High-quality line art and coloring, game concept illustration set in a medieval fantasy backdrop. Beneath a massive castle, a dim underground hall with grey brick walls and floors. A beam of white light from above highlights the silhouette of a large, robed man standing in the center of the illustration, heavily emphasized in darker tones. Overall grayscale, viewed horizontally from a distance on the side, with paths extending left and right and primarily focusing on wall surfaces rather than the ceiling. The floor is subtly visible at the bottom of the image, with sporadic, large round columns scattered along the path. --niji 6 --style raw --s 250