Animeverse Slayer!

"Dad, what's the final form of Dragon-Tiger Breathing?"

A young Leo sat on his wheelchair and asked his father. Hearing his son's question Talon Heart thought for a second and said.

"The final form isn't a form, it's more like an amalgamation of every other form of Dragon-Tiger Breathing."

"Is it strong?"

Leo asked curiously. Talon laughed lightly, he pushed the wheelchair onto the lawn and placed his son under the shade of a tree. He sat down near him and said.

"Strong? My son, when Aruha Heart, our first leader created this technique it only had one form and that is the final form. It encompass every aspect of battle."

Leo tilted his confusion, "Then why are there so many forms?"

"That's because Aruha Heart later found his descendants incapable of even understanding ten percent of that form. So he split the original form into two separate forms and then the two forms into eight. That is how the Dragon-Tiger forms came to be. Now you tell me, is the final form or the original form strong?"

"Strong!"

Leo nodded like a woodpecker. Talon smiled and ruffled his son's hair.

"Dad, what's the name of the original form?"

Talon raised his head and looked towards the sky, a yearning expression painted his face as he said.

"Azure Dragon-White Tiger Epoch!"

...

Leo's expression became peaceful, however the blood on his face along with that calm look brought out the innate fear within people.

Muzan's attack drew closer to him, the closer it got the calmer he became. Soon it was just a hair breath away from him. Sabito and rest felt as if the world slowed down, they could only watch helplessly as Leo was engulfed by Muzan's attack.

Just as their heart was about to plunge into despair a strange feeling arose in them. They looked up and saw Muzan stare wide eyed at Leo. His hand was gone, the distance between him and Leo was painted in blood.

"What did you do?"

Leo didn't reply. He closed his eyes and marveled in that moment. He had never felt so clear before. Opening his eyes Leo slashed at Muzan, it was a simple slash but a ferocious White Tiger manifested out of thin air and pounced on Muzan.

He dodged it and was about to attack when he saw Leo standing right before him. His eyes deep like an abyss stared at Muzan, seeing those eyes Muzan remembered some painful memories from three hundred years ago. For a second his heart shuddered.

No! He is just a kid!

Muzan calmed himself and attacked. His body reverted to that disgusting form filled with flesh tubes. Right now Leo was just a hand distance away from him, Muzan's attack closed him from all directions.

Leo calmly stood within the storm of attacks and let it fall on him but no matter how Muzan attacked not a single attack fell on Leo. Before it got to him a strange force shredded it to pieces.

What?

Muzan was startled. He didn't have enough time to think, he was cut in half. Leo was now standing beside him, getting ready for another attack.

Roooarrr!!

Muzan roared at the top of his lungs. His body healed in the blink of an eye and he plunged towards Leo. However every attack he made seemed to disappear, the ground was died three inch deep with his blood.

"Muzan... this is the end."

A scarlet colour seeped into the blade from it's hilt. It felt like boiling red lava as it spread through the sword, vapour rose from its body, the dragon and tiger engraving on it seemed even more real now.

"Azure Dragon-White Tiger Epoch!"

Leo's words entered Muzan's ears. The scarlet sword he had only seen once before in his life reappeared before him again, and here of all places. The sword cut through the air, it inched closer to his body.

Fear crept inside Muzan's heart, he knew if that sword makes contact he will die.

"Nakime!!!"

Muzan roared. The door that was some distance away disappeared and re-emerged beneath Muzan. Leo's sword swept past his head, burning his face. A long wound appeared from his right eye to his neck.

Leo watched as Muzan fell into the door beneath. Without a second of hesitation he jumped in.

"Leo! You crazy bas*ard!"

"F*CK! He jumped in! Let's go, let's go."

"Damn!"

Sabito smashed his fist onto the ground. Giyu and Makomo also had ugly expressions.

"Do you think he will...

"He will be absolutely alright! This is Leo, you saw how he defeated Muzan. He will return."

"Yes. He will."

They could only console themselves by saying that.

...

Inside the Infinity Fortress.

Leo stood on one of the platforms. He looked around and found many doors connected to different platforms leading to different destinations.

So that's how he moves around so fast.

Coming to that realisation Leo extended his spiritual sense and found Muzan. He was kneeled inside one of the rooms attached to a platform. The moment he saw Leo he smiled cruelly.

"When you return I will have killed the Corps and every single one of your friends."

"You won't get the chance."

Leo seemed to be moving incredibly fast. Each step covered tens of meters, in an instant he was before Muzan. He raised his sword and was about to cut down when two figures jumped out of nowhere and attacked him.

Raising his sword Leo swiped to his left, a man with three pairs of eyes parried his attack however like a hot knife through butter Leo's sword cut through the man's sword and bisected his body into two.

The other was a lean muscular man wearing a hat. He held a fan in his hand and blew out a cold breath towards Leo. Cutting down the three pair eyes demon Leo did a twist in mid air kicked out. The lean man was kicked in his gut, he shot through the room and flew far away spewing blood.

Leo didn't even bother with these two clowns and zoomed in on Muzan. His sword was already on a path to cut off his head, however Muzan merely smiled.

"Goodbye."

Before Leo could react several doors opened all around him. He was caught in one and descended into darkness.