For me the first one that springs to mind is werewolf. They just don’t instill he kind of fear or revulsion I would like.
No monsters in 5e are terrifying.
To a greater or lesser extent, they are bags of hit points. Occasionally, they have an extra "trick" to be solved.
Nah, it's just that we on the board here are jaded.No monsters in 5e are terrifying.
No, monsters in 5e are terrifying.No monsters, in 5e, are terrifying.
Trust me--I've been running for a lot of new players lately. People who haven't memorized the MM and/or learned all the tropes and/or developed all the tricks of their characters have a healthy respect for even basic monsters. We on the board here have to remember that we're a jaded subset of the whole group of D&D players.But while I can make things scary or terrifying with narration, atmosphere, and so on, the actual monsters themselves are underwhelming in 5e.
Too often, the setup in narrative terms in undermined by the monster itself.
You end up with a big build up, followed by a "Oh, more of the same. Yawn."

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.