The Nephilim in FGO

Prologue

Once upon a time there was a Man and Woman. These, when alive, were deeply in love and could never be taken from each other, but God was cruel. The Man was sent to hell and the Woman, Heaven. When they found out they were depressed that they were separated in death and found it cruel especially when the now Angel found out she couldn't fall. So when they both could they would sneak out to see each other from the eyes of Satan and God. After many years they had a child, but were scared of what would happen if they would be founded out.

So they made sure to hide you before they made a plan, a plan to fake their deaths so they could be with their child. Luckily the plan turned out well and they thought the Man and Woman died, during the time of their fake death they raised the child making sure the child knew of their heritage and made sure they understood how powerful they truly are. After five years the, now parents, had to make sure their child could easily survive the super natural world with ease. So for the next eleven years they made sure to train the child to the bone and make sure he was healthy and could easily get better. Luckily during training they found out about the child regeneration ability, an ability that could let him reform if he was just a drop of blood, and made his training even harder.

During the time the child understood what his parents were doing for him so he made sure to never stop even when he was supposed to take a break. During his fifth year of training he heard a call. This call was from something he didn't understand why he was hearing so he went searching out at night for the voice calling for him. During the time of his searching he kept quiet about it from his parents, making sure they did not know what he was doing because he didn't want to worry his parents. After a year of searching he got the closest he's ever been before, he went searching through a confusing and eccentric cave system.

The voice got louder and louder he got, after several hours of grim and painful searching he had found it. In a rock, covered in vines that had sharp needles that looked like blades, being shined upon he found a sword that he did not know, from what he could tell past the vines, it was a mix of gold and blue. So he went to the sword and tried to pull it from the stone, but he couldn't it wasn't that he was weak it was that he was not ready for the blade just yet so he made sure to write it down in his journal he kept with him and leave to come back for it another day. Ten years later, the boy finally finished his gruesome, but totally worth, training and was able to easily beat Heavenly Dragons with trouble. Looking back into his journal he found some old writing of his about the cave with the sword in the stone. He went back to this cave following his old path to see if he can finally get the sword he couldn't get before.

He finally made it back to the area he once found the sword still there in its confined state. So once again he goes to the handle to pull the sword from the ground and with a tug, it becomes free from its confines and once more has a wielder and master. The boy looks at the sword, realizing it was the legendary sword Excalibur the one said to be lost in legend! In secret for awhile he learned to wield the Excalibur and become a master at wielding said blade, luckily for him the training of his parents taught him how to quickly master anything and he became a master of every blade and weapon known to man. He also during his training made sure to keep up with his magic training learning many spells ranging from E to FORBIDDEN.

One day during some good old relaxation from fighting a dragon god in a spar he was transported to place called Chaldea with knowledge he didn't have before only to ask one question "Are you my Master?".