All classes should have some unique trait (poll)
Rangers already have traps no other class can access, and these pve perks are such a set back and impose such a disadvantage to take Instead of something else. Herbal sensing on druid, or traps and locks on rogue. All perks that provide a little utility and barely any/no advantage in pvp or pve, but would be more detrimental to take instead of a perk that actually helps you kill faster.
I don't know what to do for every class, but a couple already have similar feature like ranger with traps mentioned above, warlock in a way not having spell limits. Undead slaying could be for cleric, or if that's too impactful, maybe the drinking perk.
I've got a poll I created here if you agree.
These perks/innate class feature don't need to be more than slightly impactful in pvp VERY VERY minimal at most rangers traps are probably already enough but maybe chase could be considered if that's not enough.
https://darkanddarker.featureupvote.com/suggestions/580107/all-classes-should-have-a-feature-that-is-unique-to-them Here's my poll
Edit: spelling/ formatting the idea