Who is Irian (Orm Irian) from The Other Wind and what is their importance?

Orm Irian is a woman who can turn into a dragon and one of the daughters of Kalessin the Eldest dragon. She was the only woman to ever be schooled at Roke by the Master Patterner, the Master Herbal, the Namer and the Doorkeeper. Orm Irian is described as a tall, strong woman of strikingly good looks, who deals with other people in a friendly but powerful way.