My Upgrades Are Invincible

It took a couple days to get everything together and I was able to fuse a more common spider lily that was indigenous here to Japan along with some blue dye and to give it a supernatural kick I added some of the healing elixir's I had in my space ring which made it so whoever ate one of the petals would heal a decent enough amount to sell how it was clearly supernatural.

Then we spread the news of the flower throughout Tokyo, and we knew the bait was certainly taken as several of the flowers we donated to research institutes were forcibly broken into and all the people within were slaughtered down to the man.

Not only was that plan going well, but another good bit of good news was also how Tamayo was able to basically filter out Doma's blood out of Nerine and thus tethered her demon connection to Tamayo that way when we killed Doma she wouldn't die like all the other demons connected directly to Muzan would when he dies while I was gone.

"This is certainly going to be the flashiest battle Japan has ever seen in its history." Tengen Uzui said as all the Hashira and me sat atop the roof of an abandoned estate Tamayo bought to have the "supposed laboratory" at.

We knew this was to be the final battle as because of the several massacres we announced that we planned to send the last samples overseas after our final labs closed to avoid whatever force was hunting the flowers so violently.

"Yes, this battle will define not only this century but the efforts our Seniors put into and died for during the centuries of slaying demons." Gyomei said clasping his prayer beads between his hands and I couldn't wait for him to join my Familia as he had instantly agreed to join when I offered to bring back the fellow orphans that had died previously due to disease and the demon that attacked.

But both Sanemi and Obanai pretty firmly told me to basically fuck off though Obanai's tune changed when the Love Pillar excitedly responded an affirmation to my question as she was still on her husband search and Obanai still was too much of a caustic ass to chill and express his feelings and came off as a possessive creeper.

And either the rest agreed or was stuck with indecision like Muichiro Tokito who was frankly too young to be faced with this decision to just up and leave his world, plus he didnt even have dead family I could use as leverage to bring him closer so despite his great potential I didnt bother pressuring him and possibly push the other Hashira I had gotten close to away.

But either way I got the four I wanted most which was Gyomei, Tengen, Shinobu, and Giyu with a couple others agreeing along the way.

A massive explosion was the answer to our thoughts as not even a few moments after Gyomei was saying his prayers towards our safety a massive wooden door opened and dozens of demons poured out of the gate.

"The infinity Castle has been put into effect... Remember if you are caught by her make sure to link up with others as its almost impossible to defeat her without being able to split her attention."

"Haha! We Hashira only regrets that this battle didnt happen sooner!" Rengoku said heartily with even the obstinate Sanemi nodding in approval.

Tengen then whistled an ear-splitting tune that would carry for a couple miles with his enhanced lungs and a series of war cries erupted as the lower ranked demons' slayers joined the battle as even the Hashira's couldn't deal with the several hundred demons that finally made their way out of the gate and settled into what was almost a square formation which looked comical with how fucking messed up the demons bodies were as few were even looking human with large robes thrown over them.

"Lets Go!!!" Sanemi yelled out and I could only chuckle seeing the mad battlelust his was exhibiting but I and the rest jumped off our perch and dashed forward towards and through the throngs of lower ranked demon slayers towards the wave of lesser demons.

I as the fastest was just about to send a massive space blade to hopefully split the demon formation in half and drive a wedge had to franticly dodge as a massive icicle formed into existence in front of me almost instantly and a blur of gold was sliced straight at my eyes, and I could only let it skate through my hair as I dove into the ground and rolled away from Doma.

"Jake it's you again..." I heard a proud deep voice murmur and as its voice carried across the frozen battlefield it froze all who heard the malice contained within and all eyes were drawn to the well-dressed man wearing a western tuxedo and a fedora as he approached me. "You foiled my actions not all too long ago and now you interfere with my plans with the Blue Spider Lily?"

Muzan shook his head and his amber eyes turned blood red and slitted as his black hair turned white and numerous bladed whips formed across his body. "No Jake... This isn't your trap. This is me getting rid of the irritating demon slayers that have annoyed me endlessly over centuries."

I laughed uproariously making the demons twitch fearfully at how Muzan's face twitched into a snarl at my disregard to his words, but my words only made them look confused. "Not only are you wrong little Muzan... But a new friend of mine has a question for you."

At that everyone looked at me in confusion but finally a form gently pushed its way in front of the demon slayers and with the man wearing white robes and carrying a red sword he was certainly different from the other demon slayers wearing predominantly black.

"Muzan Kibutsuji... I asked you many years ago what was the value of life and you said that no life other than your own had any value." Yoriichi Tsugikuni said with power dripping from his every word as every demon shuddered and more than a couple literally collapsed from the sight of him as the inherited memories from Muzan overwhelmed them. "Now I wonder how you will plan to escape again from me."

With that said Yoriichi dashed forward at a speed even Ais would struggle to deal with as his superhuman body clashed with the stunned Muzan and within a split second the greatest demon slayer had stabbed Muzan more than half a dozen times before dashing out of the retaliatory blows from Muzan.

But even as Yoriichi was dashing backwards to our side a roar of pure insane anger reached us as the number one demon Kokushibo his older brother attacked Yoriichi by sending a swathe of solid arcing beams of energy at him with his moon breathing style and alos killed several demon slayers who were behind Yoriichi.

"Yoriichi you keep up with Muzan and your older brother! We will deal with the rest of the Upper Moons!" I yelled as I skipped through space and smashed my sword with all my strength into Doma who was fighting with the reunited Kocho sister's.

I was surprised at how the golden fan he was using was able to take the clashes between my blade, but the stronger head on blows were slowly folding and crushing the metal and he was abandoning it to use his blood demon art to make large exploding floating lotus in the air and attacking me with ice constructs.

I had to wear the full body protection of my armor as Doma's poisoned ice mist was starting to hurt my lungs and thankfully I knew I had powerful antidotes made from my fusing to heal both myself and the Kocho sisters as they were coughing up blood from our battle and the demon slayers who didnt have a decent breathing style literally keeled over dead within moments of attempting to assist in our fight.

But no, the majority of the lesser demon slayers were captured within the doors opening instantly and dragging them into the Infinity Castle, but I saw Giyu and what looked to be the main cast as somehow Zenitsu, Inosuke, Tanjiro and Nezuko dove into one of the doors leading into Nakime's reality marble.

'Hopefully they will be alright.' I thought before my mind was dragged back into the battle and I managed to cut off one of the arms of Doma who only snickered and grabbed the cut off arm as he spun around and used the longer reach of the arm holding the cut off one to swing the arm and fist to smash into my armored head throwing me a good distance away.

"Ah you poor thing... Does your head hurt? Would you like to join my cult instead of fighting us?" He asked not even bothering to question me to become a demon with my strength and instead offered to share his hundreds of slavishly devoted women that lived bred and died for his amusement.

Shinobu didnt even give me a chance to give a rebuttal as she performed the dragon fly step or whatever it was called when she did a crisscross dashing motion that made afterimages and made several large slashed onto Doma making him laugh at how she couldn't even come close to decapitating him.

"No, he will not be joining your cult, He doesn't need a cult because he has me to wait upon his desires!" Shinobu said proudly expressing her fealty to me but Kanae her older sister could only giggle as even other people who heard threw odd looks at us for her wording.

Doma being the sociopath he was didnt bother sounding distraught at her basically underminging her or anything as he cheerfully replied. "Oh, what a joy well if you have a daughter, please send her my way. I am sure such a joining between a Hashira and a man like he will have the greatest potential." Doma seemed to be in thought before his following words made me clench my sword in fury. "I wonder how strong I will get if I eat his children..."

But it was only Shinobu's titter that made me look at her and she wore an almost insane smile of vindication as Doma started to literally expand and began screaming agony as the man's veins glowed a diabolically green.

'Oh, shit I forgot that I fused some seriously dangerous poisons and toxins into Shinobu's sword,' Turns out Demon Regeneration didnt hold a candle to the toxins within Behemoth and the miasma of the Balrog.

Then I didnt even get a chance to attack Doma as his head was almost gently taken off with a swipe as Kanae used her butterfly breathing to dash past Doma and take off his head with the motion.