Warcraft: The Last Guardian

Blurb

Warcraft: The Last Guardian is a novel by Jeff Grubb set in the Warcraft Universe. It is considered to be the third novel, despite the e-book Warcraft: Of Blood and Honor being released first.
The story of Warcraft: The Last Guardian is about Medivh, the last guardian of Azeroth, his new apprentice Khadgar, and Medivh's fall from grace during the events of the First War.