Son Goku: Saiyan from Chaldea

Chapter 10: The Fusion Reborn

The radiant sun cast its warm glow over the halls of Chaldea as Ritsuka Gudako delved into her thoughts. The recent battles against formidable foes primarily unknown shadow servants who wielded immense power had stretched her regular Servants to their limits, leaving her yearning for new heights of power. It was during her pursuit of hidden potential that a startling revelation came to light, one from the grail itself. One that told her the mysterious existence of the Grand Archer/Caster, a legendary mix of two classes into one fusion. She instantly knew what she had to do and find out more information about the Saiyans due to the word 'fusion.' 

Ritsuka had once again immersed herself in ancient tomes and forgotten legends, determined to uncover the secrets that lay within. In the midst of her research, she stumbled upon a passage that spoke of an extraordinary fusion. This ascension required the fusion of two of her most powerful Servants: Grand Berserker Vegeta and Grand Foreigner Goku. Through their fusion, a remarkable Grand Archer/Caster Servant known as Gogeta would emerge, embodying the combined might of Goku and Vegeta. Who wrote the information to this? Seriously, Ritsuka needs to hire them for god sakes!

An electric surge of excitement jolted through Ritsuka's veins as she pondered the immense potential of this fusion and the power that could emerge from it. However, she knew that convincing Vegeta to fuse would be no small feat, just getting him to turn into Vegito was hard enough as he had vowed to fuse only once, when he and Goku had become Vegito, and his pride prevented him from embracing the fusion once more so Ritsuka had to somehow convince Vegeta to fuse once more. 

Undeterred by the challenge ahead, Ritsuka resolved to confront Vegeta and probably beg him to fuse. She found him training in a secluded Chaldea training chamber, his muscles rippling with each powerful strike he took fighting a simulation of.. a purple cat? He was losing pretty badly though. 

Ritsuka now taking a deep breath, she mustered her determination and called out to him hoping to succeed in her interaction with him.

"Vegeta, there's something of utmost importance I need to discuss with you!"

 Ritsuka declared, her voice resolute yet also unsettle. 

Vegeta halted his relentless assault upon a training dummy and turned to face her, a mixture of curiosity and scepticism evident in his eyes hoping it isn't anything stupid. 

"What is it, Ritsuka? Can't you see I'm in the midst of my training?"

Ritsuka stepped closer, her gaze unwavering as she met Vegeta's piercing stare. 

"I've made a remarkable discovery, Vegeta. By fusing with Goku once more, we can unlock a new level of power. Together, as Gogeta, you and Goku-sans fusion, we will possess unprecedented strength to face any adversary we come across!"

Vegeta's eyes widened in surprise at her knowledge about Gogeta, but his scepticism remained unyielding.

 "And why do you propose we achieve this fusion? Do you expect us to perform the ludicrous fusion dance once again? I made a promise to myself, and to you, that I would fuse only once, when Kakarot and I became Vegito."

Ritsuka's expression softened, and she cast a pleading gaze upon Vegeta, hoping to kindle a spark of compassion. 

"I understand your reservations, Vegeta, but please consider this: Goku is fervently excited about the prospect of fusing once more. He longs to relive the exhilaration of the battle against Broly, another Saiyan he mentioned that you and he fought having to bring out Gogeta to beat him! and I can't deny my own curiosity at Gogeta's strength! We have faced countless trials together, and this could be our chance to ascend even higher. Besides, I cannot resist my sad puppy eyes because of this chance to get a GSSR!!!."