a photorealistic 3D render of a full body dark side knight (as an archetypal DnD isekai Demon Lord) wearing power armor made of gold and silver, inspired by Fallout, unreal engine, octane render, cinematic lighting, a sense of evil, detailed hard surface boss character concept art, character design, hyper realism, high detail, depth of field, stunning cgsociety, HD, HDR, 4k