A 3D realistic image of a glass skull with indigo light pulsating through it, casting a soft glow and showcasing its transparent nature. The black background enhances its illuminated presence, and the rendering with Octane Engine accentuates intricate reflections and refractions, imbuing the image with an enigmatic and futuristic aura. Wisps of ethereal mist swirl around the skull, adding an extra layer of mystery and depth to the scene.