Fate: Bonds Beyond Humanity

"Oh~ You figured it out!" The stray tried to clap his hands but he couldn't. "You are right! I AM USING MY OWN ENERGY TO EASY THE PROCESS! THE EXCESS OF MANA MAY HAVE CHANGED MY FORM! BUT IT MADE ME INVENCIBLE!" The barrier got stronger and more visible as more mana was used. "NO ONE CAN TOUCH ME NOW! AND EVEN IF THEY DO I CAN REGENERATE THANKS TO THE MANA THAT I ALREADY ACCUMULATED! I REACH THE POWER OF THAT PHENEX BASTARDS! NO ONE CAN COMPETE WITH THE POWER OF A WHOLE CITY WORTHY OF MANA!"

He was right but that didn't mean that Shirou wasn't going to try. This being is a poison infecting the city for who knows how long and the redhead was going to put a stop to it.

"Calm down! You are in a hurry but don't just rush." Shirou told himself after hitting the sides of his face with his palms. "Do what you always did. Pick apart a problem and find a way to win."

That is how he goes to make his swords, to fight on kendo and now that he is going to bet everything on a life or death brawl, Shirou needs to remain calm.

"TRACE ON!" He could feel the mana passing by his circuits. It was starting to get hot and now it was going to get even hotter. "I WON'T LET YOU RUIN MY HOME!"

"COME MAGUS!" The devil roared in challenge, his barrier growing stronger. Shirou manifested two of his swords and ran to attack. "Heh, he never learns."

The confidence of the devil was not undeserved, his wall managed to contest and win against the mighty Power of Destruction from the Bael and even if his opponent passed there was no way a human magus would have enough firepower to kill him before he regenerated.

A pity for him that he wasn't the target. Two swords showed up in Shirou's hands and once he got close to the barrier he made a turn and started to race around circling his opponent while pumping the swords with more and more mana.

The two swords touched the ground and the result shocked the stray. "WHAT IS GOING ON?" He could complain but not react.

To keep absorbing the ley lines the stray couldn't just move and his body ended transforming, adapting to his nutrition and the fact that mana accelerated any mutations. Truly this form was more efficient to survive such a lifestyle.

But the weakness is the same as any magus workshop, from the most studious magus to the most powerful spellcasters if something happens that they can't use the ley line properly everything gets one hundred times harde.

Shirou couldn't move the monster but he could break the place where he was standing, the rocks breaking apart with the floor getting more and more uneven.

"STOOOOOOOP IIIIIIIT!" The stray demands and tries to unleash his power once again but the ground is already too unstable and he ends up moving, just a few centimeters, enough that his barrier breaks. "NONONONONONONONO!"

The ground gives in and both combatants start to fall to a deeper level. Shirou undoes one of his swords to fish something from his pocket. A piece of paper with the Gremory symbol on it. "RIAS GREMORY! I HAVE A WISH!"

Deep in the sewer, still fighting a horde of rats Rias feels a pull, the familiar connection between her and one of her pamphlets. She is exhausted, bleeding and charging the last of her power on a grand attack of desperation but the pull came just before she did.

There was no hesitation, this was her salvation. There wasn't ill intent and there was a wish to be done, with that her instincts took over and she let herself be summoned right above the massive stray.

Then the wish came. "UNLEASH ALL YOUR POWER! DESTROY THE STRAY!"

Shirou was just a bit above her but he was mostly safe if one doesn't count the fall to a lower level of the sewers, it was still better than the stray's position, below a very pissed off woman with a mass of destruction on her hands.

"DISAPPEAR!" Rias Gremory lets out the strongest blast of the day while using the rest of her strength to grab Shirou.

The once called 'Hamelin Flutist' could only scream and despair, destruction itself had come and it started to wipe out his body from existence completely. He tried to stop it, to make a barrier but there was no contest this time.

Without the support he had before his protection lasted less than a second, without the ley line there would be no regeneration this time. Even if the attack didn't connect he spent so much time connected to the ley line that the separation already meant death.

His body was just a mass of mana and flesh that his corrupted soul refused to leave and now he was going to die...There was only hate in his final moments.

Hate for the master who blamed him, for the Phenex he couldn't defeat, for the Gremory and for the human magus… "In the end… I never knew your name… BUT I CURSE YOU FROM THE DEEPS OF HELL MAGUS!"

There was nothing left of the 'Hamelin's Flutist' and even his name won't be remembered.

Rias managed to catch Shirou and bring the both of them to a stable place on the main floor. She was running on fumes by that point but still had enough to ask." Did you really just summoned me for an attack? How did you know it was going to work?"

Both were laying on the ground close to the hole where the fight had ended. "I didn't." Was the answer.

"You… didn't?" She lifts her head for a bit to look at Shirou but he just shrugs.

"I had no way to win against the guy. So I called someone who did or could." Both of them are exhausted and wounded, Shirou had put a lot on his attacks, every muscle of his hurt while Rias was still bleeding quite a bit. That didn't stop her from laughing.

"HAHAHAHAHAHA! You are funny Emiya-... no Shirou-kun! I like that! I really like that!" She tried to move but the exhaustion caught up with her now that she relaxed.

"You are hurt."

"That is obvious! Don't worry about it, we devils can survive a lot. I just need some rest."

"Gremory-san… is kind difi-"

"Rias!" She interrupted him immediately.

"Huh?"

"Call me Rias! We fought together and we bled together! I think that made us at least friends." She had a smile while she said that and Shirou couldn't help but see beauty in it.

"Fine… Rias-san-" She interrupts him again.

"Just Rias! Let the formality go already!"

"Rias…" Seeing she wasn't stopping him this time he continued. "I find it difficult to believe that anyone can shrug off your wounds."

"You are the one here who is human, remember?" Rias couldn't help but say.

"BOOOOOOOOSSSSSS!" Batchan comes from the entrance. "BOSS! BOSS! ARE YOU ALRIGHT?"

"Oh! Batchan! I almost forgot you were there!" Rias was happy to see her familiar again.