A highly detailed 3D image of a transparent crystal skull, with facets that catch and refract light, creating an ethereal glow as vibrant green and blue luminescence permeates its structure. The skull's interior subtly reveals intricate circuitry patterns illuminated by the fluctuating colors, adding a futuristic twist. Suspended in a void-like black background, the scene evokes a sense of awe and mystery, as though the skull is an ancient alien artifact. The use of Octane rendering elevates the image with hyper-realistic reflections and depth, accentuating its otherworldly sci-fi allure.