Arwen got to Ostagar pretty easily after having helped Jowan escape. Nothing could really be done in the origin story other than kill the spirit of valor and a bunch of spiders in the vault thingy. In the main Ostagar area there isn't really all that much to kill aside from the dog, however if I was to kill it, I would only end up with 2 companions for the final mission. I flipped a coin to decide the dog's fate and got heads, which meant I would keep it, but if you do intend of getting the highest kill count, taking it out manually is the way to go. According to the keep, there's also a prisoner you can execute, but I've never seen him before and I didn't find him this time so I missed out on the kill. Make sure you get him too to eliminate everyone.
After flexing to Wynne about passing the harrowing, Arwen made her way to Alistair and was promptly a dick to him as to not get attached before he gets tossed to the wolves in the landsmeet (it is a stuggle, I love him so much). He takes it like a champ and goes to collect the other recruits, then everyone collectively just gets sent to the wilds. Arwen promptly kills the dying soldier in the wilds, adding to her kill count.
The rest of the wilds search went normally, as well as the joining, since nothing can really be done that's particularly murderous. Passing through the tower of Ishal, the only difference to usual is that I went through every room in the tower to clear out the darkspawn, then let the game proceed as usual.
Lothering is the next stop in our journey.