shield V2 (link)
This page could/should be used to talk over what the guardian could stand to gain from the idea in the main link aswell as possible traits and uses for the idea.
lets not let the cool idea die just yet
One possible idea is a trait that will absorb projectiles and store them for use with Shield of Judgment making that skill feel a little more judging of enemies rather then just damage.
p.s i got that idea from the spirit temple boss fight with the mirror shield from ocarina of time