Answer:
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
A slow, solemn square-dance of warriors feinting. One by one they fall, warriors fainting, thirty-two on sixty-four.
Look into my face and I'm everybody. Scratch my back and I'm nobody.
Used on a diamond and left on a board. It's great for a gymnast his grip to restore. What is it?
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard.
What sphinxes employ and players enjoy.