Darkened Stairway
The Mines of Moria #16 (x2)
Location
2
3 (4)

While Darkened Stairway is in the staging area, it gains:"Forced: After a 'when revealed' effect is canceled, reveal the top card of the encounter deck."

Travel: Discard the top card of the encounter deck. If that card is a treachery, resolve its 'when revealed' effect.