Spoilers below
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We've had one session and already the PC's are taking Irena to Vallaki, considering the length of the journey, the spy's and scrying spells, It'd be damn near impossible for Strahd not to find out about this.
How would Strahd react to this? I don't want him to eviscerate 4 lvl 3 adventures, but I also think he would confront them about this or at least do something to get Irena, possibly with Irena in the party.
How do I make Strhad seem all-knowing an all-present, powerful and terrifying without immediately kidnapping Irena or causing a TPK?