I have 100% up time with full shield, not taking any “health damage” only minor damage to the shield, and the rune just still not triggering at all somehow.
bump my own, it is bugged, I test on dummies, 100% shield, 100% shield up time, the rune works on boss dummy, not working on normal dummy, and not working on most other scenarios.
I had the same issue over on my necromancer.
The uptime should be 100%, but sometimes, the game just doesn’t give you the buff. The animation for it will go off, but you don’t actually recieve the buff. I even checked my character sheet to see if it was still raising my attack power and the buff not being there was just a visual glitch, but its not.
I don’t know what specifically triggers the buff to not happen, as I spent quite awhile attacking a training dummy to see what did and didn’t cause the issue. As far as I know, it’s random, failing to activate about 30-50% of the time.