A horse bred and raised by the Hattori brothers' father at the behest of The League. Why they needed the horse, or what abilities Mr. Hattori had that were so valuable that The League hired him are unknown.
After Mr. Hattori's death, the Hattori brothers hired someone to take care of and prepare the horse for racing. They entered it in a race, and it lost. They then gave it to The League at Abathur's request.
The horse's fate after this is unknown.