Fiery Chasm
Under the Ash Mountains#100 (x3/x2)
X (5)
X is 1 more than the number of quest cards in play.

Forced: When Fiery Chasm is explored, discard the top X cards of your deck.

...its floor and walls on either side were cloven by a great fissure, out of which the red glare came, now leaping up, now dying down into darkness...
-The Return of the King