In pvp, I have been dying to GFs in a second. They are deflecting an endless loop of damage back to me from my own weapon buffs.
For example:
Your Aura of Courage does 816 damage to you.
Your Sacred Weapon does 186 damage to you.
Your Feytouched weapon does 0 damage to you.
This repeats in my logs until I died.
More about this bug in this thread here:
http://www.arcgames.com/en/forums/neverwinter/#/discussion/1226224/match-you-died