A 3D realistic rendering of a crystalline skull composed of translucent glass with ethereal blue and violet light radiating from within, casting dynamic reflections and refractions against a midnight black background. The skull is rendered in octane, enhancing its hyper-realistic quality and providing a mesmerizing, otherworldly glow. The interplay of light and shadow creates an enigmatic, sci-fi ambiance, with subtle hints of an ancient alien script etched into the glass surface, amplifying the mysterious allure.