The Betrayed Beast (MHA x Black Clover x Demon Slayer)

Chapter Thirteen: Death Three

Seeing the newcomers, Muzan growled in anger and couldn't believe that someone like Asta can still find their dimensional fortress. The leader of the demons saw a glimpse of Asta's devil smiling and waving at him.

'Hello there, motherfucker.' Leon chuckled in his aura.

'That devil...He must be the one who sent those pests in here!' Muzan thought.

"How could this happen?! How did you enter this place?!" Muzan angrily asked.

"Hey! It's your fortress' fault on why we entered in here!" Zora said.

"I won't let you hurt Asta or any of my friends in here!" Gordon said.

"Boy, can I switch myself to yours right now? Let me explain some things to this clown." Leon said

'Sure.' Asta thought. The devil-possessed kid now smiled and his the sclera in his eyes turned black and his lens changed into red ones.

"Hey, Muzan! Do you remember this voice, aren't ya? Listen, the reason why we got in here is that you really suck at concealing the fortress! As we came out of the estate, we only saw nothing but no one and the dust swirling around the road. And I noticed something strange about it.

I asked some runts to come with me and inspect the dust that continued swirling into the road and I found out that it is the air pressure that your fortress blows so that it can float like a spaceship, which is a really cheap way of concealing it to everyone. Only with demonic powers can enter the fortress and as I ask this body to slash his sword into the dust, I saw a crack into it and opening it, was you guys fighting some random people and our fellow Demon Slayers like Tanjiro.

So, you can't hide yourselves now because we are going to crush you!" Leon said and now Asta takes back his body over.

'Nakime forgot to run this place away from the estate. Wait, if I can still use her right now, she can fix those leaks right now.' Muzan thought.

"Naki--" Muzan was stopped as Gyaku imprisons Nakime in his time sphere and all of the demons in the fortress got burned by Gordon's poison magic.

"How could you." Muzan uttered.

"Muzan!! I'll fucking slash your head into pieces!!" Sanemi roared.

"Let's cooperate as one and defeat this monster for good!" Shinobu said.

"I won't let you go away this time, Muzan..." Iguro coldly thought.

"Tch! I think this is going to be me against the Demon Slayers and some random brat who has a devil with him! Then, take this!" Muzan roared as countless tentacles with poisoned blades on the tip of it now rushed the Demon Slayers. The newcomers dodged the blades and Asta flew to where Zenitsu is.

'He turned into a demon?!' Asta thought.

"Smack him with your sword, boy!" Leon ordered. Asta rushed into Zenitsu who has his sword stabbed on All Might. The Thunder Breathing user jumped away and charges his ability in the ceiling.

"Hell Lion's Breathing, Sixth Form, Penalty Swing!" Asta swirls his whole body and flashes in front of Zenitsu, he slashes his sword on his neck and this made him back to normal, but blood spurted out from his neck.

"Gah!" Zenitsu cried as he returns to normal but receives a huge wound from Asta.

'You may turn them back to normal, but that doesn't guarantee that they are safe from my curse. As you try removing the curse from them with a weapon, their skin will be so thin that even a pinch from a human can wound them.' Muzan thought with a smirk. Gyaku appeared in front of Zenitsu and a clock appeared on his palms, which makes Zenitsu's wound heal.