A black and white photo of a demon with horns on it

A majestic, imposing beast with black,shiny skin, curved horns, deep-set eyes radiating mysterious light, muscular and powerful body, ancient runes inscribed emitting ethereal glow, detailed shiny black skin texture of dense shadows, curved well-defined horns with solid, shiny substance, intense eyes with subtle shine, environment highlighting duality of mystery and power, carefully chosen lighting to highlight characteristics of each shape without losing details like ancient runes in bestial form