Out of these, I have used beholders, black puddings, and mariliths. And I will be introducing carrion crawlers and mind flayers in the campaign I started last night. Possibly displacer beasts at some point, too. (Probably not intellect devourers, though. Some of my players know enough about monster stats to be familiar with how vicious the intellect devourer is, and "Oh, good, it's just a mind flayer and not an intellect devourer" is not a reaction I want to get.) I have not used a tarrasque, but I have fought them in multiple incarnations, both 3E and 5E.My wife and I watched the D&D movie yesterday. Don't worry - I'm not including any spoilers here. But she and I had a discussion of some of the "iconic" monsters she hasn't encountered since starting the hobby 7 years ago, and maybe why that is.
My thought is that many of the classic creatures from her list harken back to an old style of play that has disappeared amongst 5e players (which is when she started the hobby).
Here's a selection from the list we made this morning (and the reason why I think she hasn't encountered them) ...
D&D isn't in Dungeons anymore...
Black Pudding
Gelatinous Cube
Carrion Crawler
Mind Flayer
Intellect Devourer
Roper
Umber Hulk
D&D doesn't like to trick players anymore...
Mimic
Roper
Gelatinous Cube
Rust Monster
Mid-Range CR creatures have limited windows of use...
(You can't use them like goblins in large numbers, and a single one isn't a challenge. They don't really have a place in encounter design.)
Displacer Beast
Intellect Devourer
Carrion Crawler
By the time you get to that level, the campaign will end or else the monster won't be a challenge...
Beholder
Marilith
Tarrasque
The gelatinous cube, roper, mimic, and umber hulk I am unlikely to use, but only because I don't like them on aesthetic grounds. Functionally, I have no problem with any of them.
D&D just has a crapton of monsters, that's all, and each DM (and adventure writer) is going to have things they like and things they don't. And of the things they like, they won't all fit the theme of any given campaign.
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