Answer:
I am shared by goats devils and unicorns.
I am an instrument that you can hear but cannot see or touch. What am I?
In a tunnel of darkness lies a beast of iron. I can only attack when pulled back. What am I?
I am perfect with a head perfect without a head; Perfect with a tail perfect without a tail; Perfect with either neither or both.
I pass before the sun, yet make no shadow. I'm all around you, but you cannot see me. What am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?