A mechanical prosthetic arm for a Dungeons & Dragons monk character, made of polished steel and bronze with intricate clockwork mechanisms. The design features a prominent lever on the shoulder, connected to a glowing slot machine mechanism embedded on the bicep with three magical reels displaying runic symbols. The arm is sleek yet powerful, with an articulated, slightly claw-like hand optimized for combat. The monk wearing it is muscular and surrounded by an ethereal aura of magical energy. The background is a mystical dojo with glowing runes, warm ambient lighting, and a magical, otherworldly atmosphere