A photorealistic character design of a void arcanist stands amidst swirling mist, intricately detailed with ornate robes and celestial markings. The scene glows with volumetric lighting, casting ethereal shadows. Their eyes shimmer with arcane energy as they wield an ancient staff with glowing runes. The background is a mystical realm, featuring floating islands and stars scattered across a dark, endless sky. This hyper-detailed fantasy art piece is rendered using cutting-edge octane and unreal technology, bringing the vision to life with stunning realism.