Prompt: At the center of the painting stands a martial arts hero clad in a deep blue warrior robe. He wields a black long sword, its blade shimmering with a chilling light. His gaze is steadfast and profound, as if able to penetrate all falsehood and evil in the world. His face bears an expression of resolute determination, as if no hardship could shake his resolve. His body is strong and muscular, with well-defined lines and an upright posture like a pine tree. His movements are fluid and vigorous, each sword swing resembling a bolt of lightning slicing through the air, full of strength and aesthetic appeal. The background depicts a desolate valley, with howling winds and flying sand and stones. The hero's figure sways in the wind, but his gaze remains as firm as a rock, unwavering. The overall color scheme of the painting is dominated by deep blue, creating an atmosphere of mystery and ruthlessness. The sword's glow and the hero's figure complement each other in the darkness, forming a picture full of strength and beauty.