Romani Archaman, the current acting director of Chaldea couldn't believe his eyes when he saw the video feedback on what seems to be ten servants, or so do he thought was currently saving as many Chaldea's staffs as they can. Eight males were clearly from the knight categories, a caster, three archer and four saber class servant, whilst the last two female servants with them was a caster and an extra class servant.
The display of power the ten individual shown was astounding despite they were not in battlefield. Especially the two casters. They seem to be controlling every element existed on earth and it intriguing him the most. Well, more on the female caster that is.
Romani watches as the said caster chanted a spell before a surged of electricity suddenly spread from under her to the surrounding. Though he was watching through a camera together with the control room staffs, they could hear the muffled sound of explosions around them and felt the tiny surged of electricity flowing freely around them.
Whomever the masters were, they'd a had ordered their servants to help Chaldea in her current situation. They would also be powerful enough to support such high class servants like the female caster.
But then again it strange though, he, was once as Solomon had once been in the throne of heroes. He had never saw the caster or the knights and extra class at the throne. Maybe they were heroes of long forgotten legend. But if that's the case, their presences should be still exist and recorded in the throne... or maybe they are coming from the sister thrones to the throne of heroes.
Chaldea began to regained its power back once the explosion stops. That causes the head medic to speculated that the caster had directed the energy to the facility's generator after destroying the bombs. Just who on earth was she to be able to yield such power?
Then, the female caster suddenly disappeared into a sparked of rainbow coloured flame. From the corner of his eyes, Romani could also see the other servants disappeared the same way the caster did, only they were in various but singular coloured flame which were mostly blue, yellow and indigo. However, two of the servants, the female extra class and one of the male saber disappeared into orange flames, that recorded impossible reading of mana second to the caster.
A second later, the head medic could felt the spiked of pure magic behind him. He didn't felt any malice, just warmth, tranquillity, acceptation, protectiveness, and unknown strength. He, together with everyone in the room turned to see the three of the supposed servants stand near the entrance. A soft smile adorned the female caster's expression while the two knights besides her remains stoic, making her look like an unearthly being. Then again, they are servants after all, heroes of the past.
"Be at peace. We are send here to help Chaldea in her mission," the caster said in soft, almost musical voice filled with authority. Romani himself could feel the power radiated from the woman making him think that... could she be on an equal lever with him as Solomon?
Stilling himself, the head medic stood to face the three before saying his gratitude, "Thank you for saving some of our staff members. Though I must ask, who is your master?" That question causes the woman to burst out into a fit of giggles, while the two man besides her seemingly holding in their amusement. This causes Romani to brushed in in embarrassment, wondering if he had asked something wrong. But he had to admit her laughter sounded like an enchanted bell.
After a few minutes, the woman calmed herself down before faced them. Taking the side of her dress, he curtly bowed down in apologized at him. "I'm sorry for my rudeness. But please, let me reintroduce myself." Straightening herself, the caster attire began to fade into golden sparks. In its place was a blue dress, long enough to covered her whole body, short enough not to restrict her movement.
She looks... like an ordinary beauty now. Not as regal like she was as caster. Could the woman be... a pseudo-servant? That could have explained the amount of power she radiated. Before Romani could asked, the woman raised her hand in gesture for him to stop, causing the doctor to halt his question. Seeing this, she gave him a smile.
"Before you think that I'm a pseudo-servant which I am not. My name is Mizuo Maiya, the master of these knights. Like I say, I was send here to help Chaldea with the singularities. As for my abilities, one of them which is Servant Changling helps me to change my status from a human to a servant of different classes. It's an ability come once in my family's ancient bloodline," she smoothly lied due to the fact that the said was created by her own self.
A family bloodline? But how? Could she be from an ancient bloodline? Or she's one of the grand wizards' child? Either way she's a powerful entity that could turn the tide of humanity's future. Taking the chances, the doctor asked her help in restoring humanity's forthcoming in which, to his surprise, Maiya readily accepted. The female master had explained that she had saw what happened to the outside world and make her decision to help them, since she herself wanted to see humanity future as well.
Hearing that, Romani including the staff members became overjoyed and thanked her and her servants a few time. The three gives a gentle smile each before Maiya turns her attention to the computers. "Doctor, do you think you can ray shift us to Fujimaru-kun and the other? They'll need more man power than they had with them. If you can't, just gave us the location and timeline. I'll travel back in time to help them." she stated, gesturing towards herself and her servants.
Surprised, they now confirm that the woman was a wizard marshal in the making. No other magus could do that besides the high magus, and they were much powerful but equally notorious at the same time. Romani agrees to give them what she asked, providing her with the information and devices to used when they were in Fuyuki.
After a short briefing, Maiya summons her caster cloths before slamming Cielo end to the ground. Lights erupted from the said staff before engulfing its wielder. Just like that, the new master together with her servants disappear from their sight, already making their way to the singularity.

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Fate/Grand Order Alternative (up for adoption if you want)
FanfictionShe come from a world where everything was the opposite. Where King Arthur rules had succeeded and the tragedy of Camlan never existed, where legendary heroes live their life till old age. Her world only have one grail, and the only way to obtained...