Cero

Ulquiorra pointed his finger at Kokabiel.

A large amount of spiritual power formed on the tip of his finger. It formed into a green ball at the sized of a fist.

"This feeling... It's different from magic power" Sona muttered in a low voice. She feel a tugging feeling in her soul. It's not only her who felt this, everyone around her also felt this feeling. As if their soul was afraid of sometjing.

"What is this feeling?" Issei said as he felt something but was not sure of what it is.

"I don't know but I'm sure it has something to do with his power" Rias said as she looked at Ulquiorra.

"Sona, the barrier!!" Tsubaki approached Sona and said.

"I forgot," Sona turned to everyone and said, "Everyone, help me put a barrier around the academy"

Rias nodded as she turned to her servant. She instruct them to help Sona erect the barrier.

Kokabiel frown and he raised up his arm in the air. A spear made of light power formed up above his arm. He didn't know what was that but he was confident in his own skill.

The light spear he made expanded until it was at the three meters in length.

"Hmmp!! Take this!!" Kokabiel snorted as he threw the light spear to Ulquiorra.

"Cero" A huge green beam shot out from the tip of Ulquiorra's finger. The green beam was huge that it could engulf a whole house.

Swooosh!!

"Not good" Seeing this Sona immediately poured her magic power in the barrier they just erected.

The green beam destroyed everything in it's way. It destroyed the light spear made by Kokabiel easily. It was disintegrated into tiny particles when it crushed into the green beam.

"What?!!" Kokabiel exclaimed when he saw that his light spear was disintegrated in just a second.

The next moment he knew was that the green beam slammed into his whole body.

"Aahhhh!!" Kokabiel shouted in pain.The beam didn't stop until it crushed into the building.

"Grrr..." Sona, Tsubaki and the rest gritted their teeth as they poured every magic power they got in the barrier.

Boom!!

The school building exploded causing a mushroom of smoke to appear in the area. The ground was trembling because of the huge explosion that happened. The shockwave from the explosion made the other buildings shake.

A gust of wind swept passed everyone as they tried to covered their eyes.

After a few moment all of them put down their hands and all they saw was a large crater with a smoke coming out of it. There's many large debris of rocks in the surrounding area.

"One more shot and the barrier will break." Sona muttered in a low voice. She used mostly of her magic power to maintain the barrier. Luckily, it didn't directly hit the barrier or else it will break without any resistance. Just the shockwave alone was enough to cracked the barrier they made.

"That power" Issei's mouth opened widely at the scene he saw.

"The large school building was gone just like that.... " Saji couldn't believe his eyes. He felt that his eyes was deceiving him.

"I didn't think that Ulquiorra was this powerful" Rias muttered as she looked blankly at the large crater.

"Me too, I just know that my sister said that he was very strong" Sona replied.

"I thought he was a swordsman" Kiba said as he saw the sword in Ulquiorra's waist.

"Me too" Xenovia nodded at his words.

They were shocked at Ulquiorra's display of strength. A single shot was all it took to destroyed a large building. Even when they fought in rating game here in academy they couldn't destroy a whole building just like that, even if they fought with their life on the line all they could do was damage some parts of the building.

After a few minutes the smoke dissipated and all they could see was a large amount of debris in the crater.

"Where's Kokabiel?" Issei said as he looked around and didn't see Kokabiel.

"Don't tell me he died just like that" Saji said.

"No, he's not dead, look at Ulquiorra" Sona said as he pointed at Ulquiorra.

All of them looked at Ulquiorra. They saw that he was looking down at the crater. They looked over and saw that he was looking at the debris.

After a few seconds a few rocks moved and an arm emerge underneath the rocks.

"He's still alive and Ulquiorra knows it" Sona said to them.

"Cough, cough, " Kokabiel coughed a few times and he spat a mouthful of blood in his throat. His looks was clearly different from before. His body was full of blood, his hair was in a mess, and one of his arm was gone. His black wings were ripped apart. The original five pair of black wings on his back was gone, currently there's only three pair of black wings left. There's also blood flowing from his black wings.

He looked up at Ulquiorra with hatred in his eyes. "I'm going to kill you"