What's the ad for?
Ravenloft is a role playing game that uses the Advanced Dungeons and Dragons rule set. From my limited understanding, the Ravenloft universe is an alternate time-space existence that consists of pocket universes which can appear anywhere in the Dungeons and Dragons universe. I primarily know the name Ravenloft from a popular board game that was released a couple years ago entitled Castle Ravenloft. There have been numerous books and three video games based on the Ravenloft pocket universes, almost all of them released in the nineties. Perhaps the popularity of the board game will cause a renewed interest in the Ravenloft universe.