At 2d25, the sleeping gas can do serious enough damage to catch some adventurers unprepared, allowing them to close in and begin attacking mercilessly.
Many souvenir hunters #name the Nazgul's rings and attempt to ascend with a set of all nine.
In UnNetHack, SpliceHack, xNetHack, and EvilHack, Nazgul will attack any hobbits they see, and vice versa, as part of Nephi's grudge patch. Additionally in UnNetHack, a player killed by a Nazgul will arise as a barrow wight if a bones file is created.
SporkHack, EvilHack, SpliceHack, and UnNetHack implement a screaming attack for Nazgul. The range is limited, but causes its target to be stunned. Additionally, in EvilHack this attack has a chance to shatter any glass objects in open inventory that have not been fixed.
In EvilHack and SpliceHack, Nazgul ride steeds known as fell beasts, which are dangerous creatures in their own right.
Immediately, though everything else remained as before, dim
and dark, the shapes became terribly clear. He was able to
see beneath their black wrappings. There were five tall
figures: two standing on the lip of the dell, three advancing.
In their white faces burned keen and merciless eyes; under
their mantles were long grey robes; upon their grey hairs
were helms of silver; in their haggard hands were swords of
steel. Their eyes fell on him and pierced him, as they
rushed towards him. Desperate, he drew his own sword, and
it seemed to him that it flickered red, as if it was a
firebrand. Two of the figures halted. The third was taller
than the others: his hair was long and gleaming and on his
helm was a crown. In one hand he held a long sword, and in
the other a knife; both the knife and the hand that held it
glowed with a pale light. He sprang forward and bore down