20 Strong: Tanglewoods Baba YagaExpansion

From BoardGameGeek:

The big bad was in front of you the entire time, hiding in plain sight! Baba Yaga, the evil horror of Slavic folklore, weaves new challenges that will persist throughout all three Tanglewoods decks, resulting in a fierce final battle when at long last the exit to the Tanglewoods is found. Posing as lowly merchant, she may have seemed helpful, but the creatures she sends after you will pose difficult choices for you along the way. Each choice will ultimately make a consequential impact on your final battle. The Baba Yaga campaign add-on allows you to play your three Tanglewoods decks in any order you choose! Experiment with different heroes, orders, and strategies to emerge from the Tanglewoods victorious! -description from the publisher