glint dancing within them. "I've been thinking, maybe it's time I challenge one of the Gods of Destruction. What do you say?"

Ruumosh's expression darkened, his tone sharp and filled with annoyance. "What the hell are you talking about?"

Nasu explained, his voice steady and determined. "I've reached a point where my strength has plateaued. I need to fight, to test my limits."

Kus nodded, a knowing smile on her lips. "That's the Saiyan nature for you."

Ruumosh stood up, his imposing figure towering over Nasu. "Listen here, you brat. You're still light-years away from being on the same level as any of us. Stop spouting nonsense."

Nasu smirked, his eyes gleaming with defiance. "Oh? Are you afraid, old man? Afraid that I might take your place?"

Ruumosh's anger flared, a purple energy ball materializing in his palm. It was a Hakai, the destructive power of a God of Destruction. "It seems I need to put you in your place," he growled.

Nasu's grin only widened, his body tensing with anticipation. "Let's dance, old timer."

The tension was palpable, the air crackling with the intensity of their confrontation. However, their standoff was interrupted by the arrival of Gowasu, the Supreme Kai of Universe 10. The elderly Shinjin, with his green skin and white hair, approached them, his brows furrowed in concern.

"What's with all the commotion?" Gowasu inquired, his voice laced with authority.

Kus replied calmly, her eyes never leaving Ruumosh and Nasu. "Lord Ruumosh wants to destroy Nasu."

Gowasu sighed, exasperation evident in his tone. "Again?"

Their conversation was abruptly cut short by the appearance of a shimmering portal. From within its depths, the Grand Priest emerged, his presence commanding immediate respect. Ruumosh and Gowasu quickly dropped to their knees, their heads bowed in reverence.

Kus greeted her father with a warm smile. "Welcome, Father. To what do we owe the pleasure of your visit?"

Nasu, ever the audacious one, grinned and exclaimed, "Grandpa! What brings you here?"

Ruumosh muttered under his breath, "That disrespectful little idiot."

The Grand Priest chuckled, his eyes twinkling with amusement. "I come bearing a cordial invitation to our upcoming Tournament of Power."

Nasu raised an eyebrow, curiosity piqued. "Tournament?"

The Grand Priest nodded, his voice calm and measured. "Yes, Zeno-sama will gather the ten strongest warriors from each universe to compete."

Ruumosh's brow furrowed, suspicion evident in his tone. "And what's the purpose of this tournament?"

The Grand Priest's expression grew solemn. "I will provide more details in three hours. There will be public exhibition matches between Universe 9 and Universe 7."

Nasu's intuition kicked in, his eyes narrowing. "There's more to this than meets the eye, isn't there, Grandpa?"

The Grand Priest sighed, a hint of resignation in his voice. "I wanted to keep it a secret, but it seems your intuition has only grown sharper, little Nasu."

Nasu blushed, a tinge of embarrassment coloring his cheeks. "I'm not little anymore," he mumbled.

The Grand Priest's tone turned grave. "Please keep this information confidential, but... only one universe will survive."

Nasu's eyes widened in shock. "What?"

Ruumosh's nervous energy was palpable. "Is that true?"

The Grand Priest nodded solemnly. "I will provide more details later. Until then, farewell." With those parting words, he disappeared through the portal once more.

Ruumosh paced back and forth, his mind racing. "What a predicament. Why would Zeno-sama suddenly decide on such a thing?"

Kus turned to Ruumosh, a sly smile playing on her lips. "Well, Lord Ruumosh, do you still want to eliminate our strongest warrior?"

Ruumosh grumbled under his breath before facing Nasu. "Listen up, you little brat. You better win that stupid tournament."

Nasu grinned, his confidence unwavering. "What are you talking about? I'm the strongest among mortals. I'm invincible."

Kus chuckled, her eyes filled with warmth. "Don't worry, I'll make sure to train you well before the tournament. For now, let's wait for the Grand Priest's return."

Gowasu sighed, a tinge of sadness in his voice. "Zamasu would have been a great help. It's a shame he turned to the dark side."

Nasu's curiosity piqued. "Oh, that's right. What happened to him?"

Gowasu explained, his voice tinged with regret. "Apparently, he turned evil in the future and assassinated me. He also tormented a planet in Universe 7. However, Lord Beerus and someone named Son Goku intervened and defeated him."

Kus tilted her head, a questioning look in her eyes. "Did Chronoa inform them?"

Gowasu shrugged, uncertainty evident in his posture. "No idea. They didn't provide many details."

Nasu's brow furrowed in confusion. "Chronoa?"

Kus smiled, her eyes distant with memories. "She's the Supreme Kai of Time and a dear friend of mine. You met her when you were very young, but you might not remember."

Nasu's mind raced with questions, his curiosity piqued by the mention of this mysterious figure from his past. He turned to Kus, his eyes filled with a mixture of excitement and uncertainty.

As the allotted time passed, the team from Universe 10 traveled to the Palace of the Omni-King for the Zen Exhibition Match. Upon their arrival, they encountered the representatives from the other universes, including the fierce warriors from Universe 9 and the formidable team from Universe 7.

The Grand Priest summoned everyone to the arena, where the gods of the 12 universes and both Zen-Oh were already present. The atmosphere was thick with anticipation and tension as the Grand Priest began to explain the significance of these exhibition matches.

"It is of utmost importance that these fights please Zen-Oh sama," the Grand Priest announced, his voice resonating through the arena. "The fate of the Tournament of Power rests upon his satisfaction with these matches."

Suddenly, a man with spiky black hair and a confident grin stepped forward. "Hey, little Zen-Oh! I hope you enjoy the show!" he shouted, causing a wave of indignation to ripple through the gathered deities.

Nasu, intrigued by the brazen warrior, turned to Kus. "Who's that amusing guy?" he asked, a smirk playing on his lips.

Kus, her eyes fixed on the warrior, replied, "I'm not certain of his name, but did you know he's also a Saiyan? You originally hail from Universe 7, Nasu."

Nasu's eyes widened in surprise. "Oh, really? Well, let's see how strong these guys are," he said, his gaze flickering with excitement.

The Grand Priest called forth the first combatants, Basil from Universe 9 and Majin Buu from Universe 7. Nasu watched intently as the battle unfolded, analyzing Majin Buu's strength and techniques. The fight was intense, showcasing the unique abilities of both warriors.

Next up was the match between Gohan and Lavenda. Nasu observed the battle closely, his brows furrowed in concentration. As the fight concluded, the Grand Priest commented on Zen-Oh's satisfaction with the performances of the warriors from the lower-ranked universes, leaving several deities stunned by the revelation.

The Grand Priest then proceeded to explain the true nature of the Tournament of Power. He revealed that Zen-Oh had already evaluated the level of all the universes and that the destruction of the lower-ranked ones had been predetermined. The tournament was merely a special occasion to carry out this task. Furthermore, he announced that the four universes with the highest mortal level would be exempt from participating in the tournament and spared from destruction. The gods of the losing universes would be erased along with their respective realms, with the exception of the angel attendants.

As the shocking announcement sank in, the Grand Priest called forth the next fighters: Goku from Universe 7 and Bergamo from Universe 9.

Nasu turned to Kus, his curiosity piqued. "Hey Kus, is that Gohan guy a Saiyan too?"

Kus nodded. "It appears so."

Nasu scoffed, a hint of disdain in his voice. "Hmph, it's a shame he tied with that weakling wolf."

Kus, her tone patient and wise, explained, "Originally, Saiyans aren't inherently strong. However, it seems that Gohan is an exception, and likely that Son Goku as well. Your strength, Nasu, is a result of your unique training."

As the battle between Goku and Bergamo commenced, the two fighters exchanged blows without gaining a clear advantage over each other. However, Bergamo revealed his ability to absorb the strength of his opponent through the hits he received, allowing him to increase in size.

Goku, undeterred, transformed into his Super Saiyan form and relentlessly pummeled Bergamo. Despite the repeated strikes, Bergamo continued to grow, his body expanding to a considerably large size. Bergamo boasted about his unique ability, but Goku simply smiled, unfazed by the challenge.

In a shocking display of power, Goku transformed once more, this time into his Super Saiyan Blue form. The divine energy emanating from him left the observing deities in awe, their eyes wide with disbelief.

Nasu, his voice filled with excitement, turned to Kus. "Hey Kus, what's that transformation? I can't sense his Ki."

Kus, her brows furrowed in contemplation, replied, "I'm not entirely sure about the details, but it seems he possesses divine Ki."

Nasu's jaw dropped, his eyes wide with astonishment. "What? Divine? This guy is way more impressive than that weakling Gohan."

Swallowing hard, Nasu posed a question that had been nagging at his mind. "Tell me, Kus, between Son Goku and myself, who do you think is stronger?"

Kus, her gaze thoughtful, answered honestly. "Well, if I'm being sincere, I'm uncertain of Son Goku's maximum power. But if I had to make a guess... I would say Son Goku."

Nasu's expression darkened, a mixture of disbelief and determination etched on his face. "What did you say?"

As the match concluded and Zen-Oh and Future Zen-Oh expressed their satisfaction, the Grand Priest proceeded to explain the format of the Tournament of Power. However, before he could finish, a hooded warrior accompanying the deities of Universe 11 leaped onto the battlefield, challenging Goku to a fight.

The mysterious warrior declared that Goku represented the very essence of evil and that as a warrior of justice, it was his duty to eliminate him. His name was Toppo.

The Grand Priest turned to Zen-Oh, seeking permission for the impromptu match. But before a decision could be made, Nasu's voice rang out across the arena.

"WAIT!" Nasu shouted, his tone commanding attention.

Ruumosh, alarmed by Nasu's outburst, hissed, "Hey, kid, keep quiet!"

But it was too late. Nasu had already jumped onto the platform, his eyes blazing with determination. "Son Goku has fought enough. Let me take on the mustache guy."

Toppo, his gaze stern, replied, "I have no business with you, warrior of Universe 10."

Nasu, a mischievous grin spreading across his face, said, "You're a candidate for the God of Destruction, right? This should be fun."

One of the Zenos turned to the other, curiosity in his voice. "Who is that boy?"

The other Zeno smiled, recognition dawning on his face. "Ah, that's little Nasu, Kus's baby!"

Nasu sighed, a hint of exasperation in his voice. "I'm not a child anymore."

The Grand Priest, seeking Zen-Oh's approval, asked, "Well, Zen-Oh sama, should we allow Nasu to fight?"

One of the Zenos, excitement evident in his tone, replied, "Yes! I want to see how strong Kus's baby has become!"

The Grand Priest nodded. "Very well. The match between Nasu and Toppo is permitted."

Goku, a hint of disappointment in his voice, said, "Aw, that's a shame. I wanted to fight that guy."

But then, noticing Nasu's tail, Goku's eyes widened with curiosity. "Hey, you're a Saiyan too?"

Nasu grinned, his pride evident. "That's right, old man."

Goku, his excitement growing, said, "You look really strong. Let's face each other in the tournament!"

Nasu nodded, his eyes gleaming with anticipation. "You can count on it. And maybe you can teach me that Super Saiyan Blue technique."

Goku, his smile widening, replied, "Sure thing! And in return, show me your full power in this fight."

As Goku flew back to the stands, Nasu turned his attention to Toppo, his gaze challenging. "Alright, mustache, show me the power of a God of Destruction."

In the stands, Vermoud, the God of Destruction of Universe 11, turned to his angel attendant. "Hey, Marcarita, who is that brat?"

Marcarita, a smile playing on her lips, replied, "Oh, that's little Nasu, Kus's disciple."

Vermoud, his brows furrowed in concern, thought to himself, "A disciple, huh? He could be a real headache."

Raising his voice, Vermoud shouted to Toppo, "Listen up, Toppo! Give it your all and defeat him. Don't underestimate the kid."

Toppo nodded, his stance firm and determined. "Show me your strength, Nasu, warrior of Universe 10."

Nasu, a confident smirk on his face, assumed his own fighting stance. "Alright, mustache, try to keep up with me."