Righteous and Old Gods, won right off the bat so that's the route you've chosen during your path to becoming the King of Avalon. The alignment you've chosen both in morality and religion will affect not only your character as whole but also themes that will appear during important moments.

I will also be adding little omakes here and there, just to add some fun aside from heavy lifting campaign.

( Narrator P.o.V )

Chaldea

(Y/N) stood still, staring at the lilac girl in front of him. She was so diffrent and he could sense it. She was like a bright light that illuminated the very room even she didn't admit to it. Those little smiles and her constant support for the other girl she's been calling Senpai...

Of course, thanks to his Authority of Avalon, he already knew who was the Heroic Spirit that made the contract with the girl but he also knew that simply saying it wouldn't have the same weight to as discovering it herself. Besides the one she's bonded with always liked adventure and denying her the ability to discover it along the way would not be tasteful nor helpful.

Mash : My King?

(Y/N) : Yes, Shielder?

Mash : You know of all Knights of the Round Table, do you perhaps know who is in contract with me?

(Y/N) : I do, Lilac Knight.

Mash : Then could you tell me? I-I could utilize those powers better if-

(Y/N) : No.

Gudako : Huh? But why? Wouldn't that make her stronger?

(Y/N) : For the moment, yes. However, the road ahead of us is long and perilous. To be able to utilize to those powers she must not only know the name but grow into it and gain confidence in her actions and goals. If I were to reveal the Heroic Spirit, she'd try to grow into them and not into the person she's suppose to be. She must first discover herself.

Gudako : Eh?

(Y/N) : I may not have powers that allow me to predict future but I can already tell that you will find out eventually. What will matter is who will you become along the way.

The two left while (Y/N) was left to sit on his throne. Where was his throne? ...Well, in most populated place in all of Chaldea, the cafeteria. At the moment he was a fresh summon and Grand Order has just started, therefore there were close to none other Servants. He saw Cu Caster on the side along with Hassan of Cursed Arm when Ritsuka first summoned some help.

He often wondred why's she wasting Saint Quartz on some wastes of spaces when Olga already has a contract with him but he was a King, and in the end decided that it would be good if she were to summon many Servants, the more Servants she summons the more people he has rule over and in the end it's also what mattered to him.

He only ever hoped that he won't have to deal with that so called 'King of Heroes', he has heard he's quite a... mongrel, if you will.

He enjoyed his peace and quite while he could, sitting on his throne proudly and dominating the very atmoshpere around him with gaze alone. Almost everyone present in Chaldea wondered where did he get his throne but ultimately decided to not question a giant, dread king that could probably kill them with a wave of his hand.

The only person who could look past all of this...

Leonardo : Yahoo! (Y/N), how about taking off that helmet and letting me paint you?

That is about attempt one hundred at trying to make him remove the helmet and allow them to actually see his face. He hasn't made an attempt at it yet and many people were interested what layed behind that helmet.

(Y/N) : What for? If they wish to gaze upon my glory they may seem in all of my might, right here, on my throne.

Leonardo : Then how about just taking off the helmet to show your face for a bit? Every great ruler has a portrait.

(Y/N) : King Arthur did have a few of them... And there were many statues of him across the kingdom.

Cu Caster : I'm not sure if feeding his ego is a good idea, especially if the golden boy will show up as well.

Hassan : Well, that would be a battle of the ages.

Cu Caster : One that would probably destroy Chaldea.

Leonardo : We wouldn't allow that. Just send them off to some singularity that wouldn't otherwise affect human history and let them deal with it.

(Y/N) : Very well I'll allow you to make a sculpture of me, find the largest material you can find.

Leonardo : The... largest?

(Y/N) : Yes, we shall place it outside Chaldea to let all know who this place truly belong to.

Leonardo : Director?

(Y/N) : Both she and her life in reality belong to me. Had I not shown up she would be dead. Had I not bring her forth from the brink of death with magic of Avalon she'd be dead either way.

Olga : I heard that!

Said girl yelled, hearing everything the Dread King has just said as she was entering the cafeteria at the moment. She stormed all the way to him and pointed an accusing finger at his face.

Olga : You are my Servant! I am the Master!

(Y/N) : I am the dreadful king of magical island filled with human and fae who was personally hand-crafted by the Lady of the Lake to rule it and I think at this point even made her my lover. You are a bratty little girl who didn't want to die because no one said 'well done' to you.

Silence filled the cafeteria as Olga stood there frozen.

Cu Caster : I'll go get some ice.

He up and left, Hassan took another glance and quick followed the mage, leaving only the king and his two subjects.

Olga : YOU! You ungrateful jackass! You're only here thanks to me!

(Y/N) : I could've used the other girl as an anchor to this world. Are YOU not the one being ungrateful? I've saved your soul from eternity of constant dying and then basically ressurected your dead body. I could've used that magic to help one of the USEFUL Masters.

Leonardo : I'll just... schedule myself later...

She left, without making a big deal out of it, trying to get the attention from cold king and fuming Director.

Olga : Then why haven't you?!

(Y/N) : I've asked myself that question... At some point I think I should've but you're useflu for morale at least. Suddenly loosing a person who managed to reign all of it together would certainly leave a vaccum of power and disorganization. I shall see with your actions if I've actually made a good choice.

Olga : Hmph... You're not really as knightly as you make yourself to be, o Once-And-Future King.

(Y/N) : Lest you forgot I'm not like any other knight you've heard or read about. What did you expect, Olga? That after saving you, I'd sweep you off your feet and take you as my princess?

For a second there, (Y/N) was genuinly impressed. She's had both the brighest blush he has ever seen, but he didn't have all that much eperience with woman, and the strongest murderous aura he has felt in a while, which he felt many times from dozens of enemies.

Olga : You are the WORST Servant that could've been summoned! Not like I'd care about that, you edgy king!

She left the cafeteria with a resounding 'HMPH' and even louder slam of the doors. For a second there, he was certain that they will just suddenly fall of their hinges but they held, denying him something to poke at her with.

Ritsuka and Mash just received news from Doctor, a new Singularity has been spotted and they're preparing Rayshifting. They were told to get (Y/N) and prepare for their mission but on their way, they stumbled upon a Wild Director.

Mash : I'm sorry Director, do you know where King (Y/N) is?

Olga : On his dumb, grand chair in cafeteria, that idiot!

Gudako : Oh, seems like they've talked again...

Olga : What about Romani, is he at least being useful?!

Mash : W-We've found a new Singularity, we're on our way to deliever the information to His Majesty.

Olga : Then go and get this king of island in the middle of nowhere to get useful himself! And stop refering to him with such high regard!

Mash : I-I can't...! It's like in the back of my head I know he's my ruler... I can't show any disrespect...

Olga : Just be on your way!

The two ran off, allowing Olga to move on with her warpath. Her next target? Doctor Romani.

Meanwhile the two ran back to cafeteria, only to hear (Y/N)'s chuckling as he still remembered Olga's reaction. She was so easy to tease... So easy to read as well. He was pretty certain that if he were to actually swipe her off her feet she'd instantly give up any and all resistance.

Gudako / Mash : Your Majesty!

(Y/N) : Ah, what is it that you two need?

Gudako : Doctor Romani has found a new Singularity and we're preapring to enter it and take it down.

(Y/N) : Where are we going?

Mash : To France, My King. During the period of Hundred Years War.

(Y/N) : Very well! Off to the lands of Christian Lords! May their sacrifice please the Old Gods!

Watching him get up from his throne felt like watching a titan rise up to it's full height. He left for the Rayshifting room as the two watched him leave. Mash with admiration that such a mighty king is her ruler, while Gudako was just hyped at the fact that they will have help from a person that made a Demon God run off.

With Rayshifting innitating, (Y/N) prepared himself to be moved across time and space. He still saw a glimps of Olga's pouty face whenever he looked at her. Now, amused and prepared he was sent along with the rest to Hundred Years War France.

He looked towards the sky, seeing a giant ring of light. His amusement gone as he watched the very essence that brings the end of humanity.

Gudako : We really are here.

Fou : Fou!

The pet from Chaldea jumped out of Mash's shield and onto the king's shoulder. They both half-expected him to pick up the furry creature and chuck it to who knows where but he simply scratched it's chin, as if listening and understanding what it was talking about.

He was away in his own mind, trying to process what the little beast said as he walked on with his two subject behind him. That is until they were rudely interrupted by French soldiers...

(Y/N) : You dare raise a hand against a king?!

Everyone - Mash and Gudako included - were on their knees when he released his aura, it was as if the air itself forced them to kneel.

Romani : We can't kill anyone from this era, we don't know what kind of changes it might bring.

(Y/N) : Bow your heads to me.

Everyone did as he said and suddenly the pressure was gone. Soldiers picked up their weapons but didn't dare to move from their spot as he walked forward with the two Chaldean girls behind him. Looking at each other, the soldiers re-armed themselves fully and followed the knightly figure.

Mash : Uhm... All hostiles... pacified?

(Y/N) : So it would seem.

Gudako : Getting them to bow before you and making them follow you with your presence alone is kinda cool.

Soldier : My Lord! It seems others are being attacked at the fortifications nearby by... dragons!

(Y/N) climbed atop the nearby hill and glanced at the flying figures trying to get through the spear wall soldiers adapted to protect themselves while doing whatever else they can to gather as much attention from the flying creatures as they could.

(Y/N) : Wyverns. Reinforce those squads, aim for the wings, they're soft and leathery so you can easily wound them and force them to the ground. As I can understand there are civilians inside, so try to stop and monster from getting behind those walls.

Soldiers : Yes, Your Majesty!

Gudako : So commanding!

(Y/N) : You two as well. Ritsuka, you have no combat capabilities but you can boost Mash. Make sure to do your best at protecting any stray civilans, soldiers and taking down occassional wyvern.

Olga : I am the Director, I should be giving commands!

(Y/N) : You're not on a battlefield. Besides I doubt you can respond fast enough, prepare tactic and explain to simple, human soldiers what tactics they should use in a fight against monsters that just a few hours ago were bed time stories. Stay silent, when you're not needed, Princess.

Olga : Don't call me that!

Ignoring her outburst, (Y/N) hefted his sword and with a single swing cut a wyvern vertically in half. He jumped forward and with another swing cut off the wings from one, the after-strike carrying forth and decapitating the one behind it. Soldiers cheered as the changed formation to a wall and started to press forth. The king raised his foot and stomped on the head of the one he just de-winged.

However, their ranks quickly stood back as an actual dragon appeared, it's fire breath scarring the walls, just barely missing the main formation but hurting some of the less fortunate souls.

Jeanne : No need to fear, men! Press forth!

A woman appeared in their ranks, with a bring light the soldiers seemed invigorated but instead of charging into fight they all stare at her.

Soldier #1 : That's the Dragon Witch!

Soldier #2 : Doesn't look like the other one...

Soldier #3 : Let's kill her and be done with this madness!

Jeanne : Please! I understand you think of me as the who's destroying your country and killing your families but we are not the same person! I wish to stop her as well!

Soldier #4 : I stand with her, she helped us against the English!

Soldier #2 : Come on! Regroup into combat formations!

Jeanne : Thank you! Allow me to help you!

Gudako : That's Jeanne D'Arc!

Mash : She's so radiant... No surprise those soldiers just followed her.

Gudako : She can help us understand what's happening in this Singularity! Mash, we need to get to her!

Mash : On it, Senpai! Stay behind me!

The formation of soldiers somehow managed to fight back against the wyverns with Jeanne leading them. The dragon returned, however, letting out a mighty roar and showing all of it's might.

It's moment of glory passed quickly as a red flash of lighting struck and it's head fell off. (Y/N)'s sword placing itself back together as he walked over to the decapitated dragon head and slamming his plated boot against it, sending all wyverns into panic as they bigger and significantly stronger cousin just had it's head lopped off.

Soldiers cheered as their foe ran away. Aside from some burns and initial attack victims there weren't too many wounded or dead. A certain group of soldiers ran over to the king and kneeled in front of him. One was badly wounded, with burn marks on his armor.

(Y/N) : You two, help him to a doctor. Make sure he's well fed and rested. He did well today, sacrificing himself to help a few of his fellow soldiers.

They saluted and helped the man up. Letting him rest on their shoulders as they helped him walk inside the fortifications. Jeanne went to greet the man and check on other soldiers who seemed to treat him like a king of some sort.

Jeanne : It was a very impressive feat of power. But... You're not human. Servant? But your feel is off, it's as if-

(Y/N) : You could say I am above simple Servant capabilities.

Gudako : Jeanne!

Jeanne : Yes, and who might you be?

Gudako : Ritsuka Fujimaru and this is my kouhai, Mashu Kyrielight. We are from Chaldea to help stop this Singularity. We're here along with King (Y/N).

Jeanne : King? It is nice to meet you, Your Majesty.

(Y/N) : Who are you again?

Everyone : Huh?!

Yeah, (Y/N) just doesn't care about people unless they prove their worth or are his subjects...