Answer:
The eight of us move forth and back. To protect our king from the foes attack.
Has no feet, but travels far. Is literate, but not a scholar. Has no mouth, yet clearly speaks.
What get wet while drying
This thing runs but cannot walk, sometimes sings but never talks. Lacks arms, has hands; lacks a head but has a face.
It holds no blessings in disguise. Its rhymes are aimed at your demise, it's cast only to ruin, Whatever you are doin'.
I am your mother's brother's only brother in law. Who am I?