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.
Eurus cannot be sold.
See a list of everyone who owns Eurus