You are playing Nightmare mode.

"If simple folk are free from care and fear, simple they will be, and we must be secret to keep them so."
–Aragorn, The Fellowship of the Ring

Begin with the standard quest deck and encounter deck for the Intruders in Chetwood scenario.

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

1x Angmar Orc

3x Angmar Marauder

2x Chetwood Forest

1x Outlying Homestead

2x Borders of Bree-land

1x Rugged Country

1x Shrouded Hills

3x Surprising Speed

2x Sudden Assault

Then, shuffle the encounter cards in this Nightmare Deck into the remainder of the standard Intruders in Chetwood 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.