The Path of Exile team has shared changes to the Purposeful Harbinger Notable Passive due out in a patch later this week.
If you’re unaware, the passive grants 10% increased Effect of Aura Buffs on You for each Herald affecting you. The team cites their reasons to change this due to many things treated as auras, which many players don’t think of as auras,
“The skill was never intended to interact with these and should have said something like "x% increased Effect of Aura Buffs from Skills on you per Herald affecting you". This is something we can control that doesn't arbitrarily break internal systems that aren't meant to have their values modified.”
Now, the passive will only apply to auras from skills. Once this happens, the passive still remain powerful if you’re the type of player who uses auras from skills. However, it will be weaker for those players who are currently abusing it.
The team describes this as a gigantic mid-season nerf,
“This is essentially a gigantic mid-league nerf to the most powerful "build" in the game, which is something we normally try very hard to avoid. We completely understand that players invest time and considerable resources into building their characters, and our policy is to avoid nerfing skills mid-league in almost all cases. Situations like this though, which break the game wide open, are the exception to this policy.”
The team promises investigation into other areas of Delirium which may exhibit similar issues. You can take a look at the full post here.