A 3D realistic image of a crystal-clear glass skull with intricate engravings, illuminated by pulsating azure light flowing through its veins, casting dynamic reflections and refractions. The black backdrop accentuates the ethereal glow, creating a surreal and enigmatic atmosphere. The image is meticulously rendered using the octane engine, delivering breathtaking realism and an immersive sci-fi aesthetic. Subtle holographic patterns dance across the skull's surface, adding an extra layer of mystery.