Morgause's Fortress is one of the bases in which Morgause resided and practiced magic, such as scyring and resurrecting the dead, or creating illusions of the dead. It appears in only one episode. Guided by Arthur's enchanted horse, Arthur and Merlin had to cross a lake and a waterfall to reach it. It was in a courtyard of the Castle within which Morgause challenged Arthur. She asked him to put his head on the block and pretended to let the axe she was holding falling on his neck. She tested if Arthur was truly a man of his word and to reward his courage and honesty, she granted him to see his mother and talk to her. Then he learned the truth about his birth (The Sins of the Father).