The Arcane and The Rewrite
"Ren, breakfast is ready!!!" a beautiful woman with white hair and red eyes shouted in a Japanese style mansion,
"Yes Kaa-san," a boy that looked to be around 13 years old said as he started to slowly go down the stairs, he had deep black hair and blue eyes that shone with power,
This was none other than Ren Emiya, the adopted son of Kiritsugu Emiya and Irisveil Von Einzbern, elder brother of Shirou Emiya and Illyasveil Von Einzbern,
It had been a few years since Kiritsugu had convinced Ren into accepting his offer at adoption for him and his brother, he now knew for sure that Shirou was his blood brother thanks to a medical test done by the doctors before the adoption papers were signed,
As soon as Ren got near the kitchen he braced himself on instinct as a white blur hit him,
"good morning Ren-Nii" a cute little girl of 5 years of age shouted to ren while holding him in a grip, this was none other than his adopted sister Illya,
"good morning Illya, where is shirou?" Ren asked to which Illya pouted and said,
"Onii-chan is still in his room, sleeping like a log, he would not even wake up when I tried to!!" she said to which Ren shook his head in amusement, he knew the real reason why Shirou would not wake up early in the morning most of the time,
because he mostly spent his night's training with his magecraft,
It was after Ren and Shirou had agreed for adoption that Kiritsugu informed Ren of the true nature of the fire and about him being a magus, although Ren already knew that thanks to the energy he was giving off called prana,
this was another thing that had changed about Ren, at least that's what he thought as he did not remember much of his previous life before the fire,
It seems that those dreams that he had seen during his rescue were not dreams, but memories, it was from these memories that the lingering personalities had tried to control him during his recovery, but somehow, Ren had managed to destroy those memories and managed to stay as himself, but as a side effect he had lost the specific memories about their identities from those memories, but the information and powers remained with him,
this is why he knew that Kiritsugu was a practitioner of magic, it was because of the smell of a weaker version of arcane energy he was sensing from him, he knew for a fact that he was capable of manipulating the Arcane and performing spells and abilities like the last guardian whose name was lost from his memories, that is why he had asked Kiritsugu to help him train in magecraft which was much more inferior to the magic in his memories, but he needed to training if he wanted to achieve even a fraction of the power that the last guardian once commanded,
But then came another problem, his new mother was strictly against him and his brother from being involved in the supernatural, but a little bit of persuasion from Ren, Kiritsugu and Shirou who also wanted to learn Magecraft, she relented,
Shirou wanted to learn magecraft to protect his new family, while Kiritsugu wanted Ren to learn Magecraft so that he would be able to protect himself from the people of the Clock tower when they learn of his abnormal amount of magic circuits,
at the beginning of the training, Kiritsugu had scanned Ren and Shirou for their element and origin which once again surprised him,
Shirou had the element and origin of Sword, he was an incarnation, while he also had an element of flame, but the biggest surprise was from Ren,
while he had the 5 major elements, an Average one, his two origins remained elusive, no matter how much Kiritsugu tried, he simply could not find nor understand Ren's origins,
since Shirou only had 27 average quality magic circuits, combined with his status as an Incarnation, he had a hard time trying to learn magecraft compared to Ren who took it all in like a sponge, it was during this time that he developed his own brand of magecraft that was based on Structural Grasp
Trace,
this magecraft allowed Shirou to look into the very history of an object, specifically, a bladed weapon, which allows him to understand and mimic the skill of the previous user of the weapon, soon after he developed the spell, he taught it to both his parents and his brother, in the entire family including the two maids, Illya was the only one who was unaware of the Moonlit world,
Ren analyzed the spell and helped his brother to improve it, he suggested his brother use Trace along with a modified version of Gradation air also known as a projection to replicate mystic code,
It worked a little too well,
Shirou had managed to completely replicate a sword mystic code that their father had lying around in his workshop to perfection, but then he took it a step further,
He traced the sacred artifact inside his own body, the ever distant Utopia, Avalon,
the result was a working noble phantasm that was nearly 90% as strong as the original,
This excited Shirou so much that he continued to work on his magecraft every day after that, he found out that although he could theoretically trace any noble phantasm on existence, it took a significant amount of prana to create and they were always degraded by one or two ranks than the original, to remedy this, Ren used his Arcane magic for the very first time,
using the memories from the Last Guardian, Ren created a mystic code that would work as a conduit to his Rewrite power, he created it to look similar to the staff of the Last Guardian, the Atiesh,
he used the staff to focus his Rewrite power on Shirou's magic circuits, reinforcing them permanently,
In the end, Shirou still had his original 27 magic circuits, but now, they were capable of producing prana on par with 100 high-class magic circuits, but this kind of experiment did have its consequence,
Kiritsugu had used his newly learned Trace along with his former techniques to find out that using the Rewrite ability outside of himself had caused Ren to loose 10 years from his total lifespan, confirming Ren's suspicions about the power, it drained the life force of the user to give him a permanent boost of power after he surpasses a certain level of human limit, Ren decided to not use the power much unless it was absolutely necessary, it would be his trump card,
"It is okay Illya, he will soon join us in the breakfast, let's go, I will be late for school," Ren said as he took the still pouting Illya to the kitchen where their loving mother and the maids, Sella and Leysritt were done cooking breakfast with a happy look on their face, Ren could understand their happiness,
Ever since Shirou hit 10 years of age two years ago, he had pretty much conquered the kitchen and refused to let anyone but him cook, fortunately, his concentration on his magecraft as of late had allowed his mother and the maids to cook, but Ren must admit that nothing they make can ever compare to Shirou's cooking,
As the two children ate their breakfast, another boy with auburn hair and golden eyes rushed into the kitchen with his bag in his hands,
"Nii-san why did you not wake me up? you knew I had to help Tohsaka in her studies today morning" the boy shouted to which Ren looked calmly at him and said,
"Illya here had tried to wake you up but since you would not even wake up to her, there was no guaranty you would wake up to me, I guess only Taiga would be able to wake you up in the state you were apparently in," he said as Shirou glared at his brother,
"Shirou eat your breakfast before you go to the Tohsaka's to meet Rin and Sakura," their mother said, Shirou wanted to protest and bolt out of the house immediately to avoid the wrath of the tsundere called as Rin but stopped in his tracks when he sensed the dark aura around his mother, from the corner of his eyes he saw his brother and father who were much stronger than him suppress a shiver, if there was one thing that all the men in this house shared, then it was their collective fear for the woman called Irisveil von Einzbern,
Shirou sighed and sat at the table to eat, imagine the hell that Rin would put him through for being late caused him to cry a little bit while Ren snickered,
His family was so much fun.