Dragons are monsters, large, winged reptiles that breathe out fire and smoke. Apparently fairly common in the old days, the species encountered a little problem in the form of Dimwit Flathead, who took it into his head to hold a feast on the meat of 300 slaughtered dragons.
Since that event, there has been only one reported dragon-sighting, underground in the Eastlands in 948 GUE. The Legend of Wishbringer, tells of a dragon called Thermofax that had an appetite for careless knights. Although quite intelligent, dragons are also notoriously naive, this being clearly demonstrated by the fact that the dragon found in 948 was killed when it was startled by its own reflection.