If you expect this to be serious, …
Go read something else.
Gilgamesh frowned as his clairvoyance materials inside the Gate of Babylon told him to use his Noble Phantasm and how to do so.
"This is most definitely foolish," he grumbled as he pulled out a cart of potion of youth from his treasury. "I am the greatest king. Why would I need to display my collection of potion of youth when I already know-"
Whatever Gilgamesh might have finished saying, we will never know.
Why? Let's go to another scene.
* * *
Archer froze on the roof of the Tohsaka mansion as he watched Gilgamesh, the King of Heroes out for a stroll. Completely undefended when the Grail War would soon be starting.
He couldn't believe his luck. Should he take this opportunity?
His younger self had encountered Lancer and himself this night already and he and his Master had retreated to home. He probably should mention Lancer not giving up to Rin yet, but…
This was a once-in-a-lifetime, no, a once-in-several-lifetimes chance to get rid of Gilgamesh early.
Archer summoned his bow. He brought out a fast moving and powerful Noble Phantasm.
He turned it into an arrow.
He nocked it, aimed, and let his refined senses tell him if he would hit.
He couldn't believe it.
He aimed again, just to double check.
He would hit. His refined kyuudou, clairvoyance, and Eye of the Mind senses and skills all agreed that he would inevitably hit with no possibility of missing.
No sense in wasting a golden opportunity.
Emiya released the arrow.
And gaped in disbelief as Gilgamesh brought out of his treasury, at the exact moment he released the arrow, a cart of all things.
Not a shield, not armor, but a cart.
Right in the path of his arrow.
But Emiya's aim was true.
The arrow blew through the cart, causing the vials inside to go flying high into the sky.
And some to land and then break on the now dying King of Heroes.
Archer grumbled as he watched the almost dead Archer heal and shrink.
Of course Gilgamesh had good luck, A rank if Archer knew his opponent's parameters correctly. Naturally, the King of Heroes would manage to take a certain hit and kill shot and manage to survive.
And if Archer was seeing correctly, the King of Heroes was getting younger.
Then Archer's Eye of the Mind skill started laughing at him. In Alaya's voice.
"Well, this will be fantastic," Archer grumbled as he looked around himself for whatever would cause the will of humanity to laugh at him.
Nothing to his right. Nothing to his left. Nothing in front of him. Nothing behind him. Nothing beneath him in any direction.
Archer did a spin around, examining all directions for whatever caused his skill to predict the future to start laughing. At him.
Nothing.
And then he looked up.
Just in time for a large splat of liquid to land on his face and in his nose and mouth.
And Archer cursed the world as he felt his Spirit Origin start to change.
* * *
Meanwhile, in a house where a boy had just tried to survive an attack by Lancer, two Servants fought an opening spar.
Saber blocked the spear strikes expertly, her lifetime of training in swordsmanship giving her skill.
And then her A rank Instinct told her to lift her sword and block a projectile.
She immediately did so, wondering if an Archer had decided to join in.
Both her and Lancer momentarily paused as her sword shattered a pair of glass vials.
Some of the liquid in the vials bounced off Arturia's wall of wind surrounding her Excalibur back at her as she inhaled in surprise from having a glass vial like one of Merlin's potions break on her sword. Some of it continued onto her opponent, whose mouth was open in a wide grin.
Cu Chulainn discovered that Protection from Arrows did not translate into protection from liquids. Which he already knew from all the time he had spent in the rain. Made for some miserable battles because he was soaked wet.
And their fight ended as both Servants started shuddering as their bodies changed along with their Spirit Origin and Noble Phantasms. Not quite so much as shrank when compared to the other Servants since they hadn't changed much since their Lily forms but changed none the less.
Their Magic Resistance did not work on one of the supreme forms of healing magic, the potion of youth.
* * *
Caster was working on a spell under moonlight, confident that her protections would keep her safe and undisturbed.
She was right.
And she was wrong.
She finished the last of her Divine Words and sighed as she looked over the protective charm she had laid on the object she was going to give to her beloved Master.
"Master Souichirou," she sighed, her new love occupying her heart.
She probably should have paid more attention to the air around her.
Because there was no malice and the thing could not kill or harm, but instead healed and restored, her defenses did not work against the flying vial.
However, the vial's cork did decide at that very moment to come out, spilling its precious contents onto a witch.
Medea's magical senses alerted her to it.
She opened her mouth to utter a word to teleport her to safety.
Only for the liquid to splatter into her mouth, bounce off the back of her throat, and down her windpipe.
And Caster's Spirit Core started to change.
* * *
Assasssin was just standing at the gate. Waiting watching.
Good thing he was so good at it. You couldn't cut down a sparrow mid-flight unless there was a sparrow near you. And most sparrows did not let a person run to them.
You had to wait for them to get close to you. Patiently wait.
Assassin did not mind.
He just wished that someone would show up and allow him to test his skills. A lifetime of training and practice only for him to finally achieve his goal-
-and discover that he was too old to test his swordsmanship against any fighter.
But he learned meditation.
And to sense when something was coming his way.
So Sasaki Kojirou struck the vial out of the air while it was still falling towards him.
But the potion itself was the Noble Phantasm, not the vial.
So the vial shattered, splattering Sasaki Kojirou with its contents.
The man blinked, his closed mouth frowning.
Then he sent a finger towards one of the splatters of liquid on his clothes. He brought the liquid to his nose where he sniffed it.
'Hmm, smells like tea.' He thought.
Then he licked the drop and tasted it.
"Tastes like herbal tea," he mused. "But I've never had this flavor before."
Then he started to change.
* * *
Berserker was the same faithful and loyal Servant he always was. Still was insane but he was Heracles, the greatest of all warriors and Berserkers.
And while his Master walked along the streets of the city, the giant stood guard over her, following her in his Astral form.
And then his senses detected something flying through the air. Some small thing, at an unlethal speed.
But it was falling towards his Master. And it might hurt her, make her suffer pain from a bump on her head.
So being the protective giant he was, he immediately materialized and smacked the item out of the air, breaking it into so many fragments and drops.
"Berserker!" Illya cried out in shock as she felt the demand to support her Servant sharply increase as he took on a more physical form.
In order to respond, the giant breathed in in preparation for his usual reassuring growl.
And found that there were some drops that had been splattered onto his lips.
And a Servant like Berserker, who could easily bellow to be heard for kilometers around, had a strong inbreath.
And so, the mad giant breathed in Gilgamesh's potion of youth.
And immediately began to shrink.
* * *
Rider was escorting her Master on another expedition to find someone to feed to her. To give her more power until they could finish the Bounded Field at the school.
"Where is everyone?" Shinji Matou demanded petulantly to the air.
Rider could understand. Tonight was suspiciously empty of everyone. No one was out. Her ears couldn't hear any sounds from anyone outside. All the sounds she could hear had the muffled timbre that comes from speaking from inside a closed structure.
"Well, why aren't you finding anyone!" Shinji demanded as he wheeled on Rider. "Do you want me to lose! You're too weak to win without eating so get out there and find someone to eat!"
"Master, there-"
Unfortunately, Rider was wearing her blindfold and couldn't see what was falling through the sky towards her at that moment. And while she was speaking, she couldn't hear the quiet sound of the liquid falling through the sky.
In other words, her D rank Luck wasn't up to resisting the fate of the potion of youth falling into her mouth.
As Medusa unintentionally swallowed the potion of youth, her Spirit Origin changed.
And an unexpected result happened to Shinji's Book of False Attendants as the Spirit Origin of the Servant it bound, changed.
* * *