Ruin Explorer
Legend
I'm not sure 5E has any classes that specialized. In general 5E base classes which have specialized elements make them "nice-to-have" rather than core features. Ranger without Tashas is about the most specialized I can think of.Cool. I was replying to someone complaining that Druids aren't useful in dungeons, and trying to point out that taking a specialty class and then complaining about its weakness is a bit much.
Some archetypes kind of are, and it's notable that non-casters are much more likely to suffer here. I can't think of a caster archetype, off-hand, which sacrifices a ton for some specialized abilities which might not see use because of the adventure location or the like (maybe some other kind of Druid?), but I can think of, for example, the Assassin Rogue, who is not great at the best of times, and who has subclass abilities focused around infiltration/disguise which could easily not get used, and even if they do get used are not likely to be particularly great.