The Crack of Doom
The Mountain of Fire#78 (x1)
4A-B (-)

When Revealed: Shuffle the encounter discard pile into the encounter deck and discard cards from the top until X enemies are discarded, where X is the number of players. Add each enemy discarded this way to the staging area.

He was come to the heart of the realm of Sauron and the forges of his ancient might, greatest in Middle-earth; all other powers were here subdued.
-The Return of the King
Dire. Allies cannot enter play and 'when revealed' effects cannot be canceled.

Forced: When Mount Doom is explored, the first player makes a Fortitude test. Discard 1 extra encounter card for each player. If the first player fails this test, the Ring-bearer claims The One Ring and the players lose the game. If the test is successful, the Ring-bearer completes the quest and the players win the game.