The Sorcerer's Tower
Attack on Dol Guldur#21 (x2)
Location
2 (4)
While The Sorcerer's Tower is in the staging area, it gains: "The players cannot travel or place progress here unless they are at stage 3D. Forced: After a 'when revealed' effect is canceled, reveal the top card of the encounter deck."

"I don't advise you to go anywhere near the places overlooked by his dark tower!"
-Gandalf, The Hobbit

SIEGE 2