In the underworld, everyone was getting ready to watch a duel that no one knew what to expect. Up in the v.i.p area, there was several people there. Including the 4 Great Satan's. There was their respective families as well.

There was Lord Phenex and his wife there as well.

As well as Azazel.

Also there was Kai and Kalawarner and Raynare too. However most of the devils didn't like the fact that there were fallen angels in there.

They all were about to watch a fight that would shock everyone.

"So this kid thinks he can beat my son?" Lord Phenex said amused.

Sirzechs shook his head at how arrogant the devil was being.

"I don't know, this boy may surprise you after all." Serafall said suddenly.

Sirzechs had a grin on his face as Lord Phenex looked appalled.

"How can you say that? He is an unknown, along with those filth he calls his friends and family." He screeched aloud.

Azazel suddenly looked interested.

"How did it come to be that two members of my faction suddenly grouped with him?" He asked curiously.

Everyone looked at the two girls as they looked away from all the attention they were getting.

"Issei was always one help those in need, as long as they didn't cro}ss any lines." Kai spoke up suddenly.

Lord Phenex laughed aloud.

"So a fence sitter? You really think someone like would win against the heir to the Phenex clan?" He mocked.

Everyone who knew of Issei's identity just shook their heads and watched the screen as the duel was about to begin.

{Scene Break} {With Issei}

As Issei stared at his opponent impassively, he started to think about how he should fight this foe. The regeneration was the biggest obstacle, so that left him with two options.

Either brute strength and beat him into the ground so bad that he couldn't it all at once, or attack him continuously so that his mind wouldn't be able to keep up.

He was brought out of his thoughts as Riser started to laugh loudly.

"I can't believe you actually showed up. You have no idea what your getting into." He said arrogantly.

Issei just shook his head.

"I could say the same to you." He muttered.

Riser continued to laugh.

"Do you, really think you can take on the mighty Phenex!?" He asked aloud.

Issei snorted.

"I believe you have no idea what your about to face." Issei said aloud.

Riser sneered as his pyrokinetic wings came alive.

"Let's see you try!" He shouted.

Issei just shook his head again, he looked to Riser to see him charging. Issei's eyes widened as he saw Riser moving faster than he thought he could. It seemed this fight he was going to need to take it seriously.

He quickly rolled out of the way as Riser's flame coated fist connected with the ground.

"I'll say this, you are fast." Issei said.

He then jumped back as Riser charged again.

"However, not fast enough." He mocked.

Riser was starting to get angry, he stood up and looked at Issei.

"You may be able to dodge my punches, however you won't be able to dodge this!" He roared.

Suddenly the flames around him grew brighter as they grew in size, before anyone knew it, 4 fire torrents had been launched towards Issei. Issei wasn't expecting this kind of assault this early on in the fight, it was actually pretty smart to do. Covering all directions to make him not be able to dodge any of them.

He had one option to avoid this, however it was going to take a good bit of energy. He knew Riser didn't make those flames at a low temperature either. So there was only one thing he could do.

Up in the v.i.p room the spectators were surprised to see the fight. Lord Phenex smirked seeing the fire coming towards Issei, as it finally hit the target, it was a raging inferno of flames.

"I told you guys, this boy was no match for Riser!." He said arrogantly.

Everyone watched with bated breath. Kai knew Issei was fine.

Akeno was looking worriedly at the raging flames, she didn't know what she truly felt for the son of Lucifer. However, she knew when he said those words to her that day on the roof, it had sparked something deep within her, and it hadn't gone away yet.

The other people were looking worriedly as well, they thought this boy might of been ended already.

It was when Serafall noticed something, did she speak up.

"What is that?" She asked suddenly.

Everyone looked to where she was pointing, it looked like frost underneath the flames, and it was spreading. Eventually it spread so far that even Riser noticed it and backed up.

Kai smirked at seeing it.

"So that's what he's doing." He suddenly spoke up.

Everyone turned to him for an explanation. He chuckled and started to explain.

"Issei has various types of magic he can use, he is using ice magic to create a dome around him of sorts, while expanding the ice as well to snuff out the fire." He explained.

Serafall was suddenly interested even more in this boy, first lightning, now ice? She quickly thought.

"Even so, it won't help him a single bit, the flames will eventually melt it." Lord Phenex said foolishly.

Kai laughed like crazy after hearing that. Everyone turned to him as he calmed down and continued.

"I doubt that, Issei's ice magic can create ice of various temperatures. Even absolute zero." He said.

Everyone's eyes widened when they heard absolute zero.

"H-How? To create something like that requires immense of control over that element!?" Serafall asked astonished.

Kai chuckled again and explained.

"He has devoted most of his time to his individual abilities and improving them beyond normal capabilities." He simply said.

Everyone widened their eyes at the implication of his statement, he was holding back.

Holding back a fucking ton.

They all watched as the flames finally dispersed and what was left underneath them, true enough there was a dome of pure ice with it spreading out in a circle. Everyone was in awe of it.

Suddenly they could see a red glow coming from the inside of the ice dome, they watched in awe as it grew brighter and finally exploded the whole dome apart with a burst of demonic energy.

"What was that?" Akeno asked suddenly.

Kai looked the girl for a moment and took in her worried face, his face suddenly got a grin on it as he figured out this was the girl who was starting to get through to Issei.

"Issei has learned to seal parts of his energy to release at a moments notice. He can do this with large amounts to create a burst effect." He explained.

They all turned to the duel to see something that shocked everyone, Kai looked down as he saw it as well.

Using the demonic energy to break all the ice, it caused his shirt to explode. Revealing all that was underneath it.

They could see scars covering his torso and arms, the body was carved out of pain.

Akeno almost had tears seeing the proof alone of his pain, Sirzechs couldn't even fathom what this single boy went through. No one had any words, Kalawarner and Raynare looked to Kai to see him sighing and closing his eyes.

"What are all those from?" Raynare screeched.

Everyone turned to him as he spoke softly.

"All his life, he has devoted himself to training. Fueled by his own rage towards his two species, it caused a whiplash effect and he pushed himself beyond his own limits. These are the results of his own training, the training he put you two through was nothing compared to what he put his body through, it took pure determination to keep going. Any normal person would of gave in on the first day." He said.

Everyone turned to the fight suddenly as Issei started to speak in a apathetic tone, completely uncaring anymore.

"I've underestimated you, I will not do it again. This is when I draw the line, no more playing around." He said loudly.

Everyone widened their eyes as they heard him.

Riser didn't seem to take the warning in his tone.

"I see you've managed to survive that attack, even if you have some incredible ice abilities, this is the end!" He shouted.

His flaming wings grew brighter as he sped towards Issei with his fist reeled back. He was moving faster, Issei mused he was using his wings as a speed boost. However Issei wasn't going to let that get to him at all.

He quickly sidestepped the fist as Riser went soaring past him.

"You may have increased your speed, but it is nothing compared to my ability to dodge and my own reaction time." Issei said quickly.

Riser was just getting angrier and angrier that this boy was making a fool of him.

"DIE!" He shouted as he charged again.

Issei chuckled and quickly summoned his demonic sword and swiftly sliced the arm off as Riser came close to him, Riser instantly grabbed the stump of his arm as the flames roared to life.

He laughed as his arm healed instantaneously.

"Even if you can dodge, you can't beat the immortal Phenex!" He shouted arrogantly.

Issei just shook his head.

"You Phenex's aren't immortal at all. Not even the gods themselves are immortal. No one is truly immortal, everyone who has said they were immortal has found out otherwise. You in your case have your regeneration. The simple way to kill you would be holy elements, but I don't want to do that. There are other ways to kill a bird, and your about to feel my true power." Issei said suddenly.

Everyone was silent after hearing that, up in the v.i.p area, Lord Phenex was laughing his ass off.

"This boy thinks he can kill a Phenex?" He asked foolishly.

Serafall just shook her head.

"I think you should watch the battle and you will see your own limits." She said.

He shut up after that and turned back to the fight with a smirk.

Everyone was confused as to why Issei didn't end it, he kept letting Riser regenerate his limbs he would cut off, and the cycle would continue.

"Kai? What's Issei's deal? What's he planning?" Kalawarner asked suddenly.

Everyone looked at Kai as he looked in thought.

"It seems that Issei is using the Phenex's regeneration to his advantage." He mused.

Serafall didn't know what he meant by that.

"What do you mean? That would be counteractive wouldn't it?" She asked quickly.

He nodded then began to explain.

"For a normal fight yes, however this is Issei were talking about. Look at the battlefield, he was using the Phenex's regeneration, due to the high intensity of the heat it gives off to melt the ice and produce a ton of water." He explained.

Kalawarner and Raynare's eyes widened.

"So he is gonna use that?" They asked quickly.

Kai nodded.

Serafall wondered what was going on.

"What's he planning?" She asked.

Kai chuckled and explained again.

"He is going to use the water as a conductor, with his lightning he could fry the man with a well placed bolt of lightning." He explained.

Everyone's eyes widened for the umpteenth time that day as they watched the fight continue.

As Riser charged foolishly again, Issei was almost ready to prepare his attack.

Quickly dodging another punch he lunged and shoved his sword through Riser's shoulder, he then pivoted on his foot and threw him over his shoulder and on to the ground.

He pulled his sword out of the downed body of Riser, Issei smirked as he saw the flames come alive again as Riser started to regenerate. He looked around to see enough water for his plan to work. He was suddenly brought out of his thoughts as Riser spoke.

"Try all you want, I'll just regenerate any damage you can dish out." He said arrogantly.

Issei shook his head and chuckled.

"You truly are an idiot aren't you?" He asked.

Riser blinked, then he got furious.

"WHAT?" He roared.

Issei looked blandly at him.

"You've failed to take note of the area around you, there's about 2-3 inches of water here." He said.

As he said that, everyone's eyes widened as they knew now that Kai was right and something big was coming.

"Ya? What's that supposed to mean?" Riser asked ignorantly.

Issei raised one arm and started to speak again.

"A little science lesson, what conducts electricity?" He mocked.

Riser's face grew in horror as he watched the small black ball of lightning form on Issei's hand, it started to grow steadily until it was the size of a softball.

With one swift and decisive motion, Issei clenched his hand around the sphere and aimed it at the ground. A large lightning bolt struck the surface of the water and started to spread like a wildfire.

Riser didn't have a chance to escape from it. He quickly fell on the ground with a charred body, however only a few flames covered him for a few seconds, but he still couldn't move

"WHAT? Why can't I move? My regeneration should be working." He shouted.

Issei chuckled and walked up to him.

"Your regeneration would only apply to physical wounds such as cuts, severed limbs and stuff like that. However the stuff on the inside doesn't get affected by your regeneration, so you have to regenerate those things naturally. To keep it short and sweet, your regeneration has limits. It has just found it's limit your nerves are fried from the inside, my lightning bolt made sure of that." He said quickly.

Up in the v.i.p room, Lord Phenex was horrified at the scene before him.

"H-How is this possible?" He asked dumbstruck.

Serafall laughed loudly.

"That boy has just proved your own clan's arrogance on thinking your immortal, he just proved you wrong. Maybe that will tune down your arrogance!" She said as she laughed.

Sirzechs nodded as she spoke. They had expected this outcome, however they didn't know that something even bigger was coming.

Back at the fight, the two of them just stared at each other. Riser was in disbelief at how easily he lost.

"How does someone like you have this kind of strength?" He shouted furiously.

Issei shook his head and spoke.

"All you brats think your top shit just because you got everything handed to you on a fucking silver platter. That isn't strength, no true strength is gained from blood, sweat, tears and pain. All I know about my parents are their names! I'm a fucking orphan! The closest thing I have to a parent is my guardian, and yet I didn't get anything handed to me! I earned it all through years of gruesome training, this body is a testament to that fact." He shouted in fury.

Everyone was silent as they heard him. Riser just blinked and started to laugh like crazy.

Up in the v.i.p area, Kalawarner and Raynare were sad as they heard Issei, but it soon turned into fury as they heard Riser's laugh.

Kai's face darkened as he knew if Riser were to say a single thing wrong, it would be over. They all listened as Riser started to speak.

"I refuse to believe a nobody like you has this kind of strength! You should just crawl back into the hole you came from peasant! No wonder your parents gave you up! They most likely didn't love you at all." He sneered.

The whole arena became eerily silent as the words of Riser sunk in, Kai paled as he knew what Issei would do now. He quickly stood up.

"You have to stop this now before it's too late!" He shouted quickly.

Everyone turned to him in alarm as he said that. Lord Phenex was the one to speak up.

"Why stop now? It's obvious Riser is just getting started!" He said foolishly.

Kai shook his head as Serafall spoke up.

"What is going on? Why does the fight need to be stopped?" She asked quickly.

Kai sighed and began to explain.

"I'm sure you know of Issei's rage and it's capabilities?" He asked quickly.

Suddenly everyone who knew of Issei's true identity faces grew in horror.

"What does this have to do with anything?" Lord Phenex asked arrogantly.

Kai looked at him deadly serious.

"There are very few things that make Issei go into a blind fit of rage, one of those things just happen to be talking bad about his parents. His parents are a very complicated subject to him, and with Riser saying that they didn't love him. He basically just forfeited his own life." Kai explained.

Everyone was shocked.

"Bah! There's nothing that boy can do that could kill my son!" Lord Phenex said foolishly.

Kalawarner and Raynare walked up.

"How bad will it affect him?" They asked.

Kai shook his head and spoke up.

"It will be a massacre, we're talking barely any restraint on his demonic form. Riser won't be able to withstand what he unleashed." He said.

Suddenly Akeno spoke up.

"Anything we can do to stop him?" She asked.

Kai just shook his head, they were about to suggest something else when they felt it.

A massive release of energy.

"WHAT IS THAT!?" Lord Phenex screeched.

Kai glared at him.

"That's the beast your son has unleashed upon himself." He said.

Everyone looked to see a gigantic swirl of black and red energy, Riser was knocked back by the massive amount of energy that was being released. Suddenly everyone heard screams of rage from inside the swirl of energy.

As the energy finally disappeared, they were shocked at what they saw.

Issei in his half demonic form.

"That's Issei?" Serafall screeched.

Kai nodded.

Everyone looked at the newly partial transformed Issei, he had the same demonic hands they'd seen before, but it was on one side. Half of his body was like that, he had one horn atop his head in the form. It seemed he would have two of them when he went full demonic.

"What has my son unleashed?" Lord Phenex asked horrified.

Kai looked at him seriously.

"His worst nightmare." He said simply.

They all turned suddenly as a demonic voice interrupted their ears.

"I'LL KILL YOU!" It was Issei, but it was more demonic and animalistic.

Riser feared for his life now, he was suddenly picked up and slammed against the ground several times. He was then launched into the air, and a massive bolt of lightning came towards him.

As he felt down, his gut was met with Issei's demonic fist. It sent him flying into a pillar.

He was already coughing up blood as Issei came towards him.

"S-Stay away!" He screamed.

However that didn't do anything as he was grabbed again.

"You want mercy? YOU DON'T DESERVE IT!" Issei roared.

Riser's pummeled body was slammed mercilessly on the ground several times before he was chucked in the air again, this time he was hit with a roundhouse kick, sending him flying in the other direction.

Back in the spectator room, everyone was watching horrified at the destruction of Issei's anger.

"What do we do?" Serafall asked suddenly.

No one had any answers.

Akeno had tears coming out of her eyes at seeing Issei. She quickly rushed wanting to hug him and calm him down, however she was held back by Sirzechs.

"Don't, you would only become a casualty." He said.

Kai suddenly looked at the girl.

"Let her go, she may be the only one who can bring him back." He said.

Kalawarner and Raynare eyes widened.

"I thought you said that no one would be able to do that?" Raynare asked.

Kai chuckled then explained.

"Yes I did, however it seems this girl is the one who was the cause of Issei's recent behavior. She may be able to calm him down." He explained.

They widened their eyes as Akeno spread her own wings and flew down to the arena. Everyone else hoped that she would be able to bring him out. Akeno herself still didn't understand her feelings for Issei yet, however she knew she cared for him. It also hurt her to see him like this.

As she landed behind him, she quickly dashed towards him and gripped him in a bear hug.

At first nothing happened. They all watched with bated breath.

"Issei! Please listen to me, this man isn't worth the effort it would take to kill him. I know your in pain, come back where everyone is waiting for you, so we can help you!" She shouted with tears in her eyes.

Suddenly Issei moved, and he collapsed on his knees.

If anyone were in front of him, they would see a tear roll down his face.

Suddenly something happened, the demonic energy was replaced with it's opposite.

Holy.

Akeno had to force herself not to let go and get away, suddenly his wings released, and everyone was shocked. The wings were different though. The angel ones didn't have a speck of red on them, they were all a deep blue, and the devil ones seemed to take on the appearance of fallen wings mixed with dragons. They were covered in a deep blue glow as well.

However that wasn't what shocked them.

It was the matching halo floating above his head.