You are playing Nightmare mode.

"The day has come at last." her said: "the day of choice which we have long delayed. What shall now become of our Company that has travelled so far in fellowship?"
–Aragorn, The Fellowship of the Ring

Begin with the standard and encounter deck for the Breaking of the Fellowship scenario.

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

4x Uruk-hai Archer

2x River Anduin

1x Slopes of Amon Hen

2x Black Feathered Arrows

Then, shuffle the encounter cards in this Nightmare Deck into the remainder of the standard Breaking of the Fellowship 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.