Barovia is a realm in the Shadowfell ruled by Count Strahd von Zarovich. Everyone in Barovia is trapped, unable to leave due to the mists that surround the realm. When the denizens die, their spirits wander the mists and are eventually reborn with no memory of their former lives.
The heroes were first drawn in by the mists while they were camping. They escaped Barovia after they trapped Strahd in the doll. As they left, they saw rays of sunlight touching Castle Ravenloft for the first time in years.
Evelyn and Paultin were suddenly drawn back into Barovia while they were eating waffles in Citadel Adbar. The dark powers wanted Paultin to be the new dark lord of Barovia, but Paultin resisted by destroying his shadow with the sunsword. The dark powers, furious, sent the waffle crew into Barovia's past.
The group appeared in Barovia on the day of the wedding between Sergei and Tatyana. They convinced Tatyana that she was in danger and they found a fresh, young version of Simon, meant to be a wedding gift. The adventurers broke up the wedding party and tried to help Sergei and Tatyana escape. Strahd chased them.