Speak with Arl Eamon and then head to the second floor. The first room on the right has a locked chest containing a Map of Occupied Ferelden and at the end of the hall is Riordan. Learn the truth behind the Archdemon and the meaning of being a Grey Warden. Head to your room to find Morrigan waiting for you. You can accept her offer to earn a definite ending scenario or refuse and she leaves your party forever unfortunately.

You are taken to the Denerim City Gates after the cutscenes. Most enemies should die in a single blow so run around and kill them all. When they are all dead the quest updates so speak with Riordan. Now you must split your party in two and you might want to take Alistair/Loghain with you to enter the city. Start off by heading to the Market District.

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There are quite a few Ogres to kill here. The General itself is pretty tough.

Defeat the Ogres and press onward to the back side of the district. Check the rubble at the northern side, then the barrel on the other side of the building. At the southeastern end you will find more Ogres and the Hurlock General. Let it come out to you then sleep/paralyze/freeze the attacking Ogres and pummel the General. It drops several good items including Corruption and Axe of the Vashoth . Loot the rubble from where the General was and another in the northeast corner from there. Return to the city map and go to the alienage.