Hello all Storm here with a new story! Once again it's another idea I believe hasn't been done before, and I hope you all enjoy it. So, without further ado.

I own nothing

Rosemary Village, a small and relatively quiet village that was out of the way of any major towns or cities. For this reason, Rosemary made for a good target for Dark Mages to attack, such as what was happening at this very moment.

The village had been attacked out of nowhere by Zeref Cultists, Dark Mages that worship the Black Wizard Zeref and sought to revive him. The cultists goal was to capture and enslave people from different villages and send them to the Tower of Heaven to force in completing its construction. Their most recent target being Rosemary Village, where they have already kidnapped several people and were now destroying the village to cover their tracks and rounding up any stragglers.

One such straggler was a seven-year-old girl who was coughing from the smoke of her village burning around her. The girl had shoulder length scarlet red hair, pale skin, and ocean blue eyes.

This girl was Naruko, no last name, and she is searching around for someone.

"Erza! Erza, where are you?!" Naruko shouted, worried and fearful that she couldn't find her sister.

She didn't know where anyone was, having been separated from her sister and their friends, Simon and his little sister, Kagura.

Naruko still couldn't believe this was happening, it had been just like every other day until suddenly Dark Mages and started capturing people and destroying the village. She had been with Erza, Simon, and Kagura when the Dark Mages attacked and had gotten separated during the chaos. Now she's trying to find Erza but couldn't see anything through the smoke and flames.

"Hey there's another one!"

Naruko paled when she saw three of cultists seeing her and without hesitation she turned around and ran away from them. She didn't want to run and abandoned her sister and friends, but what could she do? She's just a kid who doesn't have any magic or knew how to fight, all she can do is run.

Running into the forest, Naruko quickly climbed up a tree and hid herself from her pursuers. She heard their footsteps close by, making the girl shiver in fear at being discovered, but after a while she heard the steps fade away. Though she didn't climb down, still terrified of being discovered.

It made tears appear in Naruko's eyes that she couldn't do anything, for all she knew Erza and the others could have been captured or killed and here she was hiding like a coward, instead of trying to do something.

At one moment, Naruko thought she fell asleep and somehow stayed in the tree rather than fall out. But when she woke up, she saw the smoke was mostly gone and she could no longer see the glow of the fire. Slowly, Naruko climbed out of the tree and ran back to her village only to be horrified at seeing it completely destroyed.

Walking around the wreckage, Naruko looked around for any signs of anyone or if the Dark Mages were still here.

"Simon! Kagura! Erza!" Naruko called out, hoping they had managed to escape as well.

But after searching the entirety of the destroyed village and finding no sign of her sister or friends, Naruko's head fell as she wiped away the tears falling from her eyes. She didn't know if they were alive or dead, and now she was alone.

*Timeskip-Five Days*

Naruko walked through the woods, not having any particular destination in mind, and an empty look in her eyes.

After seeing her home destroyed, along with not knowing what happened to her sister, either having been killed or captured, Naruko had just left without looking back. She hasn't eaten or drank anything for several days, she tried hunting or foraging; but she didn't know how and thus simply kept walking.

Her entire body hurt from walking as well as lack of nourishment and sleep, given whenever she closed her eyes all she saw were the dead bodies of her sister and friends, all of them looking at her accusingly for running away like a coward.

'I'm sorry.' Naruko thought, filled with sadness and self-loathing.

Though suddenly Naruko heard footsteps coming towards her and soon a shadow was cast over her. Looking up, Naruko gulped when she saw probably the most intimidating man she's even seen.

It was a muscular young man with long, dark blue colored hair. He carries a sharp gaze; his eyes were a blue color, along with having black circles around them. He is dark-skinned, and on his body, he had strange blue markings. His attire consisted of a high collared, black cloak possessing the same blue markings on his body, sharp claws around his neck, a sash around his waist, a gold arm ring tightened around his right upper arm, and baggy pants which are decorated with the same blue markings.

What terrified Naruko was just how coldly he looked at her, like she was about as important as a speck of dust. He wasn't even glaring, just his mere presence and the magic he had radiating off of him made Naruko feel like she was suffocating. Even if Naruko wasn't a mage or trained to use or sense magic, she could just feel the power he contained.

Naruko was unable to say or do anything, afraid that even the slightest movement would make the man lash out.

Acnologia regarded the little girl in front of him blankly. He had been resting in the nearby mountains, far away from humans and any other creatures, when he sensed something that made him immediately transform into his dragon form and take flight.

He sensed a Dragon or Dragon Slayer, and he was going to kill them.

But now seeing this girl now, he idly wondered if he had gotten rusty after isolating himself. As this girl was obviously no Dragon or Dragon Slayer. And yet he could still smell the scent of a Dragon on her and sense her magic was similar to a Dragon Slayers, but she clearly had no training in Dragon Slayer Magic or even seemed aware of it herself.

Though this didn't really concern Acnologia and he planned to just kill the girl, anyway, given he swore to eradicate all Dragons and Dragon Slayers. But something stayed his hand.

It wasn't pity for the girl's weak appearance, looking like little more than skin and bones, with dark circles under her eyes. Acnologia did smirk though when he saw the fear in her eyes, even in his less recognizable human form, he can still strike fear into humans. But yes, it wasn't pity that stopped Acnologia from killing her, he's slaughtered thousands of men, women, and children in his four hundred years alive, what would matter adding one more corpse to the pile. What stopped him though, was something that made his smirk widen.

The girl's potential. She clearly had a connection to Dragons, perhaps the child of a Dragon Slayer, and thus she'd be even stronger than other Dragon Slayers, given she was born with Dragon Slayer Magic. With the proper training she'd make for a powerful mage.

A mage powerful enough to finally give Acnologia the challenge he desires.

Yes, that would be a much better idea. He'll train this girl to become a Dragon Slayer, one that'll surpass all others, and when she's learned everything he has to teach, once she reaches the peak of her power, then they will fight. It will be the challenge Acnologia craves, one that will finally push him to his limits, but if she proves to be unable to provide him a challenge than he'll just kill her, like he's done with all Dragons and Dragon Slayers he's encountered.

Either way, Acnologia wins.

His mind made up, Acnologia turned around and started walking away.

Naruko unconsciously released the breath she had been holding when the man started leaving. Though she immediately froze when the man stopped and turned a little looking at her, before jerking his head, motioning her to follow him. Gulping, Naruko ran up and began walking beside the man, while she didn't know him or his intentions, something told her if she didn't follow him, he'd just kill her and be on his merry way.

*Later*

Naruko sat in a clearing, nervously fiddling with her hands. She had been walking with the strange man for not even an hour when they stopped in a clearing where he told her stay until he returned. Well he didn't actually say that, he just pointed at the ground and then walked off into the woods without looking to see if she actually did what he said.

It was already night and Naruko was wondering if he'd just left her there. Though not a moment later, Naruko heard footsteps and tensed up only to see it was the man, but she was shocked when she saw him carrying a large dead boar on his shoulder like it was nothing.

Wordlessly, he dropped the boar on the ground and, to Naruko's amazement, created a large fireball in his hand and threw it at the boar. After a few moments, the man swiped his arm through the air and creating a strong gust of wind that extinguished the flames, revealing the cooked boar.

"Eat." Acnologia commanded, sitting down and pulling off a chunk of meat and throwing it at Naruko

Catching it Naruko looked at it hesitantly, knowing she could get sick if the meat wasn't cooked all the way. But given she hasn't eaten in several days, Naruko didn't really care and dug in.

It was bland, tasteless, and really bitter, but Naruko didn't care since it was food either way.

"Tell me girl, what would you do if you could use magic?" Acnologia asked as Naruko ate, causing her to stop momentarily as she looked at the man, thinking his question over.

'What would I do… if I had magic?' Naruko thought while looking down sadly.

If she had magic, she would have protected her friends and sister from the Dark Mages. But she didn't and now for all she knew, Erza was dead, her twin sister.

Their entire lives Naruko and Erza lived in Rosemary Village, they never knew their parents, if they were alive, if they were dead, if they even wanted them. But that never got them down as they had each other, they were family no matter what. And now she was gone, her only family was taken from her.

'All because of those damn Dark Mages!' Naruko thought, her sadness being replaced by anger as she thought about the ones who took everything from her.

They never did anything, the people of Rosemary were kind, and yet they were attacked and enslaved by those bastards! Her home, her friends, her sister, everything was taken from her!

All because they wanted to revive the Black Wizard, Zeref.

Clenching her fists, Naruko looked up at Acnologia, who raised a brow intrigued by the anger in her gaze.

"If I had magic, I would hunt down and kill every single Dark Mage in the world. I would find every demon, artifact, anything related to the Black Wizard Zeref and destroy them all, until not even the memory of Zeref was left. Anyone that would seek to revive him, I will hunt them all down and kill them!" Naruko swore with anger lacing her words.

That was her goal now, to become strong enough to kill all Dark Mages, she'll do what the Guilds and Magic council refuse to do and wipe out the Dark Guilds from all of Earthland. She won't stop, she'll make sure that Dark Mages can never hurt innocent people again.

It'll be their turn to be afraid and beg for mercy. Mercy that she won't give.

And for those that worship Zeref, those that seek to revive him, she'll make them suffer a fate worse than death.

Acnologia's interest increased as he sensed the girls anger and hatred, along with feeling her inner magic flare up. It made the Dragon King smirk, yes, this girl will definitely provide him the challenge he seeks.

Her anger will fuel her strength, even more so when he tells her the fact Zeref is alive and can't be killed. If she grows strong enough to be able to kill the immortal Black Wizard, then she will truly have proven herself a worthy challenger.

'Perhaps even a worthy heir to my throne.' Acnologia thought idly.

That is if she's able to kill him before he kills her.

With that Acnologia got up and sat against a tree, before closing his eyes.

"Eat and then go to sleep. We'll be starting your training at dawn." Acnologia said.

"Training?" Naruko asked confused, Acnologia opening an eye to look at her in annoyance at the question.

"Yes, you say you'll wipe out all Dark Mages and all memories of the Black Wizard. I can give you power to do that. Now be quiet." Acnologia said, not planning to answer all the questions she asks.

This shocked Naruko, this guy was going to train her, just like that? Naruko wanted to ask why, what exactly made her so special that he's willing to train her?

Though while she wanted to ask why, Naruko thought it might better to hold her tongue, since she had feeling this guy wasn't helping her out of the kindness of his heart.

For now, she'll accept the training and hope he'll actually make good on making her strong enough to wipe out all Dark Mages.

After eating more meat, Naruko laid on the ground and after a while managed to fall asleep.

*Timeskip-Twelve Years*

Twelve years have passed since Naruko lost her sister and home, only to be found by Acnologia.

The next morning after she first met him, he started training her immediately, first unlocking her magic and then started training her in his Dragon Slayer Magic. His own type of Dragon Slayer Magic was also one of the most powerful, it was Ethernano Dragon Slayer Magic, Acnologia's element was magic itself.

Meaning that Acnologia could devour all types of magic rather than just a specific element, he could use every type of Dragon Slayer Magic, and could absorb the Ethernano from the atmosphere to use his attack. But what made Acnologia's magic truly dangerous, was the fact that it allowed him to reap the souls of Dragons the he's slain, not only killing them but taking their magic for his own.

It was with this power that Acnologia was known as the Black Dragon of the Apocalypse and the Dragon of Magic.

Anyway, that had been the only easy day of training, every other following day was torture and agony filled.

Acnologia proved to be a slave driver, not taking it easy on her at all as he showed her how to perform his magic. He only showed her an attack once and then told her he wouldn't show her another until he felt she could perform it at an adequate level; by his standards, mind you. It'd take weeks, sometimes even months, for her to master a spell and for Acnologia to teach her a new one.

Besides training her in his magic, Acnologia also physically trained Naruko, given she also needed a strong body. This is where Acnologia truly showed his sadistic side; every morning at sunrise, he came up and have her do a thousand sit ups, pushups, pull ups, and run a hundred laps. Though she never once complained about the hellish training, knowing each night she went to sleep, her body screaming at her to stop, she knew it was another day closer to achieving her goal.

A goal that now included hunting down and killing Zeref, after Acnologia told her that the Black Wizard was still alive and immortal. This only fueled Naruko's anger, that Zeref was alive and hiding somewhere, while Dark Mages kill and enslave people in his name.

Once she deals with all the Dark Mages and Zeref's demons, then she'll kill Zeref as well; even if he's immortal, she'll find a way to kill him.

Acnologia also didn't make it a secret that he's only training her to provide him a challenge and that if she failed to give him a good fight, he won't hesitate to kill her. This didn't really affect Naruko, it only gave her another reason to become the strongest.

Naruko also became skilled at hunting and trap-making, these weren't things that Acnologia taught her, but they were necessary in order to eat. Given how Acnologia told her if she wanted to eat then she'll have to do it herself, he had only done so when they met as it'd be counter-productive if she wasn't at her best when her training started.

After eight years, shortly after she turned fifteen, Naruko had finally completed her training under Acnologia. She learned and mastered all his attacks both for his Ethernano Dragon Slayer Magic along with other types of Dragon Slayer Magic. With her training done, Acnologia had left Naruko on her own.

Since then, for the past four years, Naruko has hunted down Dark Guilds and wiped them all out, not hesitating in killing all members. They all tried fighting her, thinking they could defeat a lone mage, but they soon learned she wasn't an ordinary mage. Some of the Dark Mages, after seeing her tear apart their comrades, tried running but she easily hunted them down and killed them. A few even tried begging for mercy, only to die like all the rest.

She kept good on her desire of killing all Dark Mages, she took an especially sadistic pleasure in killing those that worshipped Zeref. Their screams were music to her ears.

Though her actions haven't gone unnoticed, with Rune Knights having tried to apprehend her and bring her before the Magic Council to answer for the Dark Guilds she's wiped out. Naruko of course didn't do this, not wanting to waste her time with fools that only sit around all day and act like they're important. She didn't kill the Rune Knights, merely crippled them when they tried forcing her to go.

This proved to be a mistake, deciding to cripple them instead of killing them, as not even a week later she had been labelled a Dark Mage herself. That nearly made Naruko want to go and slaughter the Magic Council at daring to throw her in with the same type of people use magic for their own gain. She's the one who's wiping out Dark Mages and keeping people safe. The only reason she didn't is because they honestly weren't worth her time, if they wanted to make her the villain then it's a path she'll gladly follow.

Besides it's not like anyone has seen her face before, no one alive anyway. They also didn't know her name and instead gave her a title, "Tiamat, the Dragon Goddess".

Currently Naruko was in Hargeon Town, having sensed a Dark Mage that was located there. That was something else being an Ethernano Dragon Slayer granted her, being able to sense "evil" aura within people along with the darkness in people. It made hunting Dark Mages easier, along being able to replenish her power by devouring "evil" aura.

Naruko has also grown and matured in the past twelve years. She had grown into a beautiful young woman, her red hair had grown out to her waist, and she had a narrow and voluptuous figure. Her attire consisted of a black sleeveless mini dress that hugged her large bosom with a white collar and a red tie, a red belt that has a red side skirt cover, long black socks and black boots, red gauntlets and black gloves.

She also had a sharp gaze like Acnologia that helped to ward off anyone that tried approaching her.

Sniffing the air, Naruko growled as she smelled the Dark Mage. Following the scent lead her to the docks and a large yacht. Sensing the Dark Mage on the ship made Naruko grimace, the one downside of Dragon Slayer Magic was the motion sickness.

Stepping onto the ship, Naruko groaned and steady herself on the railing, even if the ship wasn't moving, she still felt sick just by being on it. Another downside, the stronger the Dragon Slayer, the worst the motion sickness.

A small price to pay, to have the power to wipe out Dark Mages.

Once she managed to calm down her stomach, she searched the ship for the Dark Mages, having sensed more than one, she went down to the lower sections. Reaching the lower floors, Naruko found something that pissed her off beyond all measure.

It was a group of Dark Mages with cages scattered around the room. What pissed Naruko off was the cages were filled with young girls.

'Slavers.' Naruko thought enraged.

These were the Dark Mages she hated the most, just as much as Zeref Worshipers, as it was these types of Dark Mages that took her sister from her. Before she was just going to kill them quickly, but now, they're going to suffer.

Summoning a black cloak and a white faceless mask that had red tear-markings below, as well as above, the eyes from a Requip space to hide her identity, Naruko ignited her arms with dark blue fire, finally catching the attention of the Dark Mages.

"Inferno Dragon Iron Claw!" Naruko said, swiping her flame covered hand at the Dark Mages unleashing claw shaped flames.

The flames crashed into the Dark Mages leaving painful third degree burns on their bodies. The lucky ones died moments after, the unlucky ones were currently screaming in agony.

"You! You're gonna pay for attacking Bora of Prominence! Prominence Whip!" Bora shouted, creating a Magic Seal that released a number of curved fiery beams of purple fire that launched towards Naruko with each beam branching off in a different direction to strike at her from different angles

Naruko only gave them a glance before holding up her hand and pulled the purple fire towards her. The fire gathered in her hand and then to the shock of Bora, the flames were being absorbed through the mouth of her mask, she ate the fire.

"Wh-What?!" Bora shouted in shock at seeing her eat the fire, all while Naruko smirked, since she had some runes placed on her mask to allow any magic to harmlessly pass harmlessly through the lower part of it, straight to and out of her mouth.

"Your flames taste bitter. Now be burned by hellfire trash. Inferno Dragon's…" Naruko started as she leaned her head back before throwing her head forward unleashing a torrent of flames.

"… ROAR!"

Bora only had a second to scream in agony before his entire body was reduced to ash, along with the rest of the Dark Mages that were still breathing.

Cutting off her attack, Naruko smirked when she saw nothing was left.

Inferno Dragon Slayer Magic was one of the styles of Dragon Slayer Magic that Acnologia had taught her. Unlike normal Fire Dragon Slayer Magic, an Inferno Dragon Slayer's flames burned much hotter and anything or anyone that touches them are guaranteed to be burned to ash. While their deaths may have been quick, they certainly weren't painless as the split second before they were turned to ash, every single cell in their bodies was being burned.

Turning to the girls still trapped in cages, Naruko saw most of them shivering in fear of her, understandable given her attire and that she did just burn several people alive, without a shred of guilt.

"Titanium Dragon Sword." Naruko said, turning her arm into a titanium sword with spikes that began rotating like a chainsaw.

Swiping her arm, Naruko destroyed the cages, while getting a few screams of surprise.

"All of you go." Naruko ordered, with the girls being more than happy to get off the ship.

Once all the girls were gone, Naruko took off her cloak and mask before leaving the ship as well, stopping once she reached the dock and turned towards the ship.

'Now just one thing left to do.' Naruko thought.

Opening her mouth, Naruko and began devouring the Ethernano in the air.

"Apocalypse Dragon's… ROAR!" Naruko said while unleashing a blast of pure magic that eradicated the ship and cut a path through the sea.

Once the ship was completely destroyed, Naruko stopped her roar and turned to leave, satisfied at having eliminated a few more Dark Mages. However as she left, Naruko heard one of the girls she saved call out to her.

"Thank you Titania!"

Naruko continued walking since they were far enough away to not really make out what she actually looked like. Though, she did raise a brow, not sure why she said that or thinks she's this "Titania" person.

'Who the fuck is Titania?' Naruko wondered.

So, what did you think, hood. Yep Naruko is not only Erza's twin sister but has been found and trained by Acnologia himself, though not because the Dragon King was feeling generous but to see if Naruko can provide him a worthy challenge in the future. Not only that but rather than giving her Apocalypse Dragon Slayer Magic or Black Dragon Slayer Magic, I made it so Acnologia's magic is Ethernano Dragon Slayer Magic, given he's called the Dragon of Magic and when he's used his roar it looked like he was absorbing the magic in the atmosphere, it'd make sense that Acnologia wasn't restricted to a single element and instead could use all of them. Also Naruko will still call them "Apocalypse Dragon's…" attacks since that sounds cooler. Naruko's attire is also based off of Akame's from "Akame Ga Kill" while her cloak and mask are Akiza's from "Yu-Gi-Oh 5D's". So, review if you liked go away if you didn't.

Storm out