- When Curse of the Rougarou is 'put into play' in the lead investigator's threat area, 'put into play' means essentially the same thing as 'add'. After the scenario, the curse is added to that investigator's deck for the remainder of the campaign.
Revelation - Put Curse of the Rougarou into play in your threat area.
Forced - At the end of your turn, if you have not dealt any damage this turn: Take 1 horror.
For most investigators, this weakness is very punishing, especially those with low sanity, like most guardians.
However enter the dreamteam, Carolyn Fern and Peter Sylvestre! She complains how she'd like to eat something human or monstrous... dealing him 1 horror. He disbelieves it, heals his horror and pays her for her great jokes. If this isn't a win-win situation, turning this weakness into a great source of income?
The accompanying Monstrous Transformation isn't as beneficial for her, as it reduces her to 2. But it boosts her to 5, so she can fight for once. However it's not very likely you'll see this card every game with only 1 copy in your deck and your focus on finding the weakness, so i wouldn't rely on it.