Final answer:
Barovians commonly believe that the cause of Strahd's curse stems from his unrequited love for Tatyana, which led to tragic events and his eternal dam-nation.
Step-by-step explanation:
The Barovians are the fictional inhabitants of Barovia, a realm in the Dungeons & Dragons adventure module “Ravenloft.” When it comes to the cause of Strahd's curse, it is most commonly believed by the Barovians to be the result of his unrequited love for Tatyana. The lore depicts Strahd as a tragic figure who, due to his intense love and subsequent actions that unfolded as a result, sealed his own dark fate.
The information provided does not directly pertain to the Curse of Strahd and seems to be from a different source. However, it does touch on themes of hereditary evil and the ideas of predestination or inherent character flaws, which, thematically, could be likened to the concepts within the Curse of Strahd narrative.