Duergar, Oil painting simulation, dark fantasy. A male duergar kavalrachni, the dreaded cavalry of Gracklstugh, riding a giant tarantula (female steeder) through a vast Underdark cavern. Pale ashen gray skin, completely bald, long gray beard, dull black emotionless eyes. Wearing scale mail armor and shield, practical and unadorned duergar craftsmanship. Wielding a war pick in one hand, heavy crossbow strapped to the saddle. Mounted atop a massive hairy tarantula with eight glowing eyes, chitinous legs spanning wide, moving across uneven cavern floor. Behind them, massive stalactites hanging from high ceiling, bioluminescent fungi casting dim blue-purple glow, distant faerzress mist. Dramatic low-angle lighting from fungal glow below, casting long shadows upward. Grim militaristic posture, the kavalrachni scanning for threats. Visible oil brushstrokes, desaturated grays, deep purples, muted greens, painterly finish, no text