Dragon Age 2 - Following the Qun is a main plot quest, that will become available to you after completion of "All that Remains". For this walkthrough, players will attempt to reason with the Qunari leader (Arishok) to hand over Viscount's son, and then try to save him before it's too late.

1. Accept the letter from the Viscount at your desk, after you've completed the "All That Remains" quest.
   
2. Speak with the Viscount in Viscount's Keep.
3. Go to the Qunari Compound at the Docks and speak with the Arishok.
4. Go to the Chantry at night and speak with Petrice.
   
5. Take out the mob. They will be numerous, but weak.