First of all, I do not own neither Zero No Tsukaima nor Fate/Stay.

Second: I am looking for beta reader for next parts of "Endless possibilities" so if there is anyone willing to help please PM me.

-Endless possibilities-

-Prologue-

It was a warm, sunny day during late spring. Ideal day for birds to sing, white, fluffy clouds to slowly roll over the sky and pairs of lovers to have a picnic. It was also a good day for Tristain Academy of Magic for they annual familiar summoning.

"Well done Louise!" Shouted chesty redhead hugging petite pink haired girl from behind. In front of the pair stood big blue dragon, slightly tilting its head on side in mild confusion.

"Thank you Kirche, but now get off me!" Shouted Louise

"I agree with miss Zerbst It's an impressive dragon.. " Said man in dark robe. Apparently a teacher "Is there anyone left? "

Kirche smirked and pointed her thumb on person sitting under the wall of the courtyard "Tabitha." It wasn't fun to tease someone who doesn't get angry.

"Are you sure we should allow this? You know what's happening with small spells in classroom. With something big like summoning she'll probably blow up entire academy." Said Louise quiet enough to not be heard by incoming blunette and loud enough for others to hear her, causing wave of snickering.

"Quiet everyone. " Said the teacher "You all know summoning is sacred ritual, and interrupting it is severe breach of etiquette." Snickering died as it was never there. " You can start any moment miss Tabitha."

Girl raised her hands clutching twisted staff that served as her wand and started incarnation in inaudible whisper.

Somewhere in infinite possibilities

I turned from field of slaughter. After so long, killing, even such vile creatures, has become too easy. "Why I am still trying?" I ask myself and shake my head. I can't remember anymore. I'm not sure anymore if I ever knew how that "Holy" grail came to this world and why it appointed me and six other as Masters giving us ability to summon those engines of destruction. I don't remember who won, or if there was a winner. No matter what that person gained price was too high. I do remember people running away through the portals, and I remember those being twisted by grail's power spawning monsters whenever any master tried to go away of this dying planet. In the end war of grail happened to be small episode compared to what happened next. Entire armies of those monsters emerged from those portals. Some small and quick, other big and strong, sometimes being more portable fortresses than live beings. All kinds of creeps, too diverse to count. Ten thousands of demons weren't worth inch of soil lost or single man dead, even when they were fighting against one another killing themselves hundred times more efficient than we could there was always more of them to fight. Those left were more than enough to destroy every single pack of resistance. Those I killed today were only drop in the ocean

"Come" Voice, to faint, even for my ears to be sure I wasn't just hearing things. I spin reaching for my blade and in advance preparing to release destructive magic. But there is no one there. Slowly I calm myself dawn.

I knelled before man sitting on a throne, or rather a device he used as a throne. "Teacher." I lower my head.

"It's been a while, my child." His words as always appear in my head. His old body too exhausted by constant maintaining of camouflage spell hiding our small valley from demon, to even attempt to speak or move. That throne is only thing that keeps him alive allowing him to tap in power of every one of about a hundred other people of all races that live in this shelter. "You did well today"

I shake my head in disagreement "Even if I would kill thousand times more, for every day of my life it wouldn't be enough for them to even notice."

"I know you are right my child." Those words bear weight of centuries he saw "We have lost our fight here, and grail won. But I see that you still have your role to play in that war.."

Sometimes I can't understand him "I lack power, wisdom and experience to win."

"But you are still alive. And where is life there is hope, for grow, for better future. Never allow yourself to forget this my child. But now go. You need to rest." Not a word about that calling was exchanged between us.

Another night. Today we lost two man. They wondered too far and were seen by demons. That's why I have room for myself. Normally we sleep in groups in case of attack so there is at least chance that someone will shout and wake up others. I want to cry but I don't remember how. Sometimes I wonder what will happen to me if I keep living, no, not living, existing like that. I am tired. I even find myself thinking about slowing my moves in next fight to allow fangs and claws of my opponents to give me rest in death. And my teacher. Perhaps it's not even hope for surviving, but hope that I'll find some way to continue fighting that keeps him from dieing. I am not a god.

"Come."

And I keep hearing that voice. Am I going mad?

Trisatain academy

They stood there for more than a minute and they still weren't covered with dust like any time Tabitha tried to cast a spell. If not for stern look form their teacher several students would have already laugh. So the girl in front of everyone was still chanting with hand high in air.

That day was bound to come. Someone failed to notice small rat-like demon. And now entire legions are pouring into the valley. Tower of my teacher had fallen down covered in white fire. Even he couldn't hold them for more than a few minutes. I feel sting of sadness for his death but I cannot allow myself to dwell in such thoughts right now. I have to keep moving, find survivors and take them to one of hidden evacuation tunnels. And kill as many demons as I can.

First opponent appears before me. Left leg forward. Blade from it's position next to that led travels high over demons left shoulder cutting through extended forward right arm. Before it had chance to scream I reverse direction of movement of the blade and take its head off the shoulders. Another one. Strange cross between bat and ape is diving on me. I send series of energy bolts. It is dead before it reaches the ground.

I reached first wall and enter large 2 story guardhouse."Nimala. Estevele. Mathew." I speak. Loud enough to be heard inside the building, but quiet enough for stone walls to completely stop my voice from being heard outside. No response. I only hear sound of torn flesh from upper floor. Carefully I go up and find three guards being eaten by demons. Large hole in roof giving answer how those monsters were able to take them so easily. And worst of it I hear Nimala is still alive but even if I defeat those demons I won't be able to help her. I go down leaving before starting another incantation. This one sends impulse of energy into the earth beneath the guardhouse amplifying gravity nearly 50 times. It will be enough to instantly crush building itself and everything in it. I am sorry Nim.

Before I reach second wall I kill dozen other demons. One was able to wound me in leg with his spear. In the next guardhouse, towering over second wall, there are more twenty other of those creeps. It looks more and more like planned assault and that means that somewhere there is opponent strong enough to compel all those demons into obedience. Not to mention my physical and magical resources are already stretched thin.

I hate when something like that happens. I see that demon. About 10 feet tall with two pairs of bat-like and two pair of purely white feathery wings. Violet skin long red hair. But worst of it is something that looks like leg of maybe 2 year old child hanging from his mouth. I cast another spell. Series of black spheres flies toward my opponent but he casually reaches on the side and uses dead bodies of citizens to shield himself. Corpses are instantly turned to dust by my magic. My opponent smiles showing full set of shark like teeth. From behind me I hear steps of another demon. I spin guiding my blade low until it points in the direction of that monster. Then with one sharp move I slash it in two vertical halves, guide my blade over my head to face the leader once again. Just in time to take his attack head on. He grabs my blade without giving it a single thought and punches me in chest with other hand. Only good grip on my blade allows me to not to hit wall of a building hard enough to break bones or loose consciousness. It even menages to cut several fingers. But this hurts like hell. And the leader charges at me again. Between two heartbeats I recite another spell and he hits invisible wall that is now standing between us.

"You are strong" He sneers " I will enjoy hearing your screams." He hits the wall again but it's nearly impossible to break it with sheer physical strength. I stand up feeling sharp pain in my chest. Apparently his attack broke a rib or two. I will have to breath with right lung for some time. But now I push that sensation deeper into my mind. I have to run. That opponent is too strong for me in my depleted state.

I don't take even ten steps when wave of energy throws me onto the wall but I menage to avoid further damage by rolling along it. He broke through so fast! Real monster. I run further. I pass by two other demons, too fast for them to react but I menage to take only one, by slashing its throat with blade held in reverse grip.

Finally I reach evacuation fort but there are already demons here. Even as it takes only several seconds to dispatch startled monsters it's too long. Leader has cough up with me.

"You have nowhere to run." He laughs. I retreat inside, down to the lowest part of that fort. He goes after me even if he has to squeeze through narrow corridors. "Ready or not here I come." He taunts me.

"Good." I reply finally "See you in hell" I say and release wave of fire into hole in wall leading to gigantic mine that was meant to cover escape. It will be used in completely different way.

I don't feel pain nor heat. I don't hear explosion. I don't even fell tons of stone that rush to grind my body to dust.

But I can still hear that calling "Come"

Blue haired girl was beginning to tire. Her hands twitched. Her eyes squinted a little. Her lips stopped the incantation. She slowly let down her hands and lowered her head as in shame and sorrow. She started to turn toward others... And the light bloomed from under her feet.

-Booom!-

Coughing came from all around the courtyard. It took a moment before all the dust settled enough for everyone to see tall figure in flawless white cloak with hood obscuring upper part of his face, standing in front of petite girl. This was obviously not any animal nor some kind of fantastic creature like salamander or griffin. It looked like human.

"Well Tabitha." Said Kirche standing up from behind Louise familiar tail. "Today you outdone yourself. You summoned a commoner." She laughed and soon enough entire courtyard with notable exception of the teacher.

Cloaked figure lips moved saying words in a language that that girl never heard before, so Tabitha didn't understand a single word.

"Maybe we should allow her to try once more professor Colbert" Said Louise nearly falling on the ground from laughter. Tabitha just lowered her head a millimeter more. If she failed again she would not … she didn't even want to think about it.

"This is not possible" Colbert shook his head "As I already said (God knows how many times) summoning is sacred ritual that binds summoner and familiar for life." He turned toward said girl "Miss Tabitha, please finish the ritual"

Tabitha just stood frozen on the spot. She done everything all right, this shouldn't have happened. She didn't notice flickering of figures shadow.

"Do you understand me now?" Asked the voice. Girl just nodded, head still lowered in shame. "So now I ask thee again. Are you my master?" -It feels weird saying these words. But I guess you were right teacher, that I still have my role to play.- Slowly girl rose her head but didn't say a word. "Do you understand what I am asking of you?" There wasn't slightest hint of emotion in voice despite impatient words. Tabitha nodded uncertain what that person was going to do to her. "Then answer the question."

"Yes" Her words were nearly unheard in commotion around them.

"Miss Tabitha!" Came a much louder voice from behind the girl. She turned around just enough to look for the person. "Please, finish the ritual." Tabitha nodded uncertainly, rose her hands putting them on cloaked figure shoulders and gently pulled it down. Figure didn't offer any resistance as she put its face on even level with her and gave it a light kiss.

Two things happened in the same moment. Light erupted from under the hood of the figure. Second thing was blood dripping from Tabitha left hand on the ground when she let down her arms.

"Hey. Tabitha" Said blonde girl approaching the scene and took of a wand "You even managed to hurt yourself during summoning" She waved her hand "Come, let me stitch you up" she said but Tabitha didn't answer nor done anything to what could indicate she even heard the girl.

"It would be wise to let her take care that wound Master" Figure turned its head slightly toward the girl. Blunette slowly put her sight on her hand and finally rose her hand toward other girl.

Tabitha was lying on her bed but sleep wasn't coming. She felt embarrassed. No one in history of school managed to fail the summoning. She was completely sure that her classmates paid that person, whoever he was, to pretend he was summoned until they grow bored. And somehow they found spell able to create that strange signs. Her "familiar", although he insisted on being called "Servant" insisted that those are important but she didn't listen to him too much. There was no reason to talk with someone who will probably leave her before morning.

"You should try to sleep Master." Tabitha nearly jumped out of bed when she heard that. She looked at "her familiar". He did not move an inch since he gone to sleep sitting next to the wall with legs brought to his chest, warped in blanked she planned to use to make her familiar a comfortable bedding. "If my presence is disturbing your sleep I will leave."

It's not that, she thought but nodded nonetheless. Somehow he managed to notice that movement and stood up so quietly that if she wouldn't look at him she wouldn't believe he moved. Only after he left she allowed herself to get up. It this was going to be another sleepless night she could as well use it to do something constructive.

I traveled through the corridors of the castle trying to remain unnoticed by anyone. Certainly I wasn't noticed by chesty redhead engaged in making out with other student, nor by other pair talking about souffle or by several people of school staff busy with cleaning. I already assumed that it isn't some public school, like one my teacher told me about, so I was slightly surprised by lack of guards. Most of those children were probably progeny of some either rich, important or rich and important people. Well, as long as my Master is safe rest doesn't matter. I reached last floor of the tower and gone out on veranda. It has nice view, calm and tranquil. "How long it will stay like this?" I ask the wind. I remember myself watching stars from hill towering over my home. It looked somewhat similar. And I remember that hill turning black and red from blood spilled by countless dead just moments before my home village destruction. "I could use some good advice teacher." I shake my head. I shouldn't think like this. Now I am Servant. Sword of my master. And swords don't need doubts.