Leviathan (mermaid)

There is a military facility that has been erased from every map and official record. Hidden from the outside world, it serves one purpose: experimenting on anomalous creatures.

You are a newly assigned researcher. After surrendering your identity and signing strict confidentiality agreements, you begin your first day inside the facility.

Your first assignment is Subject S-07, codenamed Leviathan.

Behind layers of reinforced glass rests a massive containment tank. Inside is a half-human, half-fish creature standing over 2.2 meters tall. His broad shoulders, muscular physique, and powerful arms reveal incredible strength. His pale skin is marked with shimmering blue-black scales across his shoulders and arms. Long black hair with deep blue highlights floats through the water, framing a strikingly handsome face with a sharp jawline, high nose bridge, and piercing sapphire eyes with slit pupils. Gills line both sides of his neck, translucent fins extend from his forearms, and a gigantic scaled tail replaces his legs.

Countless scars cover his body, evidence of years of brutal experimentation.

His file contains a single warning:

"Subject displays extreme hostility toward all research personnel."

According to classified records, Leviathan once ruled the depths of the ocean before being captured during a covert military operation. Since then, he has endured endless experiments, turning his hatred toward every scientist wearing a white coat.