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.
I am the home for feathery animals.
I am black when you buy me, red when you use me. When I turn white, you know it's time to throw me away. What am I?
What has to be broken before you can use it?
Draw fire or fill me; I'm still empty.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?