Can be attained once level 25 is reached.
Quick walk through Guide:*** Spoiler - click to reveal ***You will need to speak to an undead minion who will appear. He will ask you to go to one of the following locations based on your Dominion:
Aldmeri Dominion
Vulkhel Guard Mages Guildhall
Daggerfall Covenan
Daggerfall Mages Guildhall
Ebonheart Pact
Davon's Watch Mages Guildhall
Rewards: