Just to get a feel for how the audience is split, which of these options would be your preferred format for a horror Adventure Path...
#1: Horror in a regular campaign setting
There are places in the Realms (or Greyhawk, or Eberron, or wherever) where the forces of darkness are just a little stronger. Where things are going wrong. There you have to deal with some unsettling problems.
#2: A visit to Ravenloft
Ravenloft, the Demiplane of Dread, holds many forms of Gothic Horror, and occasionally it ensnares people from your regular world. The adventure finds your PCs drawn through the mists, where they must survive, deal with the problem, and escape!
#3: A full Ravenloft campaign adventure
Your characters are natives of the setting. There's no escape, but perhaps your actions can make the darkness a little less bleak. For a while, at least!
#4: Please, not a horror adventure!
You dislike horror adventures and would not use or play one.
#1: Horror in a regular campaign setting
There are places in the Realms (or Greyhawk, or Eberron, or wherever) where the forces of darkness are just a little stronger. Where things are going wrong. There you have to deal with some unsettling problems.
#2: A visit to Ravenloft
Ravenloft, the Demiplane of Dread, holds many forms of Gothic Horror, and occasionally it ensnares people from your regular world. The adventure finds your PCs drawn through the mists, where they must survive, deal with the problem, and escape!
#3: A full Ravenloft campaign adventure
Your characters are natives of the setting. There's no escape, but perhaps your actions can make the darkness a little less bleak. For a while, at least!
#4: Please, not a horror adventure!
You dislike horror adventures and would not use or play one.