Create a complete 10-second vertical cinematic dark-fantasy video featuring Thalassia Vael’Morath, the same adult abyssal siren shown in all reference images. Strictly preserve her exact face, aristocratic features, silver-white almond eyes, cool pearlescent skin, full wine-rose lips, long wet wavy jet-black hair, pointed aquatic ears, pearl earrings, silver scales across her shoulders and collarbones, midnight-blue sea-silk outfit and enormous obsidian-black mermaid tail. Her tail must retain the same blue, violet and silver iridescent scales, long powerful shape and huge layered translucent fins throughout the entire video.

The setting is a wild black-rock coastline at midnight beneath an enormous full moon. Silver moonlight reflects across the dark ocean. Waves crash against the rocks, cold mist drifts above the water and faint blue bioluminescent particles glow beneath the surface. Maintain the same location, lighting, character design, costume and tail anatomy throughout every shot.

0–2.5 seconds: Begin below the ocean surface. The camera moves backward through dark blue water as Thalassia swims rapidly toward it. Her long hair, translucent sleeves, pearl chains and enormous tail move naturally with the current. Her silver eyes open and glow softly. She rises toward the moonlight and bursts through the surface beside the black rocks in an explosion of silver water. The camera rises with her as water streams from her hair, scales and clothing. Her complete tail follows in a graceful vertical curve, creating a powerful splash behind her. She turns her face toward the camera with calm, ancient authority.

2.5–5 seconds: Thalassia twists her torso gracefully and sweeps her enormous tail across the foreground in one strong fluid movement. The camera performs a smooth circular orbit around her, following the tail and revealing its complete length. Every scale catches blue, violet and silver moonlight. Her massive translucent fin opens fully as it passes close to the camera, without covering her face. The movement creates a glowing crescent of suspended water, floating black pearls and tiny bioluminescent fish. Her wet black hair streams in the opposite direction, emphasizing the motion. The surrounding waves briefly freeze in the air under her hydrokinesis before falling naturally back into the ocean.

5–7.5 seconds: Thalassia rises elegantly onto a wet black rock as the camera lowers into a dramatic hero angle. She supports herself with one hand while her enormous tail coils once around the rock and then extends toward the camera. The full tail and giant fin remain clearly visible. The fin slowly opens behind her like dark iridescent wings while the enormous moon frames her silhouette. Her pearl jewelry sways gently, droplets sparkle across her scales and her silver eyes glow brighter. A circular ribbon of water begins orbiting her body, carrying luminous pearls, blue sparks and miniature translucent jellyfish. She lifts one hand and forms a floating black memory pearl above her palm. Inside the pearl, faint broken images of an ancient underwater palace flicker for a moment.

7.5–10 seconds: Thalassia closes her fingers around the black pearl and looks directly into the camera. Her expression changes into a subtle, mysterious half-smile. The water ribbon collapses into sparkling droplets as she turns and dives headfirst toward the ocean. The camera follows briefly before slowing to reveal her enormous tail lifting completely above the surface in a powerful inverted curve. Her full iridescent fin spreads open against the moon, filling most of the frame. The tail then disappears beneath the water with a dramatic splash. The impact creates a luminous spiral of silver foam shaped like an ancient abyssal rune. The ocean gradually becomes calm again. End on the reflection of the full moon across the water as a single black pearl floats to the surface and releases one soft pulse of blue light.

Premium semirealistic manhwa visual style, mature dark oceanic fantasy, cinematic realism, graceful but powerful feminine movement, realistic wet hair physics, physically accurate water and wave simulation, detailed scale reflections, smooth natural tail motion, atmospheric ocean mist, volumetric moonlight, subtle bioluminescence, floating droplets, elegant magical particles, dramatic depth, high detail, seamless transitions, smooth stabilized camera movement, consistent facial identity, consistent costume, consistent colors and consistent tail anatomy. Vertical 9:16 composition, cinematic pacing, no abrupt cuts.

Sound design: deep ocean ambience, distant waves crashing against stone, soft underwater resonance, pearl chimes, a low ethereal siren hum without words, rising orchestral strings during the tail reveal, a powerful water impact during the final dive and a single delicate chime when the black pearl appears. No spoken dialogue.

Do not change her face, age, body proportions, hairstyle, eye color, skin tone, costume, jewelry or tail design. No human legs, no transformation into a human, no duplicated tail, no short tail, no extra fins, no extra limbs, no extra fingers, no broken hands, no disconnected anatomy, no stiff tail, no unnatural swimming, no costume changes, no random accessories, no different locations, no daylight, no warm sunlight, no exaggerated expressions, no cartoon comedy, no jerky movement, no rapid cuts, no camera shaking, no flickering, no character morphing, no blurry face, no low-detail scales, no frozen fabric, no static hair, no nudity, no text, no captions, no subtitles, no logos and no watermark.