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.

In summer green, in winter bare, I line the path with quiet care. No bricks, no wood, yet I divide, What green wall stands side by side?