Guild Wars 2

Does it work? can’t see any increasing of critical hit chance or any stacks when applying vuln.
If it works, how does it work?

When you hit a foe, it increases you crit chance against them by 2% for each stack of vuln on them. You won’t see any change on your stat bar or any buff by your skill bar because it works separately for each foe.

I feel like something about this trait should be stickied to the top of the forum. We get this question every couple of weeks.

Yes, the trait works perfectly. It doesn’t show up on your UI because it is based on the foe’s conditions, not you.