Answer:
The eight of us go forth not back to protect our king from a foe's attack. What are we?
If you have me you want to share me. If you share me you don't have me. What am I?
The more you add the less it weighs. What is it?
In your fire you hear me scream creaking and whining yet I am dead before you lay me in your hearth.
I cannot be bought, cannot be sold, even if I'm sometimes made of gold. What am I?
I always have to work with something in my eye. What am I?