Easy Way to Level Up. In Ostargar during the mission Tainted Blood you are asked to collect three vials of Darkspawn Blood and the Grey Warden Treaties. Collect the three Vials of Darkspawn Blood first before the Treaties and than return to the main camp where you will talk to Duncan. Choose the choice option "We have the blood, but not the scrolls." On exiting the conversation you will collect experience for the mission and can contine to collect experience for this quest by continually talking to Duncan. Once you collect the Treaties you can no longer exploit Duncan for experience. This is an easy way to level up early if you need to.