Dragons and Winged Beasts ridden by Ringwraiths
Smaug™
LOTR Dragon
LOTR Cave Drake
The Fiend Factory FF4 Wraith on Winged Mount wasn't a "Lord of The Rings" licensed piece, the rest were.
FF4 v2 Wraith on Winged Mount
BME2 Nazgul on Winged Beast
LOTR Ringwraith on Fell Beast
LOTR Witchking on Fellbeast
LOTR Winged Nazgul