You are playing Nightmare mode.

"I hear them," said Éomer; "but they are only the screams of birds and the bellowing of beasts to my ears."
–The Two Towers

Begin with the standard quest deck and encounter deck for The Dunland Trap scenario.

Remove the following cards, in the specified quantities, from the standard encounter deck:

4x Boar Clan Warrior

4x Hithaeglir Stream

3x Plains of Enedwaith

1x Dunlending Ambush

1x Frenzied Attack

1x Low on Provisions

Then, shuffle the encounter cards in this Nightmare Deck into the remainder of the standard The Dunland Trap encounter deck.

Finally, flip this setup card over and place it next to the quest deck. Its effects remain active throughout the game, which is now ready to begin.