Answer:
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. I have greatest power when given away, yet lust for me keeps me locked away.
What has one eye but cannot see?
I weaken all men for hours each day. I show you strange visions while you are away. I take you by night, by day take you back. None suffer to have me, but do from my lack.
What has two spines and a lot of ribs, and carries much but never moves?
Steals an event or even a mood. Reveals the truth or shatters it.
You use it between your head and your toes, the more it works the thinner it grows.