The Dead are Following
The Flame of the West#65 (x1)
3A-B (5)
When Revealed: Add The Stone of Erech and Army of the Dead (enemy side faceup) to the staging area. Each player may raise his threat by 3 to detach Overcome by Fear from his threat dial and set it aside, out of play.

"I see shapes of Men and of horses, and pale banners like shreds of cloud, and spears like winter-thickets on a misty night. The Dead are following." -Legolas, The Return of the King
While Stone of Erech is the active location, each Oathbreaker enemy loses the Phantom keyword and gets -20 engagement cost.

When The Stone of Erech leaves play as an explored location, the players win the game.

"Yes, the Dead ride behind. They have been summoned." -Elladan, The Return of the King