I came across this the other day haven't tested it. Wasn't sure if this was still do able or changes had been made ect, Any one ?
As far Ive tried this in bwe3 it doesnt gif perma anymore but using multiple stealth skils like shadowrefuge gets you close to some kind of perma stealth as far i know, if you want perma stealth with a group there are some class combos or other skills you can trigger for stealth too.
This was nerfed a while back. Only applies a 2s stealth per blast so a max of about 8s... maybe more if you get tonnes of Thiefs, but it's no longer so obnoxiously powerful.