"3D model of a mysterious treasure chest with a large recessed question mark symbol engraved into the center of the lid. The chest is made of dark aged wood with black iron reinforcements and detailed carvings along the borders. Subtle glowing blue runes are etched around the question mark. The surface shows wear, scratches, and weathering. High-poly, PBR textures (wood, metal, emissive glow), clean UV mapping, game-ready asset optimized for Unreal Engine 5 and Blender."