The Ruler of Night

My object looks like a horse of the night that has been through an epic journey.
My object feels as warm as a bed at night and as cold as ice in a freezer in the day.
My object sounds like the gallop of a horse.
My object taste like the air at a field of green grass in summer.
My object smells like the pollen of the flowers in a valley.
It is the ruler of the night.