Answer:
I'm a ruler with 12 agents. Half of them work in the darkness. Who am I?
I have branches but no fruit trunk or leaves. What am I?
I have thirteen hearts but no body or soul. What am I?
In a tunnel of darkness lies a beast of iron. I can only attack when pulled back. What am I?
I jump when I walk and sit when I stand.
What did the piece of wood say when he saw the screwdriver and screws approaching?