Kokushibo's Final Stance

The Battle of the Century

Muichiro and Gyomei head straight toward Kokushibo, his eyes fixed upon them with malice and pure bloodlust. He draws his sword revealing a katana with eyes all over it so that no one can catch him off guard with an attack in his blind spot. The hashira were already confused that a demon looked like a hashira, but their suspicion grew even more with his next words in the next moment.

"Moon Breathing, First Form: Dark Moon, Evening Palace," Kokushibo said and Gyomei and Muichiro were stunned in their tracks as Kokushibo pulled out his sword, and various moon-shaped blades were formed from his swing.  They have never seen an attack like that before and were stunned that a demon could use any type of breathing. The moon-shaped blades scattered across the battlefield and Gyomei tried to stop all of them with his chain while Muichiro tried to cover Gyomei and the other hashira in danger from the blades heading their way. 

"This is bad! If that's his first breathing style, I don't know how much worse things can get!" Muichiro said while heading straight towards Kokushibo's neck, he swings his sword... but there was nothing to hit. Kokushibo moved so fast that he created an after-image that made Muichiro hit the air and Kokushibo was behind him. Gyomei and the other hashira were in disbelief and at the last possible second Muichiro ducked to avoid getting slashed by Kokushibo's sword. One by one, the other hashira stood up and went on the attack and the real final battle began.

"How sad must it be knowing that all of you will die tonight? Only time will tell the outcome of this battle." Said Kokushibo in a somber voice and continue to parry all of the hashira's attacks with just one slash. They couldn't get anywhere near his neck and continued saying different breathing techniques to push them back. "Moon Breathing, Fifth Form: Moon Spirit Calamitous Eddy," the air was filled with moon blades that all the hashira spent their energy avoiding getting cut by the moon-shaped blades. Giyu tried his 11th breathing form to dodge all the blades, but there were so many of them that they penetrated his technique and slashed him across his body. All the hashira tried to destroy all the moon blades, but as they destroyed one it seemed like 10 more would just appear out of thin air.

"Stone Breathing, Fir-" "Moon Breathing, Sixth Form: Perpetual Night, Lonely Moon - Incessant!" Kokushibo said and swung his sword in a 360 direction and sent thousands of various-sized blades toward the hashira's way completely destroying the landscape with his attack and even people like Sanemi and Giyu getting hit by the attack with their stomachs scorching red from all the blood coming from their chest. While they took a knee, the other hashira dashed forward with rage and Obanai still had some fight in him with his eyes being slashed out. Mitsuri was still on the sidelines while the doctors still tended to her wounds. The doctors examined Tanjiro's state and it was not looking good, there was no possible way to remove the sword without him dying of complete blood loss. They also removed Kanao, Zenitsu, and Inosuke from the battlefield on the sidelines and they luckily still had a pulse. 

Kokushibo let out a giant slash towards all the hashira and the next moment heard "Wind Breathing, Third Form: Clean Storm Wind Tree" Sanemi somehow recovered from his injuries that should have killed him and even Kokushibo was stunned by his recovery speed. Kokushibo knew something was off when his vision started to get dizzy and Sanemi gave a little smile to Kokushibo. "My blood is extremely toxic to demons like you, and even if the effect wears on you for a few minutes, that'll me more than enough time!" Sanemi laughed and right behind Kokushibo was Muichiro and Gyomei going from behind with a quick glance got to the ready while all the hashira surrounded him with swords in the air and was ready to unleash all their breathing techniques simultaneously. Gyomei threw his chain out around Kokushibo's neck pinning his sword around the loop, Giyu launched at Kokushibo's hands to get rid of his sword,  and Muichiro, Sanemi, and Obanai went for his neck. It couldn't have been any more perfect. Unfortunately, there was the slightest gap in Gyomei's loop which allowed Kokushibo to break the chains in half with his sword, and the only one to get a good hit on Kokushibo was Giyu and Obanai. 

Kokushibo's speed of regeneration was so fast that Giyu got his sword stuck inside Kokushibo's wrists and Obanai barely got a hit off on him which sent Kokushibo back a few feet. The outcome was terrible, none of them completed their main objective, Gyomei's weapon was essentially useless to him, and Giyu's sword was by all means lost at this point. The only thing they were able to accomplish was by making Kokushibo even more enraged as they noticed something terrible.

"You've barely only shredded my kimono, not even enough to kill an infant..." Kokushibo said calmly and noticed his sword almost doubled in length with three other blades sticking right through it. He noticed the sword sticking out of his wrist and broke yet another sword with his bare hands. "What kind of monster is this!" Giyu said in complete awe of what just happened. "How is this even possible?! Not even Muzan could have done such strength like that to our swords!" Kokushibo got ready for his next attack and Gyomei had to improvise with his weapons on the spot and Giyu grabbed Kanao's sword as a temporary replacement. 

"No more with this poor swordsmanship, it's time to finish the lot of you for good with just one strike. Moon Breathing, Fourteenth Fo-" before Kokushibo even finished his line, an unknown force sliced off his hands and Kokushibo knew only one person that could have that sort of speed. Kokushibo glanced over and what seemed like a hallucination saw Yoriichi in the shadows. "HOW IS THIS EVEN POSSIBLE!" Kokushibo cried and quickly grabbed his sword and saw that it wasn't Yoriichi, but rather Tanjiro Kamado. Incredibly he stopped the bleeding and with his demon slayer mark activated, this would be the final stretch for the demon slayer corps with this one-in-a-lifetime opportunity to take down the true demon king.