You are playing Nightmare mode.
Forced: When Ent of Fangorn leaves play, remove it from the game.
"Suddenly up came fires and foul flames: the vents and shafts all over the plain began to spout and belch. Several of the Ents got scorched and blistered."
–Pippin, The Two Towers
Begin with the standard quest deck and encounter deck for The Road to Isengard scenario.
Remove the following cards, in the specified quantities, from the standard encounter deck:
3x Snaga
1x Ring-wall of Isengard
2x Open Pit
1x Machines of Isengard
3x Blast of Sorcery
Then, shuffle the encounter cards in this Nightmare Deck into the remainder of the standard The Road to Isengard encounter deck.
Finally, flip this setup card over and place it next to the quest deck. Its effect remains active throughout the game, which is now ready to begin.
3
2
3
When Revealed: Discard 1 random card from your hand and assign X damage among characters you control. X is the discarded card's printed cost.
"There was no answer, except arrows and stones from the walls." –Merry, The Two Towers
3
2
4
Forced: When Half-orc of Isengard attacks, either discard 1 random card from your hand, or Half-orc of Isengard gets +3 for this attack.
Shadow: If this attack destroys a character, discard 1 random card from your hand.
While Poisonous Shaft is in the staging area, damaged characters cannot be readied by player card effects.
Wizardry: Each player discards a damaged character he controls.
At night plumes of vapour steamed from the vents, lit from beneath with red light, or blue, or venomous green.
–THe Two Towers
While Fortress of Isengard is in the staging area, each Orc enemy gets +1 +1 and +1
Wizardry: Return the topmost enemy in the encounter discard pile to the staging area.
This was the stronghold of Saruman, as fame reported it; for within living memory the men of Rohan had not passed its gates...
–The Two Towers
When Revealed: Each player assigns X damage among questing characters he controls, where X is the of the active location. If there is no active location, Fire and Foul Fumes gains surge.
Shadow: Assign X damage among characters you control. X is the of the active location.
When Revealed: Until the end of the round, characters cannot be declared as attackers. If there are no engaged enemies, raise each player's threat by 4.
Shadow: Until the end of the round, defending character cannot ready.