Demiplane of Dread

The Demiplane of Dread--also notably called The Domains of Dread or Ravenloft--sits at one of the car corners of the Shadowfell, and is typically hidden from the rest of the plane by thick walls of dense mist; also used to prevent unwitting travelers from ever leaving via conventional methods. This demiplane is home to many creatures and even several settlements, mostly notably Barovia--the domain of infamous vampire Count Strahd von Zarovich--though many similar domains could be also found throughout.
In 1206 ATC, adventurers hunting a vampire feeding on the residents of Blackbridge in the Kingdom of Flamelle would stumble into Solisombria, the Domain of Lord Artorias and Lady Tabatha Ravencroft.