Before the Demon Boss could do anything, Asta's other hand was surrounded by lightning. The lightning was so loud that Ethan, Scott, and Logan had to cover their ears. The lightning was clashing with the ground, but it never left Asta's hand. It was like Asta's hand was the source of lightning.
Asta dropped the dagger on the ground as the lightning surrounded his fist.
In a lightning-fast movement, Asta used his lightning-covered hand to grab the black smoke. His lighting spread throughout the smoke and made an explosion of dust.
As soon as Asta grabbed the smoke, a scream emerged. "AAAHHHHH!!" The scream was filled with agony.
The Demon Boss was stunned by Asta's speed and powers. He saw Asta did not only hurt the Demon who tried to attack him. He had turned the Demon back into his human form from the black smoke.
The Demon's lifeless body was in Asta's hand.
Asta used more of his power and surged his lightning power into the Demon's body. Lightning was escaping from the Demon's ear, mouth, and nose.
In just moments, the Demon turned to ashes.
After turning a Demon into ashes, Asta faced the Demon group and his Boss, but his one hand was not covered in lightning. Both of his hands were covered in lightning. The lightning was striking the ground and left burn marks all over the floor.
Asta smirked and spoke in a cold, chilling voice. "Wrong Move!"
"Using Your First Transformation Against Me Was Wrong!"
"Not Listening To Me Was Wrong!"
"You Have Made Your Decision, And Now I Won't Let You Go Back On Your Words!"
As soon as Asta finished, all the lights went out, making the warehouse pitch black again, but this time. Asta was visible. His blood-colored eyes were visible, and the lightning escaping his hands were visible.
Suddenly, Logan saw Asta on the other side of the warehouse. He was only seeing a glimpse of Asta's face and lightning traveling throughout the entire warehouse.
Asta was so fast that in the dark. It seemed like lightning traveling in the room with red dots.
"AHH!!"
"ARRGHH!!"
"NOO!!"
"AAAHHH!!"
Screams filled with agony, pain, and fear echo through the entire warehouse. These screams belonged to the Demons.
A minute later, the lights turned back on and revealed all the chaos Asta did in the dark.
Asta was standing before Ethan, Scott, and Loga. His hands were not covered by lightning. His clothes were clean as ever. There wasn't a single spot of dirt on his suit.
The entire warehouse floor was covered in black Demon's blood. All of the teenagers that transformed into Demons were on the ground. All of them were dead. Some of them were missing an arm, a leg, head, and some of them had a massive hole in their chest. The only Demon that survived Asta's power was the Demon's Boss.
The Demon Boss was covered by the other Demon's blood. His eyes widened in terror as he could not digest someone that strong existed.
The Demon Boss took a step away from the dead bodies. His hands were shaking in fear.
"How Is This Possible!"
"A Demon Like Me Is Terrorized By A Human!" The Demon Boss thought to himself.
Suddenly, the Demon Boss felt an enormous amount of pain in his throat. He gazed down and saw Asta's right hand on his throat.
Asta had used his lighting-fast speed to grab the Demon's Boss's neck. His grip was so overwhelming that the Demon Boss struggled to breathe. His human heart was not in his control. It was faster than a horse. He began to sweat uncontrollably. The Demon Boss returned to his human form.
The Demon Boss used his strength to utter some words. "H... How... Is... This Possible... I... Am... A... De.... Demon!!"
Asta smirked as he heard the Demon's words. He effortlessly rose the Demon's Boss three feet into the air. Asta then pulled the Demon's Boss closer to him and whispered into his ear. His cold, chilling voice sent shivers down the Demon's Boss's spine.
"Nice To Meet You Demon!"
"Allow Me To Introduce Myself!"
"I Am The Devil!!"
The Demon's Boss's eyes widened in terror as he heard Asta's voice, but before he could do anything. Asta used his lightning power and turned him into ashes.
After turning the Demon's Boss into ashes, Asta first grabbed his son Ratsujin's watch from the ground and carefully placed it in his pocket. Then, he grabbed the same chair that the Demon Boss was sitting on a few moments ago.
Asta slowly dragged the chair right before Ethan, Scott, and Logan. These three were so stunned and overwhelmed by Asta's power that they froze.
"He killed everyone without even breaking a sweat!" Logan thought to himself.
"He didn't even let them reach their final form and kill them with such cruelty!" Scott thought to himself.
"Now, what should I do with you three!" Asta spoke.
Asta's cold voice brought all three of them back to their senses. They saw Asta sitting on the chair in a taunting way while holding onto the dagger.
Ethan panicked and said in a nervous voice, "We! We didn't do anything."
Asta responded to Ethan with a smile. He was looking at the Demon's blood-covered dagger all the time. "Didn't You Know! I Did Not Came Here For The Demons!"
Asta turned his face towards them and spoke in a terrifying voice, "I Came Here For You Three!!"