Exposure.
Anytime on their turn, but before drawing any cards in their Evening, an enemy player with faction pieces in a clearing with a facedown plot token may show the Corvids a matching card to guess the type of plot token in that clearing. If incorrect, the Corvids say "no", and the enemy player gives that card to the Corvids. If correct, the enemy player removes the plot token
(scoring a victory point) and ignores its effect.