Reincarnated As Poseidon

The ocean had always been a realm of secrets, and not all of them belonged to the gods.

Far from the drowned cities, beyond the trenches that Poseidon now stirred with his awakening, there existed a region even the oldest sailors would not name aloud. The Abyss of Kharon. Its waters were black not from depth, but from curses laid over centuries. Ships that drifted too close would return empty, their crews gone, their hulls gnawed with strange sigils that burned faint blue at night.

And at the heart of it, within a cavern of coral and bone, the Sea Witch reigned.

Her throne was not carved from marble nor gold, but from the skeleton of a leviathan long dead. Its ribs arched high, hung with glowing anemones that cast pale, haunting light across the chamber. Around her feet crawled the Children of the Sea—not true children, but warped souls she had bound into scaled, half-formed bodies. They looked human from a distance, but their eyes glowed with unnatural green light, and their voices were hollow echoes of drowned prayers.

They sang for her. They worked for her. They were her slaves.

The witch herself was draped in kelp-darkened silk, her hair a river of black streaked with silver, floating endlessly around her head as though the sea bent to cradle her. Her fingers were long, webbed, tipped with nails like oyster-shell blades. Her eyes gleamed with the cold blue of abyssal fire.

They called her Nerissa of the Deep.

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Her Power

When she lifted her hand, the Children stilled. Even the water seemed to hesitate, holding its current until her gesture was complete. Nerissa smiled faintly. The ocean was old, and gods may have claimed dominion, but she had carved out her own fiefdom by binding what others had forgotten.

Spirits of shipwrecked sailors. Souls of drowned children. Remnants of sea-kings who had fallen in wars older than memory.

She fed on them. Bent them. Twisted them until they obeyed.

And with every soul she consumed, her power grew.

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Rumors of Poseidon

One of her creatures slithered close, bowing its head. Its voice rasped like shells grinding together.

"Mother… the tide shifts. The sea hums again. The drowned god stirs."

Nerissa's lips curved into a wicked smile. "So… he returns."

Her voice was neither young nor old. It was something in between, cracked like a ship's hull but smooth as rolling waves.

She rose from her throne, kelp robes trailing behind her, and moved to the edge of the chamber. Before her lay a great mirror of black water, rimmed by bones carved with runes. She brushed her hand over it, and images swirled—cities half-flooded, mortals praying in terror, and in the center of it all… a man whose presence bent the sea itself.

Poseidon.

His name carried weight even when whispered. But Nerissa did not whisper it.

"Poseidon," she said aloud, voice rippling through the abyss. "The god they buried in chains… the god who rises through mortal flesh."

Her teeth bared. "You return to reclaim your throne. But you will find that while you slept, I built my kingdom."

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Her Cruelty

She gestured, and two of the Children of the Sea dragged forward a young girl with silver hair and scaled ankles. Her wide eyes darted around the chamber as she struggled against her captors.

"No! Please! I only wanted to see my brothers!"

The witch's gaze flicked over her coldly. "Another stray caught in my nets."

The girl thrashed. "Let me go! Poseidon will save us! He will free us!"

For a moment, Nerissa's face stilled.

Then she laughed.

The sound was low, echoing through the cavern, growing until even the stone seemed to shudder. The Children cowered, and the girl froze in terror.

"Poseidon will save you?" Nerissa's eyes gleamed brighter, like two lanterns in the abyss. She stepped forward, one hand curling beneath the girl's chin. "Child, I am older than your god's dreams. I was here when the sea was young. I drank from the veins of the world before his name was even spoken. If Poseidon comes… he will find his children are already mine."

The girl whimpered, tears falling like salt crystals. Nerissa whispered a spell, and the girl's sobs cut off as her voice turned hollow, green light flickering in her eyes. Another Child bound.

The witch returned to her throne, satisfied.

But even in her triumph, she felt it: the shift of tides far above, the pulse of Poseidon's will moving across oceans, shaking the very bones of her domain.

He was not weak. He was not chained. And every moment his strength grew.

Nerissa's long nails tapped against her throne. She knew what this meant. Sooner or later, their worlds would collide. Poseidon could not allow her kingdom to thrive, and she would not bow to his divinity.

"Let him come," she murmured. "The god thinks himself lord of the oceans, but the abyss… the abyss is mine."

The Children echoed her words, their hollow voices rising in a chant that made the waters quake.

"Mine. Mine. Mine."

Meanwhile, above the cursed trench, sailors from distant lands whispered of the witch. They told stories of children taken by the sea, of voices calling from the deep, of ships swallowed in calm waters with not a ripple of struggle.

Some claimed she was a goddess betrayed by Poseidon long ago. Others swore she was a mortal queen who refused to die, binding herself with abyssal sorcery. None knew the truth.

But all agreed on one thing.

Where Nerissa's shadow fell, the sea did not belong to gods.

In the dead silence of her chamber, Nerissa turned once more to her mirror of bones. The image of Poseidon burned before her—his eyes lit with oceans, his power undeniable.

Her lips curved into something sharp.

"Poseidon, drowned king, you rise. But remember this—" Her voice deepened, carried by the abyss until even the sea-floor trembled.

"Every god who forgets the abyss… drowns in it."