Afraid of the Dark
The Wilds of Rhovanion#48 (x2/x1)
Treachery
When Revealed: Attach to a questing hero and remove it from the quest. (Counts as a Condition attachment with the text: "Limit 1 per hero. While the active location has the Dark trait, reduce attached hero's to 0 and treat its text box as if it were blank, except for Traits.")