Our Warcraft fanatic colleagues at IGN Benelux had a chance to interview the Warcraft Cast: http://www.battle-chat.com/warcraft-cast-interview-anduin-lothar-and-orgrim-doomhammer-talk-about-wow-and-spells/
Tarecgosa was a member of the Blue Dragonflight, with her blue-and-white scales. However, she also has a human form. In the game World of Warcraft through a sacrifice, she saves Kalecgros. In doing this she allows the player to attend the dragon council, and her essence is bonded with Dragonwrath, Tarecgosa’s Rest, a legendary caster staff.