Answer:
What is at the end of a rainbow?
People in love are often bound to this.
You use it between your head and your toes, the more it works the thinner it grows. What is it?
Used to keep prisoners silent and to make temporary repairs on cars.
Mountains will crumble and temples will fall, and no man can survive its endless call. What is it?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.