Basically, me and my friend (twicely, here and on AO3) were sitting around concepting Servants a while back and at some point a plot grew out of them and before long we were woldbuilding America in the Nasuverse and debating character arcs for OC Masters. This is what came out of that. Enjoy!
-F/A-
The darkened classroom shook violently, cracked and splintered furniture flying through the air. Some people ran for the exits, trampling over each others' bodies in desperation. Every inch of the room felt thick with terror, and the waves of madness rippling off the monster at its center crashed into those who remained, pinning them to the walls. The monster itself writhed and spun in search of its prey - civilian and Master alike. Horrific, squirming appendages emerged from the black mass of its body: arms, legs, and other, stranger things. Its very existence seemed to trivialize everything around it - no human alive would dare to oppose such a monstrosity.
Which raised the question of who could be striding out from behind a shattered desk towards the beast. He walked confidently, stopping about ten feet beyond its reach. Looking up at its massive, shadowy body, he laughed, pleased by the overwhelming power before him.
The man's companion was still crouched behind the desk he had just left. Her name was Zoe. She was terrified.
"What the hell are you doing?" she yelled, poking her head up from the desk.
He turned around, saw her panicked face, and laughed even harder.
"It is fine, Zoe!" he said. "After all, was this not the reason I was summoned?"
He was remarkably tall and had the strong, upper-body build of a weightlifter. His hair was cut close, and his loose robes were of a fine blue cloth, sparkling darker shades accented by what might have been clear summer sky draped about him. The regal appearance matched the confidence in his open grin. He spoke English easily, with a light accent.
"Okay! Okay." said Zoe. "Just… fight it, before it kills everyone in the room!"
He didn't look back, but his smile widened. He stretched out his hand, and a white light formed in his open palm. It coalesced into his weapon - a short sceptre tipped with flowing hair of some kind. The magical energy pulsing through the sceptre could be felt, even from where Zoe was sitting. There was one problem, however.
"I thought you had a sword! W-what even is that?"
"Swords are for the cowardly, and the runts of the mother's litter!" he replied. "I am the King, and the King wields his sceptre in all things!"
He twirled the weapon, and Zoe caught a whiff of ozone.
"Including the glory of combat!"
He crouched down for a moment, then leapt, higher than any normal person could ever hope to match, and fell toward the monster, lifting his weapon above his head.
"I accept your challenge, Berserker!" he bellowed. "Prepare yourself!"
"But… what kind of Saber doesn't even have a saber?" Zoe yelled after him, probably focused on the wrong thing.
The Holy Grail War had begun once again.