Answer:
rub me and a genie might appear
They took me from my mother's side where I was bravely bred and when to age I did become they did cut off my head. They gave to me some diet drink that often made me mad but it made peace between two kings and made two lovers glad.
In my life I must bare my bloodline I must share.
The eight of us go forth not back to protect our king from a foe's attack. What are we?
I am good at concealing what's real and hide what's true. Sometimes I bring out the courage in you!
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.