Archer & Assassin vs Avenger, Shielder & Caster

Alright based upon everyone's suggestions I'm going with FGO logic, but I will still have catalyst summons, any of the servants he takes out in a singularity has a high likelihood of being summoned after the singularity is over with, but also any of the drops, which I was calling data crystal fragments but should be Saints Quarts Fragments, or SQF that I'll call from now on that he gets enough of them he will be able to summon any servant from 1-5 stars, but I will use a randomizer to choose as well, but with an even distribution of male to female servants as a result.

***

"Hmm? Oh what do we have here? I say as I drop down into the now empty crater, there was no mangled corpse from my battle, just like when killing the skeletons, the shadow servant must have disappeared on death as well.

When I went to the center I saw a much larger fragment which had the symbol of a snake inside it, it was interesting for the bit before putting it within my Mantra Core as well.

"Senpai… are you alright?"

"Yeah I'm fine just that-" but my six sense from all my battles kicked in and using my super human reflexes, without even looking, stopped an arrow that was going to pierce my head with one of my hands.

"Ohh? You must be very strong to stop that without even moving an inch from your place." A man says as he appears on top of a crumbling high rise building as he looks down at us.

"Oh another one?… no, there's two!" I shout in a bit of surprise as I barely feel the presence of the man appearing behind me to dodge the assassins blade aimed at my throat.

And with a well placed kick that he was barely able to block I was able to widen the distance between us.

Both of them were shadow servants as well, most of there original features were obscured, the Assassin was covered in shadows with his skull like mask barely visible, and the Archer up above with his reddish outfit only slightly showing beneath the shadows surrounding him.

"Hmph, Assassin deal with the other two, I'll handle him." Archer says as he begins shooting volleys of arrows at me to keep my attention while Assassin goes back into stealth and heads for both Mash and Olga.

"Dammit! Why do all assassins do this! Mash! You got to keep us safe, I'm basically a sitting duck against servants!" It's not that Magus's can't fight servants it's just most of a Magus's attacks won't do that much damage that most servants would just ignore overall.

"Yes Chief!" Mash says as she prepares her Shield as Assassin appears right above her, just barely giving her time to block the attack.

While they were dealing with Assassin, I was chasing after Archer, who was keeping his distance while raining arrows down on me.

"Get the hell back here!" I shout as I'm just getting more angry with this assholes hit and run tactics as he try's to stay away from me as I chase.

Though I am gaining ground, it is annoying having to dodge arrow barrages while chasing after him at the same time.

Though the same can't be said about Mash who is both fighting the Assassin while also having to defend Olga simultaneously.

On top of that this is her first mission as a servant in all of her life as well, so with her lack of experience dealing with real servants, so she was losing ground fast, and with me dealing with Archer I might not make it in time.

But one momentary lapse in judgment from Mash was all Assassin needed to capitalize on her, and when he saw his chance he went in for the kill but-

"Liathróid dóiteáin!" A voice of a man in a somewhat Gaelic/Celtic accent shouted out as a Fireball went through the air and hit the Assassin sending him tumbling away from Mash as a result.

"You ladies alright?" Says the man in a blue hooded outfit while sporting a staff in his hand says as he appears to their aid.

"Caster…. I should have known you would stick your nose in this…." Assassin says brandishing his blade as now he is at a heavy disadvantage in this fight with his appearance.

I didn't know about this till later that certain classes are more effective against other classes, and Casters are stronger against Assassins for one major reason.

Territory Creation, most Casters have a semblance of this, even if barely at all the smallest area of territory that a caster can control is roughly a 10ft radius, and Assassins main way of attack is sneak attacks, but they can't do that when the caster can sense them entering there territory, thus cutting there overall effectiveness in half for the most part.

"Shield Girl! I don't know what kind of servant you are, but can you cover me? I'll be able to take him down but I need time!" Caster says while looking at Mash.

"I'll try as best as I can!" She said as she began to play as the defense while guarding Caster, who would cover Olga in the meantime.

"Dammit! Assassins in Trouble! I-" but before Archer could continue with that line of dialogue he felt his leg being grabbed.

"Gotcha!" I shout as I sent him hurling into the streets below, not to far away from the fight between Mash, Caster & Assassin.

"I am the bone of-"

*SMASH! CRACK! SPLASH!*

But before I even let him finish what he was about to say a crushed his skull underfoot as he began to fade away with death.

"I dunno what you were about to do, but I felt like I needed to stop it instead of just letting it happen like before." I say as I grab the archer fragment before looking at the fight going on.

"Dammit Archer!" Assassin says shocked at Archers abrupt and sudden death, but seeing this moment of distraction coming at a perfect time it was now Casters time to shine.

"Now! Wickerman!" Caster shouts as a huge humanoid like golem made out of wood appears and try's to grab at Assassin.

But even distracted Assassin is fast, the Wickerman is slow.

But Assassin is slower than me.

So before he can try and reenter stealth and get away I appear in front of him with a burst of speed as I uppercut him straight into the air.

And all Wickerman was that moment to grab the Assassin as it put him inside its chest before wooden spike pierced the body inside before causing a massive explosion as well.

When the dust settled the Wickerman was gone but so was Assassin as only a assassin fragment was left behind.

Shadow Archer (Emiya) & Shadow Assassin (Hassan of the Cursed Arm) have been defeated.

Only Shadow Lancer, Shadow Berserker and Saber remain

***

Avengers, heroic spirits of vengeance, this class is considered the hidden 8th class that can be summoned during a holy grail war, but was forbidden by the Clock Tower do to the likelihood of these servants turning on there masters and causing chaos in the mundane world as a whole.

Strong against Rulers, but weaker to Moon Cancers, these servants are considered to be the upgraded version of the Berserker Class as they still deal considerable damage to all other classes but without the detriment of losing one's mind in battle.

Be cautious when dealing with them as they have the strength of a berserker but the cunning of a caster, but if you can get on there good side and they follow your commands you'll have a strong Ace up your sleeve.