Board Thread:Suggestions Forum/@comment-26084755-20150228115739/@comment-26084755-20150228130610

Yes the ring only answers to one master (Sauron) BUT normal people can use it to turn invisible.

As nazguls are a planned feature this would fit in actually. Cause if you wear the ring (and turn invisible) you are hidding from normal things but you will glow like a beacon in the unseen world.

That would be a way that nazguls can find you realy quick. just like in the films.