SPOILERS for DA2:
In my opinion, the only good reason to side with the Templars is that it allowed you to become the Viscount of Kirkwall. Furthermore, if you were a female Hawk and romanced a rivaled Sebastian, you got a special bit of dialogue from him stating that a marriage between the leaders of Starkhaven and Kirkwall would be the most powerful alliance the Free Marches had ever seen. This is an awesome ending, especially if the Warden also became King/Queen of Fereldon.
I think a tile which mentions this should be put into the Keep. IT's kind of a huge deal.
This also shows why Friendship/Rivalry was such a big deal. If Sebastian was a friend he never become the Ruler of Starkhaven. If he was a rival he becomes the leader.





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