A mysterious void arcanist shrouded in swirling mist stands against a cosmic backdrop, captured in a photorealistic style using Octane Render and Unreal Engine. The hyper-detailed figure emanates an aura of ancient power, with intricate patterns etched into their robes. Volumetric lighting bathes the scene in ethereal glows, highlighting the arcanist's features and casting mesmerizing shadows. The scene is framed in a 9:16 aspect ratio, accentuating the arcanist's commanding presence within this mystical realm, with rich HDR effects enhancing the depth and realism of the void.