Crystal helmet with the power to focus or diffuse magic
You see an open faced helmet with a circular top.
This headgear holds the fairly unique ability to bend magic. When a spell is cast on the outside of the cap, it will concentrate the spell inside/under it. And when a spell is cast on the inside it will spread the spell everywhere outside the cap.
The cap is magical in nature and fairly sturdy but it is advised to not try to test the limits of it’s durability, also kinda heavy.
(Image from http://misc.thefullwiki.org/Bronze_Equipment )