The Legendary Grullo Dun Mustang is a majestic horse with a hyper-realistic design, featuring a muscular yet streamlined body that showcases its agility and strength. Its coat is a striking dun color with primitive markings, including a dorsal stripe and zebra-like leg striping, rendered with high-detail textures to mimic real horse fur. The mane and tail are slightly tousled, giving a wild, untamed appearance, while the eyes are vividly detailed to reflect intelligence and spirit. The horse's proportions are accurate to real-life mustangs, with a compact, powerful build and expressive facial features.