Regal dark fantasy mermaid seated on glowing coral throne

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This atmospheric dark fantasy digital illustration depicts a stern, ancient siren mermaid queen resting on a throne of tangled, glowing deep-sea coral, positioned next to an ornate weathered stone arch ruin on the abyssal ocean floor. Cool shadowy teal and deep navy color tones are punctuated by bright bioluminescent green sparkles and faint shafts of surface sunlight filtering through dark water, creating a haunting, mystical, otherworldly mood. The artwork leans into gothic ocean fantasy, lost underwater civilization lore, and mythical sea creature themes.