Red dragons are the largest, most powerful, and most (in)famous of the classic chromatic dragons. Physically, they are distinguished by their enormous size and wingspan. They have two large horns upon their heads, which point backwards towards their wings. They smell of smoke and sulphur.
The eggs of a red dragon must be kept in open flame at all times while incubating. Incubation takes approximately 660 days. After the eggs are laid, the younger of the two parents (either male or female) will remain behind to guard the eggs and keep their nest of flames burning. Once they hatch, the wyrmlings are left to fend for themselves. They usually have little problem in doing so. A red wyrmling is highly dangerous, being approximately the size of a human at hatching. They are fully capable of breathing fire, and revel in wreaking destruction and havoc on almost anything that moves. The latter trait is carried fully into adulthood.
They regard all other Chromatic dragons as inferiors, with the exact amount of disdain being proportional to the variety's general power level. When a Red Dragon and a White cross paths, the Red generally allows the white to sulk out of sight and out of mind, as they do not consider them as worth the effort to kill.
Red dragons have an amazing eye for value, and can determine the monetary worth of absolutely any material object at a glance. All dragons are known for hoarding treasure, but the red dragon far surpasses all other species in this regard. The gaining and keeping of treasure is the complete focus of a red dragon's adult life, and they tend to amass incredible hoards with amazing rapidity. At any given moment, a red dragon will be able to tell you the precise monetary value of all the objects in its hoard, down to the last fraction of a coin.
The preferred home for a red dragon is (naturally) inside an active volcano. If a volcano is not available, however, they will reside in any mountain, provided that it has a good ledge from which the dragon can survey its territory. A red dragon's lair will (surprisingly) often have only one entrance, which will be very high above ground level. The entrance leads to a narrow tunnel, which drops off into a steep pit. At the bottom of the pit lies a pool of water, surrounded by several chambers. One chamber will typically be the dragon's sleeping quarters, while the other will contain its hoard.
In combat, red dragons are exceptionally dangerous. Proficient in magic, they are also very fast in the air, but somewhat clumsy, so they prefer to do their fighting on the ground. They often spend years designing battle strategies, and will wait patiently until the precisely best moment to call upon them. Their massive blasts of fire end most battles before they truly begin, however. As a result, red dragons will use their powerful breath weapons as their favored method of attack, followed by power strikes from their massively powerful bodies, followed by magical attacks.
Many red dragons hoard women and children in their lairs, along with their wealth. In some genres they have the 'power of persuasion', which means they can get someone to do anything, as long as the opponent's mind is weaker than the dragon's. As a result, they often convince the chieftains of villages outside their volcanoes to give them sacrifices of young girls.