'Offered and Lost' is one of the last Act 2, and thus overall, main story quests in Dragon Age 2. By now Hawke is probably pretty badass for you, but in case you need some help or just want to see someone really good get it done watch this video walkthrough of the quest. Check below for tips from the video creator and a guide to the content of each of the three video segments.
From the Creator
This video begins with the cutscene of Seneschal Bran
1. Travel to Viscount's Keep and speak with Seneschal Bran
2. Go to the Hanged man (night) and talk to Orwald the Braggart
3. Travel to the Chauntry
4. Defeat the enemy Patrons.
This video begins with the cutscene of Hawke speaking with Sister Patrice
5. Go to Chantry
6. Go to Ser Varnell's Refuge
7. When you arrive set your party up for a big battle. Cone of Cold and Chain Lightning will work great
This video ends with the player encountering Ser Varnell
This video begins with the cutscene Of Ser Vanell killing the Qunari, just before the final battle of the quest.
8. Go to Ser Varnell's Refuge
9. In this battle use chain lightning to damage large groups of Fanatics
10. Pay close attention to your party's; health, mana, and stamina.
11. After beating Varnell, make sure to grab the shield that he drops, it is pretty good.