Warg of Carn Dûm
The Siege of Annúminas#24 (x3)
Enemy
(20) 1 2 1 2

Forced: After Warg of Carn Dûm engages you, either remove 1 progress from the main quest, or exhaust a character you control.

Up from the dark plain below came the crying of fell voices, and the howling of many wolves
-The Fellowship of the Ring