a photorealistic 3D render of a full body dark side knight (as an archetypal DnD isekai Demon Lord) wearing armor made of gold and silver, inspired by Dark Souls and Doom Eternal and 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