Uruloki

An Uruloki is a great fire dragon in the time of the Lord of the Rings. It was confirmed by Tolkien in a letter that Samug was the last of the kind, but other dragons of lesser stature lived on.

These creatures are described by Tolkien as being more like giant scaled serpents with wings, and often growing to immense size.

The fire from one of these dragons were so intense that it was said that the great dragons could consume and melt the Rings of power, but not the one ring.

Uruloki include Ancalagon (the black), Glaurang (the worm) and Smaug (the golden).