Forced: After Reeking Moat becomes the active location, choose a non-unique, non-Nazgûl enemy in the staging area and place it facedown under Reeking Moat.

Forced: When Reeking Moat leaves play, put each enemy under it into play engaged w

...towards Mordor lay like a moat a great mire of reeking mud and foul-smelling pools.

-The Return of the King