Jazereth is a powerful sorcerer who was also involved with Aidan and Moreina in killing Diablo. He is a Vizjerei mage and another body guard for Prince Aidan. He only shows up briefly to whisk away Aidan and Moreina back to Tristram upon the news of King Leoric's death. (Thus starting the Darkening of Tristram) 

Voice Notes: Nigerian accent isn't necessary, but he has that rugged commanding tone behind him. So whenever you hear his voice, you know this isn't a dude to mess with. (Not all spell casters are squishy)