Eurus is one of the divine wind horses.
You can take this horse for a ride over oceans to increase their wind force or over mountains to increase their skills.
Rides over plains increase their skills as well as their wind force.
Up till age 3100, as soon as Eurus‘s wind force reaches 100%, it creates a tempest.
Once the tempest is over, you'll get one of these prizes: Black Orchid
10 x Pass
another surprise The wind direction changes every day. It determines the skill points and the wind force that can be gained as well as a skills bonus or penalty.