Answer:
What liquid can contain the soul?
Each morning I appear to lie at your feet, all day I follow no matter how fast you run. Yet I nearly perish in the midday sun.
Thirty white horses on a red hill, First they champ, Then they stamp, Then they stand still.
Thousands lay up gold within this house, But no man made it. Spears past counting guard this house, But no man wards it.
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?