I've went back and fixed up the story so that it could flow much better. I've also fleshed out the fighting and grammar with the help of my beta. HERE WE GO

Prologue: A Devil Kings Tale

Devils creatures were feared throughout the history of mankind. It was said, that the man who saved the human, dragon, and gods from Zeref was a Devil. Devils, contrary to popular belief, looked more like humans and gods, rather than their other counterparts; the demons. The only difference, being a sharp tooth or a horn hidden within their body. However only the purest blooded devil looked exactly human.

Keron the devil king was known for his manipulation of Yin and Yang magic. This power was the root of all magic, including water and fire. Both of these elements were both destructive yet it could create new life as well. In 300 years Zeref had made all creatures; Gods, Humans, Dragons, and even Devils bow down to him, yet only one stood in his path and opposed him, the Devil King Keron.

He, who did not fear Zeref was declared a fool by his brethren who then were later destroyed. However he obtained the power of the creator. Yin and Yang, the magic of creation, the magic of destruction. This caused magic to reflect in his eyes. Eyes of peculiar one of red and one of blue. With his unique powers he was strong enough to match and face The Lord of Chaos, Zeref. To create a world of peace and stability for all species to live together in harmony

…...for now.

(Keron Vs Zeref)

A man stood face to face with his enemy.(Imagine Keron exactly like Madara when his is in his sage of six paths form) He was wearing a graceful white and black garb with 6 orbs floating behind him. Three were red and three blue glowing orbs. His red and blue eyes flared intensely staring down the lord of darkness in front of him.

"So….it has come to this." Keron whispered as a trident appeared in his left hand and a katana in his right. The sword was beautifully decorated as the blade was black and the hilt red. The trident's staff part was all white and the tip of each point was coated in a blue aura.

"You want to fight me? Even gods and dragon alike have fallen to my hands."(Zeref can be left up to your imagination) Zeref yelled, and the heavens roared as his chaos magic began flaring around his body. "Chaos Lords Screech!" A purple like energy shot out from Zeref's mouth which split the earth that it had traveled above of. Keron then began to weave in a spinning motion when he came to a stop the weapons flared and he shot out a blast of black and white energy.

"Devil Secret art: Shadowed Light!" The blast was equally as strong and met Zeref's attack head on. It proved to be a stalemate, however as both beams exploded and caused the landscape to change. Zeref frowned upon this but then switched to a creepy grin. He would finally have a challenge. He realigned his gaze, then he saw a glittering red light. Suddenly out of the smoke Keron appeared with only his Katana, he brought down on Zeref who blocked it with a longsword. He saw that Kerons red eye was glowing fiercely.

Keron landed and pushed his blade forward forcing Zeref back. Zeref then thrusted his blade forward only for Keron to sidestep it. Keron then quickly spun around as his katana became coated in silver flames - the signature color of a devils magic.

"Hellfire of the Fire Devil!" Keron brought his katana down to cut Zeref in half, but instantly Zeref was able to parry it with his longsword and hold it. Zeref grinned, however he rose an eyebrow when he saw that Keron grinned as well. Suddenly a huge silver flame engulfed Zeref causing him to scream out in pain.

Kerons blue eye began to glow as his Katana disappeared and was replaced by his Trident. He then spun it around in a circular motion, then jabbed the trident forward. "Surging wave of the Sea Devil!" A pure stream of silver water materialized and started to form what seem to be a drill and slammed right into the inflamed lord of chaos.

"Is that all you can do?" Keron widened his eyes as Zeref appeared to be unharmed. Furthermore his body was emitting a black smoke and his eyes were glowing purple. "I guess it's my turn." He charged towards Keron who unequipped his weapons. Keron who now saw the determined Zeref, clenched his fist and drew out the last of his might. Black and white energy alike poured out around him. He charged towards the Chaos Lord.

"Devil Secret Art: Fist of Yin and Yang!"

"Chaos Lord's Dread Fist!"

The two collided, a powerful shockwave spread throughout the entire world engulfing it in a white and black energy...

Balance had finally been brought back to the world.

Chapter I : Black and White

(400 Years Later)

It was a dark day, as clouds hover above a mansion. The earth rumbled, as a woman with scarlet hair who was in labor surrounded by her servants screamed as she gave birth. Signs of weariness and unrest, became the aura around the house, as two strong cries were heard. The twins were born with large magical reserves. The older one Ryu had red eyes and the younger Shio had blue eyes along with hair as dark as the night. The woman held her children and gave them their first command.

The mother whispered a grim hymn to her sons. The older son let out a stream of white fire engulfed four servants as they screamed in agony. the younger son let a beautiful stream of water and sliced through the other four servants as the fell silently. Tears dripped from the weary mother. She distinguished the dead servants that were secret followers of Grimiore who wanted to obtain her sons.

"I don't have long left in this world, but I will always love you two." She kissed her sons on their foreheads as she her magic soon began fading from this world. Thunder roared and screams were heard outside of the mansion. The door slammed open as a man came running in. His right eye was red and his left blue eyes. This was the Devil King and the twins were his children. He quickly ran over to his wife and put his hand on her face.

"My love, take care of our boys and make them strong." He kissed her on the forehead.

"I will my love." He said as his wife faded from this world. She was human and couldn't take the strain of the birth. He picked up his two sons one of which was crying this was Shio the younger brother, as the older brother Ryu was resting in silence.

He could feel it, that the heirs of the Devil King would be able to one day change the world.

A darkness was coming and his sons would be in the center of the whole predicament.
He had no choice but to prepare them for the oncoming disaster.

(13 Years later)

Shio jumped to the side with his trident in his dominant left hand. As his older brother swung his Katana downward in the opposite. White flames engulfed the area when the blade touched the ground. Shio jabbed his trident forward sending a wave of silver water as well. Ryu upon seeing this, dodged with a backflip.

They wore the same face but had different eyes. One with dark red and stoic eyes, the other with open and wide blue eyes. Shio grew out his hair into a curly ponytail. Ryu kept his hair unkempt and short.

"Damn it Nii-san!" Shio yelled as he jabbed his Trident forward only for Ryu to stop it with the blade of his Katana.

"You might want to try harder Otouto!" Ryu forced the trident to the side as Shio stumbled a little, and then used the momentum to spin and slam the trident into his older brother. Ryu however saw this coming and stopped the blade of the trident with his katana. They both suddenly jumped back as they unequipped their weapons.

"Breath of the Fire Devil!"

"Breath of the Sea Devil!" A stream of silver water smashed into silver fire. A steam then engulfed the area. Ryu's piercing red eyes flew around, scanning the steam, and then waiting for his brother to make a move. He knew his brother would attack first due to his nature, his blue eyes appeared not too far in front of him.

"Sea Devils Tidal Kick!" Shio came in fast with a dropkick intended to hit his brother. Ryu expected this and sidestepped his attack while doing this he raised his right leg which became coated in silver flames.

"Fire Devils Axel Kick!" Ryu slammed his foot down and as it was about to connect with Shio, who dissolved into silver water. Ryu watched as the water moved away from him and reformed back into Shio and it went a far distance. Ryu frowned at this, because they were still new to using their Devil Elemental. He decided to play along as well and turned into a silver fire before Shio had realized it.

Along the sidelines, Keron the Devil King was watching as silver flames and silver water collided. He was sitting down with his arms crossed observing his sons. He had red japanese armor on and long black hair. His sons had separately inherited his powers of water and fire. The part that confused him was who inherited what.

Shio, the younger brother who was reckless and bold had inherited the power of water. This confused him due to that fact that water is the calmest element of the main five elements. Yet he used the power of water as if it was nothing and was on his way to become an excellent Sea Devil Slayer.

Ryu, the older brother who was calm and collected had inherited the power of fire. Once again he wondered why? Fire was an element based on ones rise in emotions and was the most destructive of the elements. However he used his white flames even better than his younger brother used his water. He would be a great Fire Devil Slayer.

The boys had been born in the year X763(two years older than Erza) it was currently the year X776 and he had a whole year left with his sons. He broke out of his stupor and stared at his two sons who were still fighting. Ryu was clearly more skilled however Shio's nature made him hard to read, but of course skill over recklessness. Then Shio suddenly was knocked down by the bottom of Ryu's handle.

"You always give me a good challenge Otouto(Younger Brother)." Ryu said as he helped his little brother onto his feet. Shio began rubbing the back of his head sheepishly.

"It is time!" Keron yelled as his sons quickly kneeled before him. He snapped his fingers as a beautiful sword appeared in his right hand. A sheathe as black as night with flame decorations. His left hand held a trident of which the handle was also as dark as night. The tips of the trident were blue and had a blue cloth tied onto the bottom part of the blade.

"These are going to be your new weapons. I will also teach you two how to use devil king magic from now on." His sons will defeat Zeref when he rises again just like he did so many years ago. He had one year before he would fade from this world. However he knew his sons would be just fine.

"Hey Tou-chan." Shio said as he changed his position and sat down on the ground.

"Yes…..?"

"Can we eat first?" Keron the great demon king, the one who defeated Zeref face faulted. He should've expected this. Well he was hungry anyways and he could tell Ryu was as well.

"Very well let us go into the next town and find something to eat." The demon king said as his sons got up.

(20 minutes later)

Humans were okay as long as they didn't get on his nerves. It was an uneventful night, but Keron couldn't help but feel like something was wrong. He could smell black magic in the air somewhere. After a good meal, he sons he decided that they would check it out.

"Ryu, Shio, can you feel that evil power." His eyes began to shine and so did his sons as they could feel the dark energy. They walked toward a beach and Keron waved his hands in a motion to split something. The sea began to split. He turned to his sons.

"Follow me and use the speed technique." A sonic boom resonated and in the blink of an eye their father was gone.

"Devil art: Sound Ceremony" The two boys said as two sonic booms resonated.

(In the tower of heaven, a small fair girl with beautiful red hair holds a dying old man in her arms)

"Rob-Jiji! Don't die!" Erza said as she shaked Rob. Suddenly a boy who was around her age appeared. He had red eyes and was holding a katana.

"Come." The boy said as Erza shook her head.

"Go, Erza." She looked down at Rob who was dying. He then looked over at the boy. "Please take her somewhere safe. Take her to Fairy Tail."

Ryu nodded and grabbed Erza by her hand and made a run for it. He had split up from his brother and his father when he felt magic come from this girl.

(Keron top of tower)

Keron could feel the presence of him. He could feel Zeref trying to enter this world once again. A boy with blue hair charged him and he merely backhanded the boy putting him down for now. Then a black energy charged towards him.

"Zeref! You will not be revived not yet!"

"Ahhh, Keron the devil king. Can you still defeat me? You have grown past your prime." The dark energy known as Zeref flared intensely and began to laugh.

"You dare to jest me Zeref?"

"You, can no longer use Yin and Yang magic. How will you defeat me when I return?" The energy then shot towards Keron.

"Zeref, you shall not pass!" Keron brought out his hand and shot out a blast of white and black energy. "Devil Secret art: Shadowed Light!" The blast went onward and ripped through the black energy.

"Keron, you cannot stop me forever I WILL RETURN! You are almost gone! I can feel it! Your power is leaving you!" The tower began to shake around Keron and he quickly turned around to find his sons.

Shio jumped to the left and impaled the chest of a guard with his trident. Soon four other guards appeared. He then swung his trident in a circular motion as water appeared and sliced through all the guards. He turned his head as he heard guards screaming and on fire.

"Breath of the Sea Devil!" A condensed stream of silver water blasted out of Shios mouth and ripped through the guards nearby his brother. Ryu turned towards his brother and saw a bunch of guards appear behind him.

"Otouto! Duck!" Shio upon hearing this planted himself onto the ground. "Breath of the Fire Devil!" Ryu yelled shooting out a stream of silver flames engulfing the guards.

"Nii-san!" He then looked over at who was with his brother. It was a girl with an eye patch and…..she was holding his brothers hand. Her red hair stood out even more.

"Haha. You guys are in LOOoooOOoVeeee!" Shio said as his brother bonked him on the head. The girl's face burned bright red like her hair.

"Who's that?" Shio said as he stopped playing around.

"I'll explain later. Where's Chichiue." As soon as he finished that sentence the floor above them exploded as their father landed on the ground. He looked over at them and then the girl and rose his eyebrow.

"Who is she?"

"I'll explain later Chichiue." Ryu said as Keron nodded and grabbed ahold of the three kids. In a sonic boom the three of them were gone. Then the tower began to collapse.

(later)

"So you promised a dying old man that you would take this girl to a guild called Fairy Tail?" Said the father. Ryu nodded and introduced as the girl known as Erza.

"What's a guild?" Shio asked as he tilted his head to the side.

"It's a community of humans that can use magic." Keron said as he looked over to the little girl who stayed behind Ryu.

"Your name is Erza right?" He said as she nodded. "Then let us go I want my sons to learn to keep their word as well."

"Ummm."

"Yes?" Keron said as his intimidating gaze made her cringe a bit.

"Why do you refer to the guild as if you aren't human?" Erza said as Keron realized his mistake. If the world had learned that his sons were half devils things would be difficult.

"I meant to say people, but I misworded." With that Keron turned around and walked towards the town where Fairy Tail was. He remembered meeting one of their masters long ago. Her name was Mavis he believed.

He looked over at his son Ryu who was still holding hands with Erza. He could feel her emotions and he knew that she felt safe when she was with Ryu. Also for some odd reason he kept thinking about this guild known as Fairy Tail. It bothered him to the point where he stopped in the middle of the road and rubbed his head.

"Let us rest for now. Tomorrow we will get a boat." With the snap of a finger 4 sleeping bags and a appeared. He moved his foot in a circular motion where he was standing and grabbed a couple of twigs and threw them in that area. He then looked at his son Ryu who nodded and lit the flames.

"Have you eaten yet?" Ryu asked Erza as she blushed and shook her head. Shio who was watching this began laughing silently to himself. He was shut up however when his dad gave him a warning look.

(15 minutes later)

Ryu handed Erza a cooked fish. She looked at him and he nodded his head telling her it was okay to eat. She slowly took the fish and began eating. They ate in silence as Keron stared intently at Erza. Suddenly a sword appeared in his hand, It was a standard long sword however it had a red hilt.

"You can use magic so I want you to take this sword." Erza had a surprised look on her face. She really didn't expect them to give her something. It was a sword, she always wanted to learn how to use a sword. The blade was three feet long and was not heavy at all!

"I modified this blade so you can use it freely. Also since you are currently my responsibility not just my sons, I need to give you something to protect yourself." Also he wanted to do something about her eye. It was also because this little girl resembled his late wife.

"Lift up your eye patch." Keron said as Erza did so. He reached towards her empty left socket, she was going to ask what he was doing, but he rose his other hand to calm her down. "Art of creation." Once he muttered these words Erza noticed that she could see!

"I...I...I can see." Erza said as tears began falling down her eyes. Keron gave a half smile as Shio gave a toothy grin. Ryu had a smirk on his face with his eyes closed.

"Thanks Oji-sama." Then curled into a ball of embarrassment and bliss.

Keron looked surprised at this and changed his face to that of a warm smile.

He snapped his fingers and she was suddenly dressed with new apparel. (the armor she wore when she was younger. You can find it by typing in young Erza in google images)

(The Next day)

"Ryu, we will wait here take Erza to Fairy Tail." Keron knew that the girl had began holding his eldest son in high regard. Ryu didn't understand why his father told him to drop her off, but he was okay with it.

Magnolia was a huge town with just about everything. Ryu led Erza to the supposed place where Fairy Tail was located. He couldn't help but notice Erza's hair bouncing around sneaking glances toward the pastry store.

He let out a sigh. He figured he wouldn't want to waste to much time, but agreed to occupy her anyways.

"Want... some?" He let out a small voice.

She turned around as her eyes glowed with excitement. Then retracted her emotions and began walking away. He then grabbed her by the hand. She feels a shock run up her back.

"It's okay…" he muttered. "I don't mind." She turned around, and tears began to run down her eyes.

Such warmth she thought, as Ryu's hand gripped tightly. A child of only eleven years old crying without letting out a sound. Ryu couldn't understand why she was crying at all, but couldn't help but let her be.

"It's okay, it might not be whatever you want, but whatever it is, I'll to get it for you."

She looks at his eyes. Such a strong and yet caring gaze. A low soft tone, full of grace and hidden compassion. "You promise?"

"Yeah…" Ryu wasn't sure what he was saying anymore…"I'll promise to always."

Tears begin to overflow Erza's face, she lets out a loud and deep cry. As if the cries she had held in were opened. Ryu, astonished didn't what to do. He hugged her tightly as possible hoping she were stopped crying. It seemed timed had finally stopped for Erza, yet it time had also finally began.

"In this world wherever there is light there is darkness as well. As long as a concept of winners exist there must also be losers. The selfish desires of humans and their fear of death create something even worse. They create slaughter and torture so it can be feared more than death. You and your brother must eliminate the darkness in this world." Words of his father echoed through his head.

Her cries reminded him of his mother, who had longed for love she would've had for her sons. Her cries reminded him of the times when he wanted to cry, but so dearly held onto strength.

Her cries reminded him of the person he would've been. If he wasn't born a devil.

(A little later)

A while after she'd stopped crying, they stood in front of the pastry shop, headed toward the Guild known as Fairy Tail.

"You're coming along, right?" she asked Ryu as he nodded his head .

"You promise? Pinky swear?" Her hair flowed in front of his eyes, covering her bright red face. He looked at her in confusion. He didn't understand this concept of humans.

"Promise?" Little did he know that this promise sent out a ripple of events that would change the world.

She held her hand as he held his in response. Her little pinky reaches and grasps Ryu's tender palm. Ryu's face becomes red hot as he cannot understand what's going on. He extends his little pinky and they hold it firmly together.

"A promise it is, teehee" She turns and laughs. Ryu tries to hide his face even though she isn't looking.

(In front of Fairy Tail)

"You're not going with me?" Erza looked at Ryu at disbelief

"I have to go somewhere…" Erza look at Ryu with more disdain and disbelief, he felt that she may cry again.

"But your promise!" She then turned around and ran towards the guild doors holding her tears. Ryu looked down onto the ground. He didn't know if he could keep that promise. He ran towards her and caught her by the hand.

"I can't be with you right here and right now, but someday i'll come back. Like I promise. Along with my brother, I won't leave you here.." Ryu wasn't blushing or embarrassed anymore. His eyes were filled with confidence.

"As I promised… I'll get you whatever you want, but i'm going to have to take my time."

Erza gasped and wanted to let out a word, but she couldn't let it out. As Ryu turned around to leave, he felt a warm embrace wrapped around him. He felt a warm, blazing fast rhythm beating out from his back. He felt as if his chest would burst open. Erza let out her last words to him as he left.

"See you again…Ryu..." He felt her warmth leave as he heard doors open along with the many laughters close behind him.

"She'll be alright… right?" He asked somewhere in his heart.

"Lighten up! We can keep that promise man!" A familiar voice came to his mind, and his red cloak flutters in the wind while laughing.

"I'll be home soon…to you."

SO yeah...I've changed the story and the writing to make things better so I hoped you guys liked it!