"The Lord of the Rings" calls them Sauron's "most terrible servants". Their leader had been the King of Angmar, and their main stronghold was the city of Minas Morgul at the entrance to Sauron's realm, Mordor. They dress entirely in black; in their early forays they ride on black horses, but later they ride flying monsters, which Tolkien later described as "pterodactylic". Their main weapon is terror, though in their pursuit of the Ring-bearer Frodo, their leader uses a Morgul-knife which would reduce its victim to a wraith, and they carry ordinary swords. In his final battle, the Lord of the Nazgûl attacks Éowyn with a mace. The hobbit Merry stabs him with an ancient enchanted Númenórean blade, allowing Éowyn to kill him with her sword.