I got it activated a bunch of times on my linker using the secondary weapon to do physical damage on mobs (“C” key for keyboard users). Quite efficient DPS method with no Dex nor Int with a 5x Red Gemmed Five Hammer.
The buff gets displayed on the 2nd line of buff, it doesn’t override primary buffs like blessing or sacrament. I still haven’t figured out what it represents though ^^
I never managed to stack it more than 4 times though.
The buff duration is way to short.