A/N: I've wanted to make this story for a while now, the only real issue I've had was coming up with a good opening to tie the characters into the world. After several rough drafts, I think I have finally come up with the one that works well enough.

Disclaimer: I do recommend watching Symphogear first, as the events of this story will be relative to what happens in the original story. On the other hand, I also recommend watching or playing Fire Emblem fates, as some of the events of it's revelation route will be referenced to. Lastly, I do not own either Symphogear or Fire Emblem.

Without further ado, enjoy!

Prologue:

Yato, The Fate-defiant katana

Castle Gyges Throne room

"Your Majesty?" A man with silver hair in a Nohrian butler uniform enters the room, followed by a man in a set of foreign armor, unseen by Hoshido, Nohr, or Valla. "This man says he requires an audience with you. Though, it sounds rather suspicious considering his attire is unfamiliar. Should we trust this?" The butler added, making sure to keep his concerns between himself and his King.

The King couldn't help but chuckle at his servant's usual unsociable nature to others. "Come now, Jakob. Surely this man doesn't mean us any harm. Though your concern of his origin is understandable." The King faces his guest and bows respectfully, "Pardon my butler, he can be rather overprotective at times. Regardless, it's a pleasure to meet you. I am King Corrin of Valla. and you are?"

The guest bows, clears his throat, seeming to struggle to speak at first, "Greetings Your Majesty, I am Enki. I apologize for my sudden visit, but I am in need of assistance from one such as yourself, one who has defied fate." The King is reasonably surprised by this statement, but allows the man to finish his request before commenting. "The world in which I come from faces a threat by someone of godly power that I once bested, but I fear that she may return and I require the assistance of someone who has the power to change their fate."

Corrin thinks aloud to himself, "Even almost a decade later, I never would've imagined that the death of Anankos would travel as far as other worlds, but in a way, I'm also not too surprised that it has." Corrin pauses, as to nostalgically remember the day the Hoshidan and Nohrian royalty came together with himself and Azura, but then turns back to his guest, "But I'm afraid I may not be able to help as I have to help the people of Valla first and foremost."

"Papa!" A young voice called out, running into the throne room, followed by a small blue, white, and red-colored dragon lying atop a special orb. "What if I went to help them? Thanks to you and the others, I should be more than able to handle myself in combat!" The girl then realizes in her excitement, that she failed to properly introduce her self and curtsies to Enki, "Sorry for my sudden entrance. My name is Kana, Princess of Valla."

"I don't know Kana." Corrin says, addressing her daughter's request, "Sending you to some unknown world alone? I'm not sure if it's safe to send you off on your own yet, let alone a entirely different world." Corrin continued, showing concern for his daughter's safety.

Kana was feeling a bit sad about her father denying her request to help Enki, but suddenly, the dragon spoke up,"What if I went with her, Your Majesty? If I went with her, I'd be able to get her to a fortress in the astral plane and get her out of danger immediately."

"I guess with someone like you there to help her Lilith," The King thought aloud, "I'd be more comfortable sending her. My one concern is how the people of that world would react to seeing you. There's a good chance Astral Dragons don't exist there."

"Leave that to me, Your Majesty." Enki spoke, before walking over to Kana and Lilith, "I shall provide them a more human form as so they shall not stick out too much outside of combat." He said, raising his hand towards Lilith, engulfing her in a bright light.

Once the light dissipated, the dragon was replaced by a woman with blue and red hair dressed in a blue gown with a white overlay with a matching white hood and brown over-the-knee boots. Everyone, including Lilith, was in awe at the sight of Lilith back in her human form after so long. "Incredible! Thank you so much for this, Enki!" Lilith said, quickly bowing respectfully.

"No thanks necessary, Lilith. However, if I am to send you both to that world, you will need a power to fight the noise." Everyone in the room looked at Enki confused by the name of this mysterious "Noise" enemy. "Allow me to elaborate. Noise are an ancient man-made enemy of which, once in direct contact with a human, turns itself and its prey into carbon and disintegrate instantly." The confusion in the room was instantly replaced with that of shock and slight fear. "But there is a way to defeat them: using ancient relics or, as discovered in recent years by humans, special crystals created from broken relics known as 'Symphogears' that once a special phrase is chanted, grants the user their own armor and a weapon that allows them to come into contact with the Noise and destroy them without worry of carbonation." this slightly calms the room.

"So, are you giving them one of these 'Symphogear' relics to use in this other realm Enki?" Corrin asked, " Or perhaps do you plan to provide them with relics?"

"No and yes," Enki answered, "I plan to provide them with a power to fight the Noise, yes, but it'll be slightly different from the normal relics of said world. That being said, may I borrow the Yato for a moment?" Corrin hesitates at first, confused as to what he plans to do, but then hands him his sword. "Trust me, I have no ill-intent for this sword. Now then, Kana was it?" the young princess nods, "Do you have any kind of crystals or stones that can hold special power within them?"

Kana was a bit confused by the question at first, before realizing what he might be referring to, "Oh! You mean like a Dragonstone?" Kana asked, "But what do you need my Dragonstone and Papa's sword for?"

"No need to worry," Enki reassured Kana, "I am going to some of my power alongside giving your Dragonstone a power similar to that of the Yato. This shouldn't take but a moment." Enki raised his hand like he did for Lilith, and within a moment, Kana, her Dragonstone, and the Yato were engulfed in a similar light. When the light dissipated, Kana was wearing a set of armor similar to her normal attire. The only major difference was the disappearance of her normal blue scarf she wore around her neck. In its place, there was a light blue stone with golden accents. In her hand where she held her Dragonstone was that of a sword similar in shape to the Yato, but it was white with blue and gold accents and various spots to where something could be placed.

Shortly after, she was engulfed by another light and found her self in her normal clothing, but the Dragonstone in her hand still bore those golden marks as it did on her breastplate. Handing the Yato back to Enki so he could return it to Corrin, she couldn't help feel like a kid in a candy store with the power she was given, "Thank you Mr. Enki! With this power you've given me, I'll be sure to save as many people as I can!" Enki and Corrin chuckled, happy to see the excitement in her eyes.

"I already gave my power to Lilith when I restored her human form, so she should be more than ready on that front." Enki stated, as to reassure Lilith, "Though I should mention, while I have given you a new power, you are still more than able to access your natural dragon form when in that transformation. I'd suggest putting your Dragonstone on a necklace under your scarf so that you can have it with you at all times without worry of drawing attention to it." Kana nods.

"Allow me to do that for you before you depart, Princess Kana." Jakob says, getting a "Thank you" look from Corrin.

"When you two are ready, come meet me out front." Enki says, "I shall give you time to prepare." Enki left the throne room and went to wait as he promised.

Kana's Chambers

"Are you sure you will be alright in this new world, Kana?" Corrin asked his daughter, making sure she is certain that she wants to follow through with this, "This place might not be anything like Valla, let alone Hoshido or Nohr."

"Papa, you worry to much," Kana responds, teasing her worried father, "I mean, sure it'll be a place I have no clue about. But thanks to you and everyone else, I'm more than capable of defending myself out there." Seeing her father a bit saddened to see Kana leave on her own, let alone at such a young age, Kana goes to hug her father, "Besides, if I'm anything like you Papa, I'm certain that I won't allow myself, Lilith, or anyone die so easily." This managed to cheer up Corrin somewhat, chuckling at the remark of his stubbornness during the war. "So don't be sad that I'm leaving, be happy that I'm helping people who are in need." She says, giving her father a big smile.

"I'm amazed that you're taking this so well, Princess Kana, and at such a young age too." said Felicia, a pink-haired maid who was helping Kana pack up some things to bring into the Astral Plane.

"If I'm being honest, Miss Felicia, I'm terrified of leaving Papa and the others. But I think the thing that's keeping me from breaking down from the fear, is that I'll be saving people, just like my Papa!." A proud smile appeared on Corrin's face as well as a few tears of joy, seeing his daughter happy to follow in his footsteps.

"Lady Kana," Lilith said, appearing from the doorway, "Enki and I are ready to head into the Astral Plane when you are. Come meet us outside so I may take us there." Lilith turns to Corrin, "And there's no need to worry about us too much, Your Majesty. I'll make sure we both come back safely!" Corrin thanks Lilith, and with her message delivered, heads to the front of the castle to meet up with Enki.

"I'll be right there, Lilith!" Kana replied, getting the last of her stuff together and heading for the door when she was suddenly stopped by a hand on her shoulder.

"Kana," Corrin says to Kana, a hint of sincerity in his voice, "Make your Papa proud." Kana couldn't help but cry tears of joy, turning to embrace her father in one last hug before she departs.

Wiping the tears from her eyes, Kana says to her father, "I will Papa, I promise!" with their last goodbyes said to one another, Kana heads to the front of Castle Gyges, saying goodbyes to everyone on her way, and meeting up with Enki and Lilith. "I'm ready!" she announces to the two. They nod, then Lilith opens a portal to the Astral Plane that herself and Kana would be calling home for the next few years. Before entering the portal, Kana looks back at Castle Gyges, nervous to leave her father, family, and friends. But at the same time, finds the courage within herself to step into the portal and start a journey she wouldn't soon forget.

In the Astral Plane

Upon exiting the portal, the three are met with a fortress about the size of Castle Gyges' throne room. Outside of it, there were a few smaller buildings that stored various resources which, as a gift from Enki, would restore over the course of 1-2 weeks. Lastly, there was a training area, also another gift from Enki, so the two would be able to train and get stronger.

"I shall give you both some time to unpack your things into your base of operations, you will need to drop off any unnecessary equipment or belongings here as to not weigh yourselves down while traveling in this world." Enki tells the two, receiving a nod from both as they enter the castle to quickly unpack. Moments later, the two return to the front of the fortress.

"Are you both ready to depart?" Enki asked, seeing Kana and Lilith. The two nod, ready for whatever awaits them in this new world. "Before we leave however, I have one request." Enki says, handing a red crystal to Kana, "I am unable to enter the world with you as I will be using the last of my power to transport the two of you there, so I request that you give this to a girl by the name of Serena when you have the chance to. She will need that in order to assist you."

"Sure thing, Mr. Enki." Kana replied, "But who is Serena?"

"Serena Cadenzavna Eve, the wielder of the Symphogear Airgetlám, as well as my youngest descendant, will be in the facility I'm sending you both to. She will die if you are unable to get to her and get her out of there." This causes the two to be slightly worried. "Worry not, for your Yato Dragonstone should give you the ability to save her, that being said, I'd recommend transforming into that power before we depart." The two nod, taking out their respective Dragonstones, and transforming. Kana donning the relic's armor as Lilith dons a hooded cloak which has a similar blue and white color scheme to that of her normal attire with hints of red on various parts of the cloak.

"Thank you, Mr. Enki." Kana says to Enki, "We shall save not only this Serena, but the world you wish to save." Enki smiles, seeing the determination to save others, regardless of how scared she truly is inside.

"I can't thank you both enough for taking on this heavy burden. Lastly, I would highly recommend not mentioning our meeting as it may cause trouble for you." Enki says to them, earning confused but understanding looks from the two. With the last of his requests voiced to the group, Enki sighs, prepared to use his remaining energy, entrusting the future to Kana and Lilith. "Here goes! Best of luck to the both of you!" Enki says to the two, then raising his hand, and in a matter of seconds, the two are transported out of the Astral Fortress. "All that remains is to trust that they can save the world from her." Enki says, immediately falling down to the ground, exhausted. "Finé... I shall see you soon..." Enki draws his last breath and fades into nothing.

A/N: *Sigh* Thank goodness that's done! I was torn on how to exactly go about getting this scenario to properly work. First I was thinking having Miku from a doomed future come to transport them to the past, then having it be Anankos from another world, then having Finé do it, but the only one that worked for me was Enki (I plan to explain this a bit better when I reach XV in the story, but for now, this should hopefully suffice.)

Side note: Originally, I was going to have Corrin go with Kana alongside Azura and her son Shigure, but Kana's part in the story was the only one of the four I could really plan ideas for. Regardless, I hope you'll enjoy what I have planned for this crossover story in the future.

Until then, Feedback is appreciated and I shall see you in the next part!