A Shingeki no Kyojin fanfic weaved with elements from Greek Mythology. The idea just sort of clicked in. I hope you enjoy!

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The Immortal

Unknown to them, she might just be their biggest chance of winning against the titans. But her role is to be in the shadows, never making herself stand out. They must never, ever know. Who she truly is. Where she's from. What she is.

Because there is but one rule: An Immortal must never leave a mark in history.

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PROLOGUE

The entirety of Olympus was in chaos when the news spread. Zeus was angered, resulting to the dark, murky skies that rumbled throughout the heavens. Everyone was distraught and in utter disappointment.

"You even dare?!" A loud, booming voice echoed throughout the whole court. The wrath of the god was evident across his face. "What in the name of Olympus has gone inside your head and gave you the idea of unleashing the titans?! This is, by no means, not the time to end the world!"

A man with long, dark hair and obsidian black eyes glared up at the other sitting in front of him in his grand throne. "You disgust me, brother." He spat, struggling under the weight of the hands that held him down. "Why do you show so much affection to those wretched creatures? They're nothing but useless insects that crawl and slowly destroy the world."

"Humans are our creation, Hades. Despite that, they play a big role in our power. If they were permanently to be wiped out from the face of the world, we will be the one who shall face the consequences!"

"Just admit that with rate of mortality that resulted, it is you who will benefit. It isn't like he relies on the lives of human to gain power. He relies on their deaths." Ares spat.

"Enough."

"You should not underestimate humans," Athena, the Goddess of Wisdom, told them. "From my observations, their innate instincts will pave way for their success in survival—although the chances are minimal."

Zeus sighed. "We cannot undo the past. Since you are the wisest, Athena," he paused. "What is your suggestion?"

"Humans are weak and very fragile creatures. They cannot win against the titans by themselves."

"What should we do?"

"We must aid them." Said Athena. "Though it goes against our rules not to interfere with human activities, the root of all this chaos is our brethren so we must aid them with one of our own in return. Do you not think that's fair?"

"You plan to send down one of us to aid them in their battle? The titans will not be easily conquered. Even we before had had trouble of trying to put them in prison."

"We will help them when needed." Athena said. "But we stay here on Olympus. Let one god correct the mistakes of another."

They all looked down the floor, where images of the chaotic world below were shown before them. The gruesome deaths of billions of people, all the cause of the swarming army of monsters that ravaged the land. It was hard to believe that these monstrous creatures were their brothers. They were but mere, mindless beings with no other purpose than to wipe out the human race. They were not to be used until doomsday. There was no way they would back down until the very last of humankind was killed.

"Who do we send down?" Zeus asked.

"I believe that Apollo's daughter is suitable."

At the mention of his own blood and flesh, a man with bright blond hair walked forward, his blue eyes narrowing. "You plan to use my own daughter to correct the mistakes of that horrid excuse for a god?! She's not even in proper age to engage into battle!" His tone bounced off the marbled walls of the palace, ringing with anger.

"Calm down, Apollo."

"Hear me out, you fool." Athena waved him off. "I'm saying that she is suitable considering her age. She will undergo proper training and preparation for the time that she faces the titans and help humankind."

"I will not allow it!"

"What is the harm in doing so?" She growled. "You do not have to fear the safety of your daughter. Only a god can kill another god! Her immortality will prevent her from dying in the midst of the battle."

"That is not the point!"

"Then what? She will bring glory and fame at her success. We are depending on her to save the humankind, and therefore save us as well."

"She . . ."

"Agree, Apollo." Zeus said. "She is our only chance."

"Can I not go in her stead?" He asked.

"I believe the idea is ridiculous." Athena said. "She is a much better choice."

Apollo seethed. "I know what you are all thinking! You are all planning to use her as a form of entertainment to lighten up your boring lives! I am a god as well, so do not even dare think that I cannot see through your charade!"

Every god within the room eyed him.

"What are you talking about?" Athena huffed. "She is young and a fresh new bud blooming. Does that not give you the reason to choose her as the best candidate to become the messiah?"

"Enough!" Zeus's voice boomed. "In order to settle this argument, why don't we let the girl choose for herself?"

Hera, the wife of Zeus, stood beside the man and placed a hand on his shoulder. "I agree."

"Then, bring the young goddess here at once! Hermes, go get the girl!"

A particularly young-looking god with curly hair saluted him and made a dash for the open doors. His speed was as quick as a lightning that all the other gods caught was his afterimage. In a few minutes, Hermes came back with a small girl sitting inside his arms. The soft, black hair that resembled a raven's wings rested on her shoulders, long, straight, and glossy like silk. Her eyes had a hint of brown under the sun, but normally dark under proper lighting. They were big, doe-like, but seemed wiser beyond her years.

"Aristea," Apollo muttered.

From a momentary display of shock, her expression was quickly replaced by anger. "I said put me down!" She yelled, wiggling stubbornly inside Hermes's arms.

Hermes quickly obeyed and set her down on the ground.

Athena chuckled. "Such a little spitfire, isn't she?"

"Young goddess," Zeus formally addressed.

Aristea took in the sight of Hades being restrained against his own will before addressing Zeus with her eyes.

"What?" She crossed her arms, frowning.

Zeus cleared his throat, somewhat offended by the girl's lack of proper respect. "I called you here to let you decide."

"Hmph."

"Look down."

Aristea reluctantly obeyed and looked at the big circle on the floor containing the images of what was currently happening on Earth. "Earth?" She stared at it dubiously. "What happened to Earth?"

"The titans were unleashed unintentionally." Zeus made an unnatural emphasis on the last word. "If something is not done soon, humans will cease to exist."

She glanced back at the god. "So? What do I have to do with that?"

The other gods and goddesses could not help but raise their brows at Apollo's daughter.

He sighed. "We are planning to send you down to Earth to aid humans in battle against the titans. If you are able to do so, you'll come home with glory and we will honor you. By the combined powers of all the gods in Olympus, we will grant you a wish as well."

Aristea thought for a moment.

"Don't, Aristea. It won't do you any good." Apollo told her.

"Will I be able to use my abilities?"

"You are allowed to, yes. But you cannot let the humans know of it." Zeus answered tiredly.

"Why not?" She insisted.

"Because you are an Immortal and we all follow rules as gods and goddesses of this realm. The first rule regarding to never interfere with human activities is out, since a god himself caused the chaos currently happening on Earth. There is but one more rule left to abide by if we cannot prevent ourselves from not interfering, and that is to never leave a mark in history."

"Some kind of undercover job?"

"Why, yes. Somewhat."

"Battle with titans . . ." She mulled.

"Aristea—" Her father started.

"Alright, I accept."

"Wha—"

Athena smirked victoriously.