Just played The Old Forest as the second scenario of my saga and won it, but I have a problem with the condition for gaining the boon. I'll put it in spoiler tags because I think you're not supposed to see the resolution text before winning a scenario.
Spoiler (click to reveal)
The condition for earning the boon is 12+ damage on Old Man Willow. But how can any damage be dealt to it? Stage 3B prohibits it from leaving the staging area, so players can't engage it and attack, and it's immune to player card effects, which shuts down direct damage effects as well. What am I missing?