Answer:
You need a key to receive an answer from me. The answer you'll find is straight from your mind. What is it?
A precious stone, as clear as diamond. Seek it out while the sun's near the horizon. Though you can walk on water with its power, try to keep it, and it'll vanish in an hour.
Held firmly in the hands, like a sword it cuts deep. Bloodless strokes, all, then forward we leap.
You saw me where I never was and where I could not be. And yet within that very place, my face you often see.
Thirty white horses on a red hill, first they champ, then they stamp, then they stand still.
What covers its face with its hands, speaks no language, yet most known what it's saying?