Dragons are heavily armored with scales and are extremely tough. However, most dragons are unarmored on their underside and have a week spot where the neck meets the head. Below is an average Great Dragon template. Actual dragons may very. They often rest in deep caverns, ruined castles, or the collapsing tunnels from the old dwarven Kingdom of Stone.
Thunder dragons are land dragons, incapable of flight.
They walk on all fours, and have the appearance of a brontosaurus. They are not overwhelmingly large, but are still quit big, measuring twenty to thirty meters from end to end and massing ten to twenty tons. Thunder dragons do little more than lay around and sleep, and rarely cause a problem unless their domain is intruded upon. Even so, Thunder dragons occasionally go in search of a mate or a new home, and a wandering thunder dragon is a creature best to be avoided. Thunder dragons do avoid cities, but they some times stumble across a village, the effects of which can be catastrophic.