Duergar, Masterpiece quality oil painting simulation, dark fantasy, ultra-detailed, 8K resolution, painterly finish, visible oil brushstrokes, desaturated grays, deep blacks, muted orange highlights, dramatic low forge lighting. Squad of duergar Stone Guard (royal guard and secret police of Deepking of Gracklstugh) standing protectively at castle entrance of duergar city in Underdark, MULTIPLE FIGURES FULLY VISIBLE HEAD TO FEET, NO CROPPING, tight formation facing viewer, grim militaristic posture with unwavering stoic discipline. Duergar warriors: pale ashen gray skin, completely bald, long gray beards, dull black emotionless eyes with harsh intimidating expressions, heavy dark metal plate armor (angular brutalist design, no ornamentation), wielding steel shields with war picks or heavy crossbows. Background: massive stone fortress gates carved from living rock, dark gray stone architecture devoid of art or decoration, dim orange glow from coal forges filtering through high windows, smoke drifting upward. Some guards partially phasing with innate invisibility power, translucent outlines visible. Dramatic low lighting from forge fires casting long shadows upward. Highly detailed armor textures, shield details, weapons, forge glow, smoke effects, stone gates, phasing outlines. Professional quality, Underdark royal guard, cinematic composition, Artstation masterpiece.