Once dragons were commonplace and ruled the continent absolutely. Dragon fire was the bane of cities, and dragon appetite was a constant threat to the first colonizers. Sorcerers stood against these creatures witchers were created to fight them. Today dragons are nearly extinct. Sometimes forktails and slipzards can be seen, but compared to dragons, they are like stray cats to tigers. The beasts were exterminated by professional hunters, such as the famed Crinfrid Reavers. Alchemical components found in a dragon's body are among the most expensive on the market, and are in high demand among sorcerers. The beast's roasted tail is a real delicacy.
The legends are true: dragons like to gather hoards and have a voracious appetite that they satiate by eating all living creatures with no exceptions. Like cats, they like to lounge in places of power - they nap there, drawing energy, yet nobody knows what they use that energy for. There are five species of these great wyrms: white, black, red, green and rock. Golden dragons, extremely intelligent, gifted with the ability to assume the shape of any creature, are of course a fairy-tale for little children. Dragons are smart indeed, but they cannot speak, much less polymorph.
The best tactic when meeting a dragon is to pray to all the gods with no exceptions. Atheists should run - they can thus extend their lives for a few heartbeats. It must be stressed that any of these choices would end in death when made by an amateur. One fighting a dragon should watch out for it's fire above all else - the breath is lethal, momentarily ending the fight. The wyrms can also fly, and are excellent at maneuvering, so they use the advantage of altitude in combat. A witcher should climb high buildings to surprise the reptile flying by, and to use walls as protection. The beast's jaws are even worse than it's paws - they bring instant death. Dragons, like cats, like to toy with their prey, so they sometimes lift it to the air, and drop from height when they are bored.
Dragons are immune to poisons, unworried by oils which increase bleeding, and unaffected by traps or bombs. One would be hard pressed to find a soul brave enough to drop a dragon, unless it had been hacked to pieces with an axe first. And I wish such an outcome of the battle to all dragonslayers with all my heart.