Since it's the first one I found online:
Columi Relic of Imperiling Serenity
Binds on Pickup
Relic, Slot 67
Armor Rating 136
Requires Level 50
Use: Increases Defense Rating by 270 for 30 seconds
It may have Power on it, but it has a clickable effect that gives you +270 Defense rating for 30s.
You don't need that.
What you need is this: