Dragons are extremely powerful beings. and they Elements. they represent the Elements, the Elemental world. Each has specific ablilities according to their color. This one represents Fire and it's realm.
Brigida The Foul. She was one of the rare White Dragonwitches and feared—for good reason—throughout the Southlands and beyond. Everyone, even the Cadwaladrs, kept waiting for her to die . but she simply wouldn’t. (A Tale of Two Dragons)