Monsters in Ravenloft will be more frequent in their uses of special abilities and chaining attacks together; in addition, several of them will set up ambushes for players to snare the overconfident. Even worse, players will deal with a real change in enemy composition when the game changes to night time, with more lethal monsters stalking the darkened forest as the moon creeps out. So you might not experience true terror, but you will be a bit more scared than you were before.
Neverwinter. The whole point of the game is that every kill makes you stronger, after all; that makes it difficult to feel intimidated just because the monsters in a given area happen to be all skeletons or whatever. Which is why the latest development diary reveals that there are other reasons to be scared in Ravenloft. Sure, everything looks spookier, but these enemies are also smarter and faster than the usual.
Source: Official Site