Dark fantasy scene featuring shadow knights in a mystical cave illuminated by surreal caustics. The atmosphere is ethereal, with magic weaving through the air in a perfectly captured masterpiece. The knights possess perfect anatomy, highlighted in a photorealistic portrait style, and captured in 32k UHD resolution. The scene is in sharp focus, resembling professional photography with a cinematic angle that showcases the reflection of lights on their armor, enhancing the surreal optics. The background is meticulously detailed, portraying the mysterious depth of the cave environment. The image quality is exceptional, designed to evoke a sense of wonder and mystery typical of dark fantasy settings.