Lancer and Saber traded blows for several minutes, neither affording the other any ground. The ground beneath them became scarred from the forces unleashed by the two Heroic Spirits, but neither combatant had yet to suffer any damage from the others blows. Suddenly, as Lancer thrust with his right, Saber stepped into the thrust and, invisible blade glancing off the spear, slashed across Lancer's face. Both Servant's drew back, a line of red coming to life on Lancer's cheek.
"I applaud you Saber, though we do not know each others names it is still an honourable battle we fight, and I am honoured still further that I may bear the first wound, though yours shall be the last."
A voice boomed out over the heads of the three people gathered in that corridor of shipping containers.
"I believe this has gone on long enough Lancer, use your Noble Phantasm and finish this quickly. You cannot afford to be irresponsible with Saber." The voice seemed to be somehow mocking Saber with it's implications of strength.
"Do you hear that Saber? It seems I cannot take the entirely chivalrous route with this conflict." Lancer dropped his golden spear to the ground, which responded with a metallic clatter. The red spear that he still held began to glow as the wrappings that covered were stripped away by the rush of prana Lancer was channeling through it. "Now then," he called, weapon flashing in the artificial light. "With or without your permission, Saber, I'll be going for the kill."
...
Emiya Kiritsugu had found his vantage point on top of a warehouse away from the battle, but his modern concessions still allowed an excellent, if green, view of the battle and its surrounds. He could see Maiya, his assistant, far away on the other side of the battle; he could see Lancer's Master, perched conspicuously atop a warehouse a hundred metres or so away. Pointing him out to Maiya, he learned that she couldn't see the man from her position, but she could see a strange figure crouching on top of the crane he had pointed out earlier as being too obvious a vantage point.
"It's obviously someone who believes themselves capable of dealing with anyone who goes up there, so it must be a Servant." He whispered quietly into the radio, no matter the sounds ringing out around them, his words would travel far in the still air.
"Agreed. The clothes have similarities to the Assassin that was killed at the Tohsaka estate the other night so I would guess that he wasn't as dead as he was made out to be." Maiya's voice crackled back. "Assassin appears to be watching the battle, but if I fire at him it should give you the time needed to kill Lancer's Master." She was going to continue, but Kiritsugu cut her off.
"No, Lancer's just brought out his Noble Phantasm, so we'll only resort to that if Saber should prove to be in danger." Maiya acknowledged the order, but the radio was drowned out by the renewed clashing of blades.
...
Saber kept dodging left and right, wary of Lancer's Noble Phantasm. The red spear dove in and out of her range, bashing the sword to the side each time he thrust. It was hard to notice with human senses, but each time the blades made contact a tiny part of the whirling vortex surrounding Saber's sword was stripped away. Each time the vortex was weakened it was renewed with a minimal application of prana, but each time a glance at the golden blade beneath was granted. After many blows were traded Lancer jumped backward and charged in, spear held straight and true. Seeing this as an opportunity to end Lancer for good, Saber responded in kind. As she charged, she twisted her body to the side, causing the spear to miss her 'vital organs' as they were, instead glancing off to the side of her armour, gouging a channel through her armour and side.
Both Servants jumped well away after that exchange, Saber holding her side, Lancer grinning wickedly. In a flash, Irisviel had cast a healing spell upon Saber, who herself had realised the potential of Lancer's red spear. With a mere exertion of her will, Saber's armour dissolved into the prana that made up its form.
"Impressive, but do you think that just realising my spear's ability will help you win? You can convert the disadvantage of wearing armour into the advantages of not wearing it, but can you turn that into victory?"
Saber did not reply, she merely stepped forward in preparation for another charge; at the same rate she strode, Lancer did so in reverse. At the moment Saber began to rush, Lancer planted his foot into the broken concrete, unearthing the shorter yellow spear he had abandoned earlier. Swinging the yellow spear at Saber, Lancer charged it with prana to activate its abilities, dissolving the wrappings.
Saber dived to the side as the golden spear was swung at her neck, the blade cutting into the tendons of her wrist instead. Again both Servants jumped away after this, Saber was incredibly wary of Lancer now, who for the most part was enjoying what was now truly a battle to the death.
"A healing spell if you will princess." Holding her wrist, Saber called out for assistance.
"I did, but something's blocking it." Irisviel called out from behind her.
Saber realised then who Lancer was.
"Gáe Daerg, the spear that cancels prana; Gáe Buidhe, the spear that inflicts cursed wounds, even the spot which charms women. I don't know how I didn't realise it sooner."
"I've already given you a wound that will not heal, don't think that naming me gives you any greater chance of defeating me." Lancer spun his spears about, waiting for Saber to charge again.
"That may be so, but I see now that you are Diarmuid O'Dyna, a pity I do not have a legion of boars on hand though."
"Since you have done me the honour of giving me my name, perhaps you may also give me yours?"
It was at that moment that a chariot drawn by two bulls decided to lightning itself into existence on the battlefield.
...
The two bulls kicked up a great clamour, but not so much as the man who commanded them.
"I am Iskandar, King of Conquerors! I am serving as the Rider class in this War." As Saber and Lancer looked on in shock, a small voice piped up.
"What are you doing, you idiot?" The small young man beside Rider cried. "You'll get us killed if this is how you fi-ah!" With a single flick from his massive fingers Rider silenced his Master.
"Fate has brought us to this era for a magnificent reason." Rider boomed, mantle flowing from his brawny shoulders. "We all fight to have our wish fulfilled by the Holy Grail. But first I must ask of you:" Throwing his arms out wide, Rider yelled, if being even louder was possible, "How about conceding the Grail to me and joining my army? I shall treat the two of you with the utmost respect, both as my friends, and as my knights. We shall share the joy of conquest as the world lies at our feet!"
Lancer smirked. "I am afraid I must decline, King of Conquerors. I shall obtain the grail for none but my lord and Master, who I have sworn to serve with all my strength."
"So you interrupt a duel between knights for such an absurd idea? To stoop to being another's servant is an affront to my honour as both a knight and as a king, no matter how great you may be." Saber was a woman who upheld her honour, and she could not abide by Rider's terms.
"I did not expect the title of king to be granted to a little girl such as yourself." At no point did a mocking tone enter into Rider's voice, only one of astonishment and curiosity. Saber set her stance, sword directed at Rider.
"Do you wish to taste this 'little girl's blade, King of Conquerors?" Rider was rubbing his head in disappointment when the voice of Lancer's Master once again echoed forth.
"I had wondered who had stolen my relic, but now I see it was you. I am amazed the Grail granted you the right to be a Master, but I suppose you still need further education, Waver Velvet." Waver, Rider's Master, was brought low by the fear those words inspired. "In this war you shall learn the true meaning of a battle between magi, the pain involved as you fight those who may once have been your friend." The voice continued, but then stopped for a moment. "Lancer, there appears to be another intruder in the corner there. Deal with her." Lancer cast his eyes to Saber's right, where the path out of the area lay, and saw the girl with blue hair that had thought he was a pervert.
"I understand, my lord." Lancer bowed and began to walk toward the girl, spears bare and outstretched.
"Excuse me, but," the girl began, peeking around the side of one of the few still intact shipping containers. "A-are you all rehe-rehearsing for a play?" Her voice was too quiet for Irisviel to hear clearly, but to the enhanced sense of the Servants it was heard perfectly clearly. Saber began to run toward the girl too, totally ignoring Rider, who for his part stood atop his chariot with a sombre expression.
"Rider! Aren't you going to help her out?" Waver tugged at Rider's mantle, earning his Servant's attention and nothing else.
"Boy, you know what's going to happen as well as I, either she dies or someone's got a memory-erasing Noble Phantasm to waste. Besides, I didn't become the King of Conquerors because I troubled myself over the life of a single girl." Waver didn't look happy with the explanation, but he resumed his usual position on the floor of the chariot cowering.
"Watch yourself now boy, that duel was magnificent, but I won't be the only Heroic Spirit that heard the sounds."
"This is going to be a terribly long night."
...
Seeing two heavily-armed people running toward her, the girl ran back the way she had came, her panicked breathing giving away her position to the millimetre. Saber, channeling prana into her legs, sped ahead of Lancer to reach the girl first and was narrowly able to avoid Lancer throwing his Gáe Buidhe in her path.
"You should not turn your back on an opponent, Saber, especially in a duel to the death."
Saber turned to meet Lancer, swinging her blade to block the Gáe Daerg.
"Does your chivalry not require you to protect innocents? Tell me what is chivalrous about striking down an unarmed girl from behind." The girl in question had run around a corner just ahead of the Servants, where she thought she would be safe. As Saber and Lancer battled over the blue-haired girl's fate, she screamed. It was not a scream of surprise, but a scream of wrenching pain and it ended as quickly as it began. With a dismayed grimace, Saber disengaged the lance-wielding hero and intently monitored both Lancer and her potential new opponent. It was unlikely, but entirely possible her true Master had silenced the girl himself, one bullet a narrow miss into the body, the other correcting the mistake.
As was the theme with expecting the unexpected, the wholly expected happened while you weren't expecting it. The first clue was the slight sound of metallic rasping, achievable only by a person in full armour. The second clue would most likely be said fully armoured person stomping their way around the side of the shipping container, massive blade in one hand, pale arm not attached to pale body in the left. The third clue was entirely redundant at this point; but merely to emphasise the point that a person in white full-plate armour had apparently exploded everything of the strange girl but her left arm using nothing but a sharpened plank of metal as tall as its wielder was, the killer slowly daubed a dripping red crucifix on the gleaming white chest piece. Neither Lancer or Saber, great knights of their own legends, could identify the type of blade brandished before them. It was then that the modern knowledge imparted by the Grail came into play, telling them it most resembled a surfboard of grey metal, a handle placed in the middle almost as an afterthought.
A voice, amplified like that of Lancer's Master, rang out across the warehouse-filled concrete jungle.
"Berserker: kill Saber."
With a grunt, the white-clad knight dropped its macabre 'paintbrush' and charged at the two Servants. Lancer jumped out of the way, returning quickly to the battlefield, leaving Saber to block the behemoth sword rushing at her. The two blades met, the massive sword interrupting the swirling vortex concealing Saber's blade. Saber was on the defensive, the cursed wound on her wrist preventing her from using her full strength. Berserker kicked at her, sending Saber flying with a heavy blow to her stomach. Saber landed on her back, rolling out of the way as Berserker followed up with a leap and an overhead strike, burying the blade deep into the ground.
"I hear fools proclaim themselves kings, so I come to see how foolish they could possibly be. And what do I find?" hearing this, every participant in the War stopped cold, even Berserker. Kiritsugu and Kayneth recognised the speaker as the Servant belonging to Tokiomi Tohsaka, but everything else of the Spirit was a mystery. "A boisterous oaf who claims to be a conqueror, and a girl left to roll around with a rabid dog."
Lancer muttered and aside to Rider. "Aren't you going to invite these two to join your army?"
"I don't think these two are willing to negotiate either."
"Silence fools." The golden Servant called, his voice carrying perfectly well, even with his even tone. "Do not think to speak in my presence, ye chivalrous and mighty. And you, dog." He spoke to Berserker, with a wave of his hand golden pools of light came into existence behind him. "Do not even so much as look at me."
Berserker growled, metallic and enraged.
"Entertain me with your writhing, as your blood drains away." With a thought, two weapons began to protrude from the iridescent holes in reality. The two weapons, a sword and a spear, sped toward Berserker, and in an instant, all that could be seen was smoke. A moment later, Berserker leaped through the smoke and rose to meet the golden Servant standing atop a streetlight. They stood opposite each other, the madman in white and the King in gold, until Berserker charged across the gap and sliced the footing from under the other Servant's feet. The golden Servant landed with a jingle, Berserker with a yell.
"You dare force me to share the same ground as you? Die mongrel!" The Servant made a fist, opening the golden portals wider and wider until it stretched most of the way down the battlefield. Countless weapons shot forth from the golden pools, but Berserker either dodged away from the bombardment or blocked the missiles with the flat of the massive sword.
Seeing this, the gold Servant brought more weapons forth, this time surrounding Berserker with the golden disks. A small arsenal of weapons began to intrude upon reality, but the golden Servant suddenly turned to speak to thin air.
"You dare order a king to withdraw from battle? You are a brave man, Tokiomi." With a wave, the pools of light disappeared, the scattered weapons dissolving into particles of energy much like a Servant would. "You are fortunate tonight, dog." He muttered, then called out to the rest of the assembled kings and knights: "See that you are fewer in number when next we meet. Only a true Hero is worthy of fighting me." The golden Servant turned to leave, fading away much like his weapons had.
The remaining Servants stood for a moment, contemplating the overbearing Servant that had just left them. Saber noticed Berserker, still staring intently at the spot the enemy had recently occupied. Berserker jumped forward suddenly, surprising everyone. Lancer knelt lower into his stance, Waver cowered even harder and Saber stood defensively in front of Irisviel. Slashing wildly at nothing, Berserker confirmed the lack of Servant, then turned to regard Saber. With a feral roar, Berserker charged at Saber, turning to go around Rider's chariot. The two traded blows, Berserker's weight throwing Saber back a bit with each blow. Eventually, Berserker battered her defenses aside and was prepared to strike the final blow when Lancer stepped in.
Spears crossed to support the weight, the Irish Hero held the huge blade away from Saber. With a grunt, Lancer pushed the blade away to stand before Berserker, who simply held the heavy sword ready to strike
"I have prior business with Saber, so if you're going to keep playing around I won't be able to stand idly by and let this happen."
"What are you doing, Lancer? This is your chance to kill Saber." His Master queried, tone imperious
"I will slay Saber!" Lancer cried out to the echoing voice of his Master. "I, Diarmuid O'Dyna, swear this on my honour as a knight! But please watch, my lord, as I put down this rabid dog first."
There was silence as Lancer pleaded with his Master, then:
"With my Command Spell, I do order my Servant Lancer:"
"No! My lord!"
"Assist Berserker and kill Saber."
Saber jumped backward as Lancer turned on her, both spears flashing.
"Saber, forgive me." Lancer said, tears welling in his eyes.
A voice, deep, pained and echoing, rang forth.
"Cassius." It said. Lancer cried out as his right arm was stabbed through the muscle. Berserker withdrew the spear from Lancer's arm and stepped back.
"Fight Saber." Berserker shook in pain, clutching at his head. "Have… honour." The Servant ground out. With a mighty roar, Berserker disappeared into the ether and left the battlefield.
...
Kariya's chuckle carried through the clear night air far from the battlefield.
"They all ran from Berserker! I can't wait to see what the old bastard thinks now."
...
'If you will not pilot, then Rei must.'
It was a dream, but not his own.
'You will not die, because I am protecting you.'
Sometimes he could see his Servant, other times he was looking through her eyes.
'Music is one of the reasons I love the Lilim.'
His Servant had destroyed herself, but the dream went on.
'What are your hands for?'
His Servant returned, but neither of them were quite like the girl he had summoned.
'Then what is your heart for?'
...
Ok then, let's start.
Rei is Berserker, it's just the armour she summons is similar to the MP Eva units, not Unit-00. The happy girl personality is the Rei from Angelic Days that appeared in the final episode, hence the intense hatred of perverts and lecherous fools, at least initially.
There will be no happy ending, it would shame both the Butcher and Nasu for that to happen.