Ancalagon the Black

[Morthoron]

Originally Posted by Aster

And were Nazgûl really less powerful than the Istari? If so, it is strange that Gandalph, for example, never really attempted to destroy them... You may say that he was forbidden to use greatest part of his power - yet he used it against Balrog...

Gandalf was forbidden to match power against power versus Sauron. The Balrog was not in Sauron's control, and was out of the ken of all the Fellowship but Gandalf; therefore, in order to assure the Fellowship continued their quest, Gandalf alone met this danger from the 1st Age.