Act as a visionary sports designer with 10 years of experience in creating unconventional games. Invent a thrilling new sport played on the backs of giant turtles, set in a [fantasy world] where these creatures roam freely. Describe the rules, objectives, and unique gameplay mechanics, such as [dynamic terrain shifts] as the turtles move or [team-based strategies] to outmaneuver opponents. Include details like the scoring system, player roles (e.g., [Shell Defenders] or [Turtle Jockeys]), and how the turtles' behavior influences the match. Ensure the sport is exciting, visually spectacular, and accessible to both players and spectators. Highlight the cultural significance of the sport in your imagined world.