Answer:
What binds two people yet touches only one?
What has to be broken before it can be used?
I pass before the sun, but make no shadow.
Thousands lay up gold within this house. But no man made it. Spears past counting guard this house, but no man wards it.
If I have it, I don't share it. If I share it, I don't have it. What is it?
I break away from my pack. I create holes in my victims. I can travel for miles and then disappear. I am part of a dying breed. What am I?