The quest will complete as soon as you deal with Rath'Adran.
After the quest is complete, in order to receive your reward, go to The Thundering Steppes and speak to Scholar Milnik on the docks, at ( -550, -16, -430 ) Copy/waypoint -550, -16.45, -430.
Rewards[]
Nothing directly for completion, however, return to The Thundering Steppes, and speak with Scholar Milnik and he will offer you a choice of one of the following: