I am looking for ways to cause my opponents to be vulnerable to the damage I deal in combat.
I am not interested in ignoring resistance, I am only looking to cause the vulnerability condition.
Ideally I would like it to apply to any damage type I am dealing in the moment, however at this point any type of vulnerability will do, as I have not found any on my own.
What are some of the spells, and class/racial abilities or magic items that create this condition in others? Oficial WotC content only please. (no Unearthed Arcana)