Zephyrus is one of the Wind divine horses. You may ride him over oceans to increase his wind strength or over mountains to increase his skills. Rides over plains increase his skills and his wind strength. Up until 3100 years old, as soon as the wind strength of Zephyrus reaches 100 %, it'll be able to generate a storm. Once the storm is over, you'll either win:
The wind direction determines skills or wind strength points that Zephyrus is winning during rides, and the gift won during a storm. When the wind is from a certain direction, Zephyrus might also receive a skills bonus or penalty for the current day.