These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
In Dark Legacy, the Dream World's aptly-titled Nightmare level is pretty much the literal take on this.
The Wraith is this too.
Special mention goes to the Lich, who is the Guardian of the Forsaken Province and, if we're going in order of availability, the first boss. When he emerges from his grave, an ominous creaking noise is heard. During the fight, he occasionally taunts the heroes by whispering "Come here..." in a sinister tone. The guy has exposed flesh and bone, and can spit out bloody chunks that spawn maggots. While the fight is easy (Especially if you have the Book of Protection, and that's not even counting the levels you would have gained by the time you acquire it), this colossus is perhaps the most memorable boss in the game for this trope.
Emerge nothing, the Lich breaks out of his tomb, unimpales his head from the shaft of the axe that was likely used to behead him, places it on his neck with icky bone cracking noises, then grabs his axe and laughs. Freaky as hell.