In the beginning of the game "Duncan" will tell you to go into the "Wilds" and retrieve 3 vials of "Darkspawn Blood" and to look for "magically sealed" treaties.

You need to go into the wilds and retrieve the vials of blood, but do not get the treaties.

When you have the blood and not the treaties go talk to Duncan again, he will ask you if you have the blood and the treaties, you will say I have the vials of blood, but not the treaties.

This will give you the experience of the mission and you can do this until you are done with the glitch or you can go all the way to level 25.