Brown Dragon

Brown dragons, also known as sand dragons or great desert dragons, were ferocious dragons that lived under the desert sands. They had sand colored scales, though unlike other types of dragon their scales were leathery. They had small webbed claws and very large, long mouths. Unlike most other types of dragons, they were wingless. To make up for this, they are the most adept diggers, speeding under loose sand very fast.
Brown dragons were both ferocious and intelligent. They were not particularly friendly or talkative, and this was mostly due to the fact that they considered most other creatures to be food, including members of intelligent races, and the idea of talking to their food was silly to them.
A brown dragon's breath weapon was a line of acid, which reduced most animals to little more than sand and dust. Brown dragons were also born with an immunity to acid and the effects of desert heat. They could even survive indefinitely in an airless environment.
In terms of senses, brown dragons had the ability to detect vibrations in the ground in order to detect approaching prey. Their eyes could see in areas of both low-light and total darkness.
Young brown dragons had the ability to cast create sand once per day, allowing them to cover up their burrows, while juveniles could create water once per day.
Additionally, older and more powerful brown dragons gained a certain amount of power over air. They gained the ability to whip up a vortex-like sandstorms and summon once per day either powerful air elementals or a powerful earth elemental. Older brown dragons also used illusions or invisibility spells to conceal themselves from unsuspecting prey.
Great wyrms, the oldest of brown dragons, could innately cast the disintegrate spell.