Dragon

Dragons were very powerful and magical creatures. There were several types of dragons, the most common of which were chromatic and metallic, which were evil and good respectively. They were an ancient race. Few species that still exist can claim longer lineage. In recent times, the dragons were nearly all living free in Fris, or at the very least deceptive to their true nature, living amongst other species in polymorphed form.
The draconic family was vast. It consisted of numerous types of dragons, as well as lesser creatures related to dragons or descended from them.
True Dragons The term "true dragon" referred to dragons that became more powerful as they aged.
Chromatic Dragon were inherently evil. With the advent of the Cult of the Dragon many chromatic dragons were tempted to become dracoliches.
Metallic Dragon were inherently good. They often were found helping others.
Gem Dragon were aloof and self-centered, keeping to themselves and remaining neutral. They spent most of their time on the Inner Planes.
Dragons were inherently magical beings, and in no case should dragons be considered reptiles, despite obvious similarities such as a scaled epidermis and reproduction by laying eggs. In fact, they were more akin to feline creatures than reptiles, particularly in regards to their posture and movements, as well as being inherently warm-blooded and an eye composition similar to felines, although far more complex. A good example of this was the placement of the legs: dragons also tended to place their rear foot where their front foot was previously, much like most stalking feline predators.
Diet All dragons were omnivorous and could eat almost anything, thanks to their innate elemental nature that allowed them to consume and digest all sorts of food, including substances that wouldn't qualify as food to other living creatures. Most dragons preferred a carnivorous diet, but a few of them had developing unique dietary habits. Metallic dragons, for instance, preferred to eat primarily inorganic fare. Although they were true apex predators, dragons were not above scavenging for food if necessary.
Most dragons usually consumed half their own weight in meat every day. Dragons seldom got fat, as their bodies converted all the eaten food into elemental energy, storing it for later use. Much of this stored energy was expended using their breath weapons and when their bodies changed because of them advancing in age. When eating inorganic materials, dragons needed to eat as much as its own body weight per day to maintain healthy bodies.
In some instances, dragons also ate magic items. These instances were rare however. While dragons could "inherit" the magical properties of some magic items for a day or so, and as such this would had some tactical value, few dragons would resort to do such a thing unless they were starving to the point of death.
Reproduction The number of eggs a dragon laid each brood depended on its race, but was usually low, between one and ten. Evil dragons of adult age often laid and abandoned clutches of eggs, leaving the wyrmlings to work together to raise themselves until they were old enough to go their seperate ways. Good dragons of adult age, and some more intelligent evil dragons, would form families consisting of the mated pair and their offspring. The children generally left the family by the time they reached young adulthood. As dragon couples got older, they became increasingly likely to split apart as the desire for treasure began to outweigh interests in families. Older dragons would continue to mate, but would assign a single parent to the duty of raising the offspring.
Thanks to their shape-shifting, dragons could also cross-breed with virtually any other creature, creating a half-dragon. The most commonly heard of were in the humanoid races, particularly with human and elves. Any combination was possible, however, even with devils or angels. Most of the time when dragons of different types crossbred it resulted in no offspring. Whenever offspring did occur between different types, the offspring's biology would almost always favor one of the parent's "type" over the other and might display characteristic that varied from its norm. In very rare instances of crossbreeding yielding offspring, the resulting child's biology might favor neither parent. This might result in them being born as a new type or with albinism.
Senses As for their senses, which varied slightly depending on the species, dragons were superior in most ways to other creatures - like any predator, they had exceptionally acute senses, which only increased with age. Dragons had excellent depth perception and comparably good peripheral vision, able to see twice as well as a human in daylight; they had great night vision, and were able to see even when conditions had no light to offer, though not in color. Dragons could also pick up scents very well, utilizing both their sensitive nose and forked tongue, much like a snake. Their hearing was on par with human hearing, although their minds could filter what noise it hears. Dragon taste was also refined, although they did not respond well to sweet flavors, and most dragons didn't discuss why. They were able to eat almost everything, but each race had a preferred diet; some preferred flesh, other to eat precious metals or gems, and so forth. Of all its senses, a dragon's sense of touch is the only one to decrease with age, due mostly to the development of thick, hard scales.
Dragons were capable of blindsense, the sense in which eyes, ears, and other senses were used to detect invisible persons or objects.
Abilities Dragons became stronger as they grew older; they also became larger, more resistant to damages and magic, had a more dangerous breath, and a great deal of other enhanced aspects. Older dragons could cast draconic magic, such as spells with just a few words, and oftentimes they didn't need long and complex ritual involving words, gestures and components like other wizards, and they radiated a mystical fear aura around themselves. After a millennium or two, a dragon reached his maximum development.
All dragons had some innate magical abilities, but they varied from race to race. Metallic dragons were often able to shapechange into small animals or human forms, and used this ability to secretly help or watch over humans. Dragons also had some innate powers upon the element they are linked to. For example a red dragon, who breathed fire, had some control over other flame.
Society Hoards All dragons were inherently territorial and covetous. They hoarded wealth—although "wealth" could mean different things to different dragons—and jealously protected their hoards. For most dragons, there was no such thing as enough treasure. They enjoyed collecting mountains of gold, gems, coins, and magic items. They found these treasures radiant and enticing, and would make nooks and beds for themselves in their money piles. The habit of sleeping on their wealth meant that most great wyrms had hundreds of coins and gems embedded in their hides.
Evil dragons are quick to attack anyone they perceive as a threat to their hoard, even other dragons. Good dragons are more likely to attempt diplomacy, but their desire to protect their hoard is no less intense.
Religion Dragons worshiped Bahamut or Tiamat. The pantheon once included many other deities, forgotten after millennia of time, countless holy wars, and the deaths of all their living worshipers. Some dragons had even taken to worshiping human deities under different aspects.

Genetic Descendants

• Dragonborn