The Fifth Blight will leave no life untouched, least of all Orion Cousland whose entire world will be shattered by corruption, betrayal, and hardship. It will be others, broken just as she is, that will help her heal not only herself but the rift dividing Ferelden. (Novelization of DA:O)

The Hero of Ferelden has gone off on a quest of her own during the Breach: to find a cure to the Calling. What she had not understood upon taking up this quest was that Corypheus would not suffer even an unknowing rival.