Answer:
The 8 of us go forth and not back to protect our king from a foe's attack. What am I?
I can be swallowed But I can also swallow you.
I can speak with my hard metal tongue. But I cannot breathe for I have no lung
Iβm hard as a rock and as light as a feather. Iβm passed on to one another. Poor people need me and rich people have me.
I am the minerals vital for your good health.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?