Hey guys, I'm Orche Stra, I posted the screenshot a couple weeks back.
To clear things up, it's 4% damage mitigation, I love them because I'm a main puller for my guild (Bard) and it's nice to have some mitigation on those 3-4k hitters so you survive getting back to camp.
I was told these are very common, but after about 10-15 Time Clears we've only seen 2-3 of them? maybe 4.