Storm dragon

Storm dragons were a type of dragon.

Description
Storm dragons had snake-like bodies with deep purple scales and broad wings. Their heads were broad and flat, with a long, sharp-angled snout and a series of horns and ridges extending back from the jaw, cheeks, and forehead. Their eyes crackled with lightning.

Habitat/Society
Storm dragons often competed for territory with blue dragons, and thus did not get along.

Trivia
While Draconomicon: Chromatic Dragons stated that storm dragon was another name for blue dragons, the description of Tekthyrios in The Gossamer Plain does not fit with that of a blue dragon, and The Fractured Sky explicitly calls them out as being different types of dragon. Despite this, storm dragons do not appear in any other novels or sourcebooks.