Atlantica

The coordinates for Atlantica locked in.

This world was different. There was no landing pad, no solid ground to anchor the Highwind. There was only an endless expanse of blue, shifting and churning under the light of a distant sun.

"World physiology: Aquatic," the ship’s computer droned. "Transformation protocol initiated."

I stood in the airlock. I didn't need a spacesuit. The magic of the world order would handle the rest. I pressed the release button. The airlock hissed, and I dropped into the void.

I hit the water hard.

The impact should have crushed me, but instead, it enveloped me. The moment the ocean swallowed me, the change began. It wasn't the soft, sparkly transformation Sora had described. It was visceral.

My legs fused together, the bones reshaping, thickening, lengthening. My skin hardened, losing its human softness and gaining the rough, sandpaper texture of shagreen. Muscles surged in my back and shoulders, expanding to power a body designed for hydrodynamics.

My neck flared open. Gills. The first breath of water was cold, sharp, and exhilarating. It tasted of salt, minerals, and life.

I opened my eyes. They adjusted instantly to the gloom, a nictitating membrane sliding back.

I looked down at myself. I was no longer human. My upper body remained humanoid, though broader, greyer, and rippling with dense muscle. My fingers ended in sharp, black claws. Fins protruded from my forearms, serrated and stiff.

But below the waist... I was a monster of the deep. A massive, powerful shark tail stretched out behind me, dark grey on top and pale white underneath. A dorsal fin sliced the water above my lower back. I flexed the tail, and the sheer power of it propelled me forward thirty feet in a single heartbeat.

I was a Great White Merman. An Apex Predator.

I checked my equipment. The Solar Zenith Keyblade appeared in my hand, but even it had changed, looking more jagged, like coral and bone.

I scanned the area. I was in a bright, colorful reef, teeming with life. Schools of fish darted away from me in a panic. They sensed what I was. They smelled the predator in the water.

But one creature didn't swim away.

Peeking out from behind a large purple fan coral, watching me with wide, fascinated blue eyes, was a mermaid.

Ariel.

She was stunning. Her red hair floated around her like a halo of blood in the water. Her green tail flickered nervously. She was wearing her signature purple seashell bra, which did little to hide the soft swell of her full breasts.

She was staring at my teeth.

I swam toward her. I didn't paddle; I glided, my shark tail moving with lazy, lethal grace.

"You can come out," I said. My voice sounded different underwater, deeper, vibrating through the liquid. "I can smell your curiosity."

Ariel hesitated, then slowly swam out from the coral. She kept a safe distance, her eyes darting to the sharp fins on my arms and the rows of teeth visible when I spoke.

"You're... you're not from here," she said, her voice melodic and sweet. "The sharks here don't talk. And the mermen don't look like... that."

"I am a visitor," I told her, hovering vertically in the water. "My name is Ray. I'm a Keyblade Master."

"A Keyblade Master?" Her eyes lit up, the fear replaced by intrigue. "Like Sora? He was here! He helped us fight Ursula!"

"I know. But I am not Sora. I am... here for another reason."

I swam a tight circle around her. She turned with me, watching my tail. I was assessing her, not just as a potential ally, but as a creature. She was soft. Fragile. Her scales were smooth. She smelled of sweetness and ocean currents. My shark instincts flared, a desire to chase, to bite, to dominate. I suppressed it, but only just.

"Why are you here?" she asked, looking at the jagged Keyblade.

"The ocean has changed," I said. "Can't you feel it, Princess?"

Ariel’s expression darkened. She hugged herself, looking down at the dark abyss that dropped off at the edge of the reef.

"Yes," she whispered. "The currents... they're getting cold. And the fish are disappearing from the lower trenches. Daddy says it's just the seasons changing, but... I've seen things. Shadows."

"Heartless," I diagnosed. "But not the ones you know. These are adapted to the crushing pressure of the deep. They are corrupting the water itself."

I stopped in front of her.

"I am going to hunt them," I declared. "And I'm going to purge the trench."

Ariel looked at me. She saw the danger in my form, the grey skin, the dead-black eyes, the teeth. But she also saw the confidence. She was a girl who longed for more than her safe, protected life. She was drawn to the dangerous unknown.

"I can help," she offered impulsively. "I know the reefs better than anyone. I can show you the way to the drop-off."

"It's dangerous, Ariel. I am a shark. Where I go, blood follows."

"I'm not afraid," she lied, though her heart was beating so fast I could sense the vibration in the water. "I want to see. I want to know what's out there."

I smiled, revealing the full horror of my serrated grin.

"Very well. Lead the way, Little Mermaid."

She turned and flicked her green tail, shooting forward. I followed, my powerful tail propelling me effortlessly in her wake. I watched the sway of her hips, the way the water moved over her skin.

We swam away from the light of the palace, heading toward the darker, colder waters. The hunt had begun.