Magic Without Honor
After arriving in Pinnacle, you will see a bunch of people by a fire.
These people are the mage guild. They have been exiled because some corrupt mages destroyed magic's image. Agree to help them with their problem and hunt down the deviants.
All the targets you need are located in the quest "Bastille Day"
Just kill the mages in here to complete this quest.
When the corrupt mages have been dealt with, return to the Archon.
Speak to her to give her the good news and to complete the side-quest.