I’m a simple thing, yet strength I lend, With little effort, great force I send. Push me down or pull me near, I make heavy work seem less severe.

Built of gold along the shore, I rule a kingdom until four. With towers tall and moats so wide, I fall before the rising tide.

I am the armour for a fragile crown, A rigid roof when rocks rain down. I case the bone where thoughts reside, To turn a lethal blow aside. What am I ?

I have a single eye, but I cannot see. I am often used to bring things together, but in video games, I am a weapon that lets you strike from the shadows for a silent, lethal elimination. What am I?

The market trusts my balance. The courtroom trusts it too. Each morning someone else looks down to ask if theirs is true.