There is a dragoness in Adela known as Kassir'a. She has a nasty temper and doesn't allow any of the riders near her. She sleeps apart from other dragons and has a wolf for an adopted son and companion. She can be found anywhere in Adela, but will be waiting just outside the Serha Plains. Meet her there. All will be revealed. If you cannot meet her in person for whatever reason, send a letter (magical means will probably work best) and correspondence will be established.