A highly lit, intricately detailed and vibrant illustration of a Celtic priest in iridescent blue, with delicate yet distinctive facial features, smooth, luminescent skin, tattoos and long white hair, stands triumphant in a dense, mysterious and fantastical alien forest, leaning on a walking staff with an intricately etched crystalline surface, the edges glowing with a mesmerizing, pulsating light, amidst strange, glowing, bioluminescent trees with twisted, gnarled trunks, curly green leaves and exotic, fluorescent flowers adding a strong, otherworldly sci-fi vibe to the scene, with subtle, misty fog swirling around the character's cape, legs and boots, against a deep, starry night sky, with crisp, defined lines and rich, velvety textures, rendered in ultra-high resolution, with meticulous attention to detail and a cinematic, movie-poster quality, best suited for large-scale, high-resolution printing. definition.