The subject of this article originates from non-canonical sources. To find out about what is considered "canon" see LOTR:Canon.
The Dwimmerlaik was possibly the most mysterious of all the Nazgûl, for scant record of his past deeds exist in the tomes of the Wise. Yet in Rohan, this particular Ringwraith is feared beyond all others, for he has been a blight upon that realm for centuries untold, directing the Dark Lord's minions against the Sons of Eorl. His weapons include a dark staff and a sword. He is also the greatest of them all, and owns a Morgul blade.