Sir Juncan was a member of the Knights of the Nine. He was one of the knights that found the body of Sir Henrik after he failed to recover the Mace of the Crusader, a quest he refused to help in while he looked for the Boots of the Crusader. He later discovered that boots where needed to get the Mace, and he blamed himself for the death of his friend. Juncan died of unknown causes while searching for the Boots.
Sir Juncan was able to stay out of the War of the Red Diamond, and believed that it was the knights getting into the wars of man that destroyed them.
His spirit is first encountered by the Hero while he is looking for the Cuirass of the Crusader in the undercroft of the Priory of the Nine. If the Hero succeeds in his fight against Juncan and the other Knights, he will assist the Hero in finding the Relics, in particular the Boots. He will then point the Hero to a Shrine of Kynareth, where he would be able to obtain the Boots.
While searching for the Boots, the Knight Commander must speak to the worshipers at the shrine, who will lead the Knight to the Grove of Trials outside the cave Kynareth's Grotto. If the trial is failed, they must be spoken to again to try again.
After receiving The Blessing of Talos and the promoting of Knights, it is time to face Umaril the Unfeathered at Garlas Malatar. The Prophet has marked the keep where he is hiding.