Legendary Pictures recently posted the Warcraft Movie Khadgar spotlight video where we see Khadgar spellcasting arcane and fire spells in all its glory. The video clip also shows these characters: King Llane, Garona, Lothar, Gul’dan and Durotan.
Each spotlight video has a description of each of the heroes. In this case, Khadgar is dubbed “The Seeker.” A mage is known to seek knowledge to hone and grow his magical skills. There is a scene where Khadgar is in the Karazhan library. The tower seen in one of the screenshots below is most definitely The Tower of Karazhan.