Fell Beast
The Flame of the West #57 (x2/x1)
Treachery
Morgul.  

Surge.

When Revealed: Attach to a Nazgûl enemy. Limit 1 per enemy. (Counts as a Mount attachment with the text: "Attached enemy gets +1 Threat +1 Attack +1 Defense and -10 engagement cost.Forced: At the end of the round, return attached enemy to the staging area.

...horrible as carrion–fowl yet greater than eagles, cruel as death. –The Return of the King