Re: "Keeping the Darkspawn Down" bugged

The quest isn't that important, as far as I can remember, you might just have to put up with it being uncompleted in your journal. Unless you can find some way to use the save editor to change the state of the quest (not sure if that's even possible, http://daitools.freeforums.org/ would be the place to ask), I can't think of any other solution other than reloading an older save. Weird bugs like this happen, it's a pain, but can't be helped.