It has something to do with the Blight. They are terribly secretive as a whole- I am certain I should not know even that but Alistair was kind enough to inform me after I expressed my displeasure at his instance that whatever it was they did saved a man that was on his death's bed. My friend. He was dying of the blight and then, suddenly, he wasn't.

[ And they will not tell her how. ]

The song- means the taint is thick in them. Apparently it is custom for them to go to the deep roads and fight as many darkspawn until they themselves die or- something like that? I think it is bullshit, I do not trust it, I do not understand it but- whatever This Calling is. Whatever it means to them? It has stopped.