The Dragons of Our World

Dragons are, I think, the most majestic and deadly creatures that the gods have ever seen fit to create. There have never been very many -- even ancient Morlu texts ponder their rarity. This rarity, combined with their immense power and knowledge have made them nearly equal to gods to many of the lesser mortals that share the world with them.
The mere fact of their low population, to a keen student of druidry, is a cause for amazement. Such dominant carnivores, an astute student shall surely know, are free to reproduce as wild hares. Of course, more ordinary carnivores are limited by constraints on food, space, and shelter -- and some druids believe that this could contribute to the low population of the dragons, but that is purely rubbish. Point me towards a dragon that would not kill another of its own kind to take its home or food, and I shall point you towards a rabbit that hunts wolves! No, I firmly believe that there must be some divine hand in their regulation.
There are many colors of dragon; I theorize that they are yet to be all accounted for. Many know the common colors: fiery red, freezing blue, poisonous green, bronze for time, and silver for the arcane (called the five principle colors by most scholars). Only druids and scholars will know more colors than the principles, usually. Many years ago, I came across a rather large tome, "On the Colours of the Dragons," by the most knowledgeable Orva Din, that I should recommend to the curious reader.
A single dragon is typically capable of great destruction, though several have been killed in the centuries following the War. Dragons usually keep to themselves, though few are known to be quite sociable. Two particular dragons that I have had the pleasure of treating with come to mind: Morzamu, the emerald king of southwestern Kolburra, and Sabahg the friendly of the Southern Draconic Empire. Morzamu is said to be quite fond of his orcish "children," and is enamored with their simple lifestyle. Sabahg, for his part, is surely the most pleasant of the six dragon lords of the Draconic Empire, although his temper is as fiery as his scales. His endless stories of old and deluge of wisdom is enough to keep even the sharpest mind entertained for all time. I should very much recommend offering a sacrifice to either of these titans (they tend to be more receptive to audiences after a good meal).
On the topic of good meals, these giants need surprisingly little to survive. A hunt typically occurs once every fortnight, with most dragons altering their hunting patterns so as to avoid non-prey creatures as much as possible. Lesser mortals are often completely unaware of the prowling dragon, as they are incredibly quiet for beasts of their size. Whether this silence is due to some magical cantrip or some divine gift I know not, but it ensures that hunting is seldom a challenge for this formidable creature.
Although, some dragons need not exercise their hunting skill at all these days. A few are fed entirely by sacrifice (quite a way to live, if I say so myself). The lesser beings that worship them will offer up livestock or captured wild beasts in exchange for protection or wisdom or wealth or some other gift they believe that the dragon can give (whether or not this is actually granted is an entirely different matter). The prime example of such practices is, of course, the Southern Draconic Empire. The six Great Ones are wholly worshipped by the collective population of southern Galzhür, and are sustained entirely by the same population's sacrifices.
I should again refer you to a more qualified student of dracology for more details on dragons, but as this is but a general guide to Ultor, I shan't be going into much more detail here.