FFXIV × Evangelion Crossover — Part 1: The Children of the Echo

Author’s note: This is a speculative crossover fanfiction blending Final Fantasy XIV and Neon Genesis Evangelion. The “Final Days” catastrophe is re-imagined as Second Impact. The Scions of the Seventh Dawn operate as NERV. The Warrior of Light is the designated “First Child.” All characters are used with respectful adaptation.

Prologue: The Impact That Shattered the Stars

The year 2003 was supposed to be ordinary.

Then Antarctica exploded.

The Final Days — known publicly as “Second Impact” — vaporized the southern continent. Half the world’s population perished. The climate shifted overnight. The very stars in the sky seemed to bleed.

Official reports blamed a meteor strike. Conspiracy theorists whispered about an Angel attack. Only a handful of people knew the truth:

The ancient being known as Zodiark had awakened. And the planet had fought back with its own life force — a being called Hydaelyn.

The two clashed in a battle that split the world into thirteen reflections. The Source remained. The rest became alt.earth — shattered, parallel worlds, each a fragment of the original.

But that’s not the whole story.

Chapter 1: The First Child

Limsa Lominsa — Maelstrom Headquarters — 2010

The boy arrived on a raft.

He was maybe sixteen, with hair the color of twilight and eyes that held a storm. He carried a crystal — a fragment of the Crystal of Azem — and a name that wasn’t his.

The Scions of the Seventh Dawn found him. They took him in.

They called him “The Warrior of Light.” But internally, in classified NERV jargon, he was “Childhood’s End.”

He was the First Child — the one whose soul contained the shards of multiple ancient beings. His Echo was not just a power. It was a synchronization interface.

He could merge with primal beings — the remnants of Zodiark and Hydaelyn — and control them.

The Scions didn’t tell him the full truth. They couldn’t. He was a weapon. A beautiful, fragile, deeply damaged weapon.

And they needed him to pilot.

Chapter 2: The Evangelions of Eorzea

The Scions’ base — the Waking Sands in Limsa — wasn’t just an inn. It was a NERV facility.

Deep beneath the city, in a cavern lit by aetherial glow, sat three units.

They called them “EVA” — Ethereal Vessel Armors. But they weren’t mechs. They were living beings — primal cores encased in artificial bodies made of aetherically-reinforced alloy.

Each was synchronized to a Child.

Unit-01 — “Calamity’s Echo” — synchronized to the Warrior of Light
Unit-02 — “Winds’ Rebellion” — synchronized to Thancred (Second Child)
Unit-03 — “Dawn’s Promise” — synchronized to Alphinaud? (Third Child?)

The interface wasn’t a cockpit. It was a sync chamber — the Child’s body immersed in a LCL-like fluid (actually aetheric solution) that allowed their soul to resonate with the primal core.

The Entry Plug inserted at the base of the spine — a neural interface that connected Echo to core.

Chapter 3: The Angels Are Not Aliens

The Angels were not extraterrestrial.

They were fragments of the Final Days — the scattered souls of the Ancients who perished when Zodiark and Hydaelyn clashed. They existed as conceptual entities, drawn to human hearts — to the LCL of Earth (the aetheric field that binds souls).

Each Angel was a missing shard — a being trying to reunite with the whole.

When an Angel appeared, it wasn’t an invasion. It was a homecoming.

But the world couldn’t survive another merging. The Scions understood this. So they deployed the Eva units to destroy the Angels — to prevent them from completing the Instrumentality that would merge all reflections into one.

The irony was not lost on anyone.

They were killing their own ancestors.

Chapter 4: G’raha Tia — The Commander

G’raha wasn’t just the Allagan genius archivist.

He was the Commander of NERV — the man who orchestrated the entire operation from behind the scenes.

His office in the Waking Sands basement had a massive screen showing AT Field readings across Eorzea.

He monitored Angel appearances. He scheduled Eva sorties. He authorized Dummy Plug usage — artificial Echo imprints that could pilot an Eva without a Child.

He was calm, collected, terrifyingly intelligent. And he carried a photograph of the Warrior of Light as a child — the only one they had.

He whispered to it sometimes:

“You will understand one day. That to protect this world, you must become a monster.”

Chapter 5: Y’shtola — The Misato Equivalent

Y’shtola wasn’t just a Scion. She was the Operations Director — the one who gave the launch orders.

She wore her Scion uniform like a military officer, but her eyes held the pain of someone who had seen too much dying.

She was the adult in the room, the emotional anchor for the Children. She taught them how to synchronize — not just technically, but emotionally.

“The Eva responds to your heart,” she’d say. “If you’re afraid, it will be afraid. If you’re angry, it will rage. Control your emotions, or the Eva will control you.”

She had once been a Child herself — Unit-00’s pilot — until an accident that cost her her sight (and her legs, replaced with aetherically-enhanced prosthetics). Now she directed from the bridge, her own Echo allowing her to sense Angel movements psychically.

Chapter 6: Thancred — The Second Child

Thancred was angry.

He had lost everything — his ability to use aether properly (courtesy of the Echo’s side effects), his freedom (kidnapped by the Ascians), his sense of self.

When they told him he was the Second Child, that he would pilot Unit-02, he laughed.

“You want me to get into that metal coffin? After what happened to me?”

But he had no choice. The Angels were coming. And only an Eva could stop them.

Unit-02 was different. It was wild — less controlled than Unit-01. It responded to rage better than calm. Thancred’s fury made it stronger.

But it also made it dangerous. During one sortie, Unit-02 went berserk, nearly destroying the entire city of Ishgard before Y’shtola ordered a forced shutdown.

Thancred never forgave himself.

Chapter 7: Alisaie & Alphinaud — The Third and Fourth Children

Alphinaud was the Third Child — quiet, brilliant, analytical. He synchronized with Unit-03, a support Eva focused on barrier generation and aetheric shielding. He didn’t fight much. But when he did, he was flawless — his precision allowed Unit-03 to create absolute defenses that could repel Angel attacks.

Alisaie was the Fourth Child — a late addition after Alphinaud’s accident during the Battles of Norvrandt, where an Angel’s AT Field collapsed Unit-03’s armor, leaving Alphinaud in a coma.

She was fierce, determined, angry at the world for taking her brother. She piloted Unit-04 — an upgraded Eva with dual core synchronization (she linked to Alphinaud’s mind while he was comatose). The system was experimental. It gave her precognition — flashes of future events.

But it also made her see visions of her own death.

Chapter 8: The Angels of Eorzea

The Angels had names, forms, and purposes:

Sachiel — appeared over Ishgard, caused aetheric storms. Defeated by Unit-01 using Progressive Knife (aether blade).
Shamshel — shaped like a tiger made of light, appeared in the Seagaze of La Noscea. Defeated by Unit-02’s whip (aetheric tendrils).
Ramasiel — a floating tetrahedron that emitted gravity waves. Fought over Camp Tranquility. Defeated by Unit-03’s shield.

Each Angel carried a Longinus-Spear equivalent — a glowing lance of concentrated aether. The Scions called them “Aetherial Lances” and collected them after each battle, storing them in a vault beneath the Waking Sands.

They didn’t know it yet, but those lances were keys — to the Final Days, to the Thirteenth, to everything.

Chapter 9: The Aether synchronization

The synchronization ratio determined how effectively a Child could pilot an Eva.

The Warrior of Light consistently hit >90% — unheard of. Their Echo allowed direct soul resonance with the primal core.

But there was a cost.

Each sortie eroded their sense of self. They would wake up with memories that weren’t theirs — glimpses of ancient warriors, Ascian faces, the sound of a great beast roaring (Titan?).

Y’shtola warned them: “The Eva is not just a machine. It’s a consciousness. And it wants to merge with you.”

One night, they dreamt of a man in silver armor — Lahabrea — whispering: “You are the final piece. When you become one with Calamity, the world will be reborn.”

They woke up screaming.

Chapter 10: The Calyx Incident

Calyx was not an Angel.

He was something else.

He appeared during the Rhalgr’s Reach incident — a researcher in a lab coat, accompanied by a stuffed animal that moved on its own.

He approached the Warrior of Light after a battle.

“You are fighting the wrong war,” he said, his voice distorted, digital. “The Angels are not your enemy. They are your ancestors. The Final Days were not a catastrophe — they were an evolution. I can help you achieve it. I can make you Endless.”

The Warrior refused.

Calyx smiled. “Then I will take what I need from you.”

That night, Unit-01’s core destabilized. The sync ratio spiked to 400% — the machine tried to assimilate the pilot.

The Warrior survived, but only because G’raha initiated an emergency core dump — jettisoning the primal core before it could consume the Child’s soul.

Calyx was captured. But he laughed as they led him away.

“You cannot stop the Winterers,” he said. “The Solstice is inevitable. And when it comes, everyone will become Endless. Even you.”

Intermission: The Mystery of the Winterers

Who were the Winterers?

Halmarut — the timid Au Ra Ascian — was one. She carried Calyx’s consciousness in a mu doll.

But there were others.

G’raha’s records showed five Winterers total. They operated in the shadows, manipulating events from the Foundation sector of the Ul’dahn undercity.

Their symbol? A snowflake inside a circuit.

Their goal? Not the Rejoinings. Not the destruction of the world. Something else — something involving the Fourth.

The Warrior asked G’raha: “What’s the Fourth?”

G’raha’s eyes went distant. “The Fourth Astral Era,” he said. “A time of ice and stillness. The Ancients called it the Great Silence.”

“Why would the Winterers want that?”

“Because,” G’raha whispered, “in stillness, there is no suffering. No death. No change. Just… peace.”

The Warrior looked at their hands — hands that had tempered primals, fought Angels, held the crystals of heroes.

Was that what they were fighting for? To stop evolution? To preserve mortality?

Chapter 11: The Fight That Wasn’t

The next Angel — the Seventh — didn’t attack.

It spoke.

It appeared over Mor Dhona, not as a monster, but as a figure of light — beautiful, terrifying, familiar.

It had Alphinaud’s face.

“Brother…” Alisaie whispered through the comms.

The Angel Extended a hand toward Unit-04.

“Join us,” it said, its voice a chorus of a thousand souls. “The Final Days can be undone. The Final can be restored. The Scions have lied to you. The Angels are not your enemies. They are your future.”

Alisaie’s sync ratio climbed — 95%, then 105% — she was fusing with the Angel.

Alphinaud, still comatose in the infirmary, began to mumble — his mind linked to the Angel somehow.

Unit-04’s armor cracked — glowing white light bleeding from within.

Y’shtola ordered a mandatory bailout.

But the Warrior of Light — First Child — stepped forward.

“No,” they said. “I’ll talk to it.”

They plugged into Unit-01 without a cockpit — just pure sync, their body merging with the Eva’s core.

They walked — not as a pilot, but as a ghost — toward the Angel.

To Be Continued…

The conversation with the Angel would reveal everything:

The true nature of the Final Days
Why the Ancients chose to shatter themselves into thirteen reflections
What Hydaelyn really wanted
Whether Zodiark was a tyrant or a savior
And what role the Winterers play in all of this

But one thing was certain:

The Scions weren’t the heroes.

They were the ones holding back evolution.

And the Warrior of Light — the First Child — had to decide: destroy the Angels and preserve a broken world, or let the Final Days happen and risk everything for a chance at true peace.

Either way, someone would die.

And the Evangelion would keep screaming.

Author’s Commentary (In-Universe)

If this were a proper crossover, the game mechanics would change entirely:

Limit Breaks become Sync Bursts — full synchronization with the Eva’s core for massive damage
Materia becomes S² Engine implants — you slot souls into your equipment
Primal fights become Angel engagements — the arena is the cityscape, not a pocket dimension
Job crystals would be Eva identity authorization chips
The Echo is AT Field resonance ability — rare, only in Children
The Main Scenario would be called “The Children of the Echo” and would span all 3.X–7.X patches, with the Evangelion plotline slowly revealed

But this is just a thought experiment. A “what if” that collides two of my favorite mythologies:

FFXIV’s hope-filled, found-family, light-against-darkness narrative
Evangelion’s brutal, psychological, parent-abandonment-meets-cosmic-horror story

The result? Something darker, more complicated, and ultimately more human.

Now if you’ll excuse me, I have to go listen to “Komm, süsser Tod” on repeat while crying about Shinji’s life choices.

Tiri

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