Brother Muran is in the abbey proper, inside the curtain wall. On the way to the gate, the Vestige will meet Sister Safia, who will give the quest "Fire in the Fields," and Falice Menoit, who will give the quest "Injured Spirit Wardens." Fire in the Fields is required for the next quest.
Abbot Durak is away seeking a way to put out the largest fire.
Though the Omen of Fear has been dealt with and Alcaire is free of its influence, Duke Nathaniel is concerned. He's asked me to go seek the counsel of a Spirit Warden named Muran to see if he can explain what happened.