A/N An idea that's been pestering me forever. This is AU and I'm doing what I want. Don't own anything.
Beast
For a servant to be classified as a Beast, the legend must be filled either with an oppression from the whole of humanity itself or to be used by humanity for oppression, however this oppression is not merely local but global. Such beings, could in theory exist even during the present times simply due to the fact that the main factor that produces Beast, is Humanity itself.
That creates the difference between and Avenger and a Beast, with the former having caused planet wide destruction that changed the course of Humanity in that reality. Summoning Beast is extremely unlikely and can only be called random, since no reasoning can be connected. Some speculate that Beast chooses to be summoned, however unlikely that sounds. As Servants, they are indeed of the highest rank, easily grappling with the Grands in terms of power.
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Ristuka could only stare as Goetia fought against all the Servants of Chaldea, taking them all on and managing to push back. It was horrifying to realise the power of this monster that exist, to think of taking on the various Servants, such as Gilgamesh, Ishtar, Iskandar, Arturia and more. It was crazy and terrifying. As he watched his friends getting pushed back and heavily injured, he knew that he could only hope this would work. "Senpai the Summoning Circle is ready, we must hurry!" He snapped himself out of his daze and rushed over to Mashu who was standing before the circle. "Alright Mashu! Go help them, and I'll sent the new Servant in immediately."
"Hai! Mashu Kyrelight heading into combat." With those familiar words, she disappeared eager to join her friends against this foe. Ristuka could only stare at the girl he loved, hoping that she would be okay and that they could all go back to Chaldea. Steeling his gaze, he put his hand out and started the chant.
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"Sister to your left!" Arturia yelled at her Alter counterpart as a black orb rushed at her. Alter snarled and ducked letting the orb pass over her, "Come now! Keep fighting!" She roared out to the Knights alongside her, a nostalgic feeling blossoming at seeing the Round Table fighting by her side again. "Yes my King!" Bedivere replied, swerving through the orbs while Tristan blasted the various shadow servants, Gawain and Lancelot preoccupied with the Demonic Beasts.
Her Lancer part appeared beside her, scuffed up and bleeding, "This doesn't seem to be going in our favour, we must hurry." Suddenly a black orb appeared and smashed into the Lancer, throwing her into the ground where she laid, struggling to get up. Alter's nostrils flared in rage, before with a swing of her blackened blade and a burst of mana she cleared the surrounding area, buying them a few seconds. "Bedivere, grab her and take her back to Master!" Seeing the Knight nod, she moved forward ready to strike her opponent down, when suddenly swords fell from the sky. She glanced up, watching the King of Heroes raining down his treasury, "Come now you mongrels! Put some backbone into this." He laughed, causing the other servants to grumble.
Iskandar roared, "King of Heroes! Make us a way and we shall deal with the Beast!" Gilgamesh smirked, "Tch, very well oh Conqueror. Witness my might and be in awe!" The Gate of Babylon opened up, wider than anyone had ever witnessed, and hundreds if not thousands of swords, axes, and all kinds of weaponry fell out, slicing and smashing the foes. Iskandar grinned, "Come now Servants of Chaldea! A path has been made, now we charge and take the victory!" With that, he roared and started riding towards the Beast which merely floated above ground, injured yet still capable of taking them on.
Goetia watched as the Servants approached, confused at their actions. "Did you forget oh great heroes of old? I am Goetia, a Demon King, your pathetic attempts will only lead to your death!" With that, he send out purple beams towards his attackers, some hitting and some not. Soon, they were close and he smirked, "Truly your arrogance knows no bound. Face my power and be blown away!" The Servants closest to him stopped and roared out, realising the trap, "Turn back!"
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It was like watching a movie and feeling the effects yourself. Ritsuka could only watch as Goetia exploded with power, throwing all the servants back, the shockwave sending him back, smashing into a wall, the ritual interrupted. As he slowly struggled to get back up, he could only watch in horror as the servants which had been so far away, where laying so close to him, each bruised and defeated. "No.." Tears welled up in his eyes, his friends and comrades, dying in front of him, his enemy slowly, calmly making his way towards him. "Do you understand now human? You could never hope to defeat me. I am your end!"
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He was sleeping, silently waiting. How long has it been since he had been awake? Years? Centuries? It did not matter. He would always feel the pull, and he would always ignore it. It was not his responsibility to save Humanity. He had given that up a long time ago, when they turned their backs to him and tried to kill him. But this time, he felt it. A presence that he could never forget, that which he searched for all this time and this Master was nearby the presence. He could feel the dark energy of the Beast, and feeling the weaking presence, for the first time in an unknown time, he felt rage and with a snarl, his eyes opened, the strangest of eyes. His irises contained an outer golden bronze circle, a middle steel colour circle and a middle, golden circle.
Feeling the pull lessen, he grabbed it and with an angry wrench, he pulled himself forward.
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Arturia watched as Goetia approached, unable to do anything but simply lean on her sword, her fellow servants in similar or worse states. She watched as Goetia raised his hand and a black orb appeared, ready to be let loose. And that's what happened, as she watched the orb approaching Ristuka, she could only close her eyes and wait for the inevitable. Instead, she only heard the sound of steel smacking something and as she opened her eyes, she caught a glimpse of the black orb flying into the sky, away from them all. Hearing gasps, she turned her eyes to what saved her master, only to draw in her breath in shock.
He stood there, camo pants, combat boots, a white shirt and a brown jacket. Simple yet so fitting. He was pale, with red-orange hair, still so familiar yet it was the eyes that spoke of something strange happening. And then, he spoke. "I can't let you do that Goetia." The Demon King glared in confusion, "Oh? A surprise Servant? And who are you oh Hero?" The man smirked and chuckled darkly, "Hero? I am no Hero. I am Selfishness, obsession and greed and yet I am Utopia. Bearer of Avalon. Slaughter of Type Mercury, Killer of Humanity, Murdered of the Gods, Beast of Calamity. But you may call me, Shirou Emiya."
A/N It's just a oneshot. Something I thought about. Feel free to adopt if you want, though do inform me if you will do so.