A premium cinematic dark fantasy comedy poster, vertical 9:16 composition. An immortal skeleton fitness trainer running a magical underground gym inside an ancient gothic castle. The main character is a charismatic humanoid skeleton with glowing blue magical runes carved across his bones. He wears a stylish dark fantasy athletic outfit combined with lightweight enchanted armor, leather straps, ancient power bracelets, and a professional trainer cloak. He stands confidently in the center of the gym, holding an ancient magical training staff and demonstrating an exercise like a legendary fitness coach. Around him are fantasy clients training after death: a friendly zombie wearing simple athletic clothing, a noble knight practicing with enchanted equipment, and an elegant vampire warrior doing magical strength exercises. They look focused and inspired. The gym is located inside a massive gothic underground fortress: ancient stone walls, enormous pillars, glowing magic crystals instead of lights, mystical training equipment made of metal and wood, ancient artifacts of strength, floating rune symbols, and magical energy flowing through the room. The atmosphere combines dark fantasy, humor, and heroic fantasy. A skeleton who became the ultimate fitness mentor for creatures of the night. Ultra detailed skeleton design, cinematic movie poster quality, AAA fantasy game concept art, realistic textures, dramatic lighting, volumetric atmosphere. Color palette: dark stone, cold blue magical glow, silver metal, deep burgundy accents, warm torchlight. Sharp focus on the main character, detailed foreground, softer atmospheric background depth. No logos, no text, no watermark.
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