I have a relic with 24% chance to add a general Vulnerability when the target gets a debuff effect. I think the debuff is working after some testing and it seems to be from each instance of applying it regardless of if they have the debuff already.  It still doesn't show up as a debuff and I'm worried that any effect based on debuffs might not be getting the benefit from this added debuff especially those that stack from each vulnerability stack.  Debuff debuff debuff.