Answer:
Although I'm not an insect, some people found me very difficult to exterminate. They called me something like 'insane priest.' The first half of my name means the same as 'scrape,' & my last three letters are a metal. Who am I?
A box without hinges, lock or key, yet golden treasure lies within.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
It is a sound of empty, speak and it'll talk back plenty. But all the more you yack, you'll get the same words back.
What is the heart of many risks, has a heart, but is not a living being?
Do what he says and you'll be fine, don't and you lose the game.